Publications


Journal Publications

  1. Sujith Reddy Jaggannagari, Yixiang Gan, Ratna Kumar Annabattula* A comparative study of JKR and DMT contact models for the DEM simulation of powder spreading in additive manufacturing, Computational Particle Mechanics (accepted)
  2. Sujith Reddy Jaggannagari, Wen Hao Kan, Louis N.S. Chiu, Gwénaëlle Proust, Aijun Huang, Yixiang Gan, Ratna Kumar Annabattula* Numerical and experimental analysis of powder bed homogeneity through multi-layer spreading in additive manufacturing, Additive Manufacturing, 97, 104571 (2025)
  3. Venkata Rama Manoj Pola, Ratna Kumar Annabattula* Study of triaxial loading of segregated granular assemblies through experiments and DEM simulations, Granular Matter 26, 99 (2024)
  4. Rajan Aravind, Sundararajan Natarajan, Krishnankutty Jayakumar, Ratna Kumar Annabattula* A Non-Intrusive Stochastic Phase-Field Fatigue Fracture in Brtittle Materials with Uncertainity in Geometry and Material Properties, Computer Modeling in Engineering & Sciences 141, 997-1032 (2024)
  5. Shakti Swaroop Choudhury, Ratna Kumar Annabattula*, Murugaiyan Amirthalingam* A methodology for the development of functionally graded powder spreading in laser powder bed fusion process using discrete element method, Welding in the World 68, 2259 - 2269 (2024)
  6. Sanghamitra Debta, Pramod Kumbhar, Pijush Ghosh, Ratna Kumar Annabattula* Solvent Responsive Functionally Graded Hydrogel Thin Films for Programmed Actuation, ACS Applied Engineering Materials, 2(5), 1336 - 1347 (2024)
  7. Lansong Yue, Erik P. J. Ambergen, Sean J. D. Lugger, Akhil Reddy Peeketi, Ratna Kumar Annabattula, Albert P. H. J. Schenning*, Michael G. Debije*, Vacuum Thermoforming of Optically Switchable Liquid Crystalline Elastomer Spherical Actuators, Advanced Materials, 2402559, (2024)
  8. Akhil Reddy Peeketi, Edwin Joseph, Narasimhan Swaminathan*, Ratna Kumar Annabattula* Photo-activated dynamic isomerization induced large density changes in liquid crystal polymers: A molecular dynamics study, The Journal of Chemical Physics, 160, 104902 (2024)
  9. Sarnath Thoudam, Pramod Kumbhar, Anand Krishna Kanjarla*, Ratna Kumar Annabattula* Study of crack propagation in multi-phase composites embedded with both stiff and compliant particles using phase field method, Modelling and Simulation in Materials Science and Engineering, 32, 035019 (2024)
  10. Anirudh Chandramouli, Sri Datta Rapaka, Ratna Kumar Annabattula* Design of auxetic cellular structures for in-plane response through out-of-plane actuation of stimuli-responsive bridge films, Smart Materials and Structures, 33, 025009 (2024)
  11. Shahid Ansari, Ratna Kumar Annabattula*, Sathyan Subbiah Gravity-driven powder flow and the influence of external vibration on flow characteristics, Particuology, 88, 201-209 (2024)
  12. Deepak K. Pawar, Ratna Kumar Annabattula, Narasimhan Swaminathan Mesoscopic mechanics of triaxially compressed pebble assembly and estimation of Drucker-Prager parameters using Discrete Element Method, Computational Particle Mechanics 11, 885 - 901 (2024)
  13. Akhil Reddy Peeketi, Narasimhan Swaminathan*, Ratna Kumar Annabattula* Design of partially covered bilayer thin film actuators, Mechanics of Materials, 187, 104816 (2023)
  14. Rajan Aravind, K. Jayakumar, Ratna Kumar Annabattula* Probabilistic investigation into brittle fracture of functionally graded materials using phase-field method, Engineering Fracture Mechanics, 288, 109344 (2023)
  15. Divya Jayoti#, Akhil Reddy Peeketi#, Pamod Yallappa Kumbhar, Narasimhan Swaminathan, Ratna Kumar Annabattula* Geometry controlled oscillations in liquid crystal polymer films triggered by thermal feedback, ACS Applied Materials & Interfaces, 15, 18362 - 18371 (2023)
  16. Lekhana Chandran, Sri Datta Rapaka, K. Eswara Prasad* and Ratna Kumar Annabattula Modeling the failure of silicon carbide under high strain-rate compression: A parametric study, Materials Today: Proceedings, 87, 134 - 139 (2023)
  17. Akhil Reddy Peeketi, Jeroen A. H. P. Sol, Narasimhan Swaminathan, Albert P.H.J. Schenning, Michael G. Debije*, Ratna K. Annabattula* Call Lily flower inspired morphing of flat films to conical tubes, Journal of Polymer Science, 61, 1065-1073 (2023)
  18. Sanghamitra Debta, Pramod Kumbhar, Pijush Ghosh* and Ratna Kumar Annabattula* Anomalous temperature dependent stiffness evolution in hydrogels, Materials Letters, 327, 133016 (2022)
  19. Sri Datta Rapaka, Manoj Pandey* and Ratna Kumar Annabattula* Effect of combined gradation in cross-sectional area and density on the dynamic compressive behaviour of foams for moderate impact velocities, Mechanics of Materials, 172, 104381 (2022)
  20. Pramod Kumbhar, Narasimhan Swaminathan* and Ratna Kumar Annabattula* Mesoscale analysis of Li-ion battery microstructure using sequential coupling of discrete element and finite element method, International Journal of Energy Research, 46, 12003-12025 (2022)
  21. Haobin Liang, Jianlei Niua, Ratna KumarAnnabattula, K.S.Reddy, Ali Abbas, Minh Tri Luu, Yixiang Gan* Phase change material thermal energy storage design of packed bed units, Journal of Energy Storage, 51, 104576 (2022)
  22. Divya Jayoti, Akhil Reddy Peeketi Ratna Kumar Annabattula and S. Krishna Prasad* Dynamics of the photo-thermo-mechanical actuations in NIR-dye doped liquid crystal polymer networks, Soft Matter, 18, 3358-3368 (2022)
  23. Pramod Kumbhar, Deep Malu, Narasimhan Swaminathan* and Ratna Kumar Annabattula* An analytical study on the diffusion induced contact interactions between ellipsoidal electrode particles in lithium ion batteries, Journal of Power Sources 529, 231224 (2022)
  24. Rajesh Kumar Meena, Sri Datta Rapaka, Raghunandan Pratoori, Ratna Kumar Annabattula* and Pijush Ghosh* Embedded interface regulates underwater actuation of solvent-responsive soft grippers, Soft Matter, 18, 372-381 (2022)
  25. Raja Gopal Tangella, Pramod Kumbhar and Ratna Kumar Annabattula* Hybrid phase-field modeling of thermo-elastic crack propagation, International Journal for Computational Methods in Engineering Science and Mechanics, 23, 29-44 (2022)
  26. Marc del Pozo, Jeroen A. H. P. Sol, Stefan H. P. van Uden, Akhil R. Peeketi, Sean J. D. Lugger, Ratna K. Annabattula, Albert P. H. J. Schenning*, Michael G. Debije* Patterned Actuators via Direct Ink Writing of Liquid Crystals, ACS Applied Materials & Interfaces, 13, 59381-59391 (2021)
  27. Pratik Gujar, Hirshikesh Hirshikesh, Ratna Kumar Annabattula and Pijush Ghosh* Structural to interfacial fracture transition in epoxy coated hydrating cement, Construction and Building Materials, 310, 12518 (2021)
  28. Mayank Raj, Sanket Thakre, Ratna Kumar Annabattula* and Anand K Kanjarla* Estimation of local strain fields in two-phase elastic composite materials using U-Net based deep learning, Integrating Materials and Manufacturing Innovation, 10, 444-460 (2021)
  29. Adithya Ramgopal, Akhil Reddy Peeketi and Ratna Kumar Annabattula* Numerical analysis and design of light-driven liquid crystal polymer-based motorless miniature cart, Soft Matter, 17, 7714-7728 (2021)
  30. Sujith Reddy Jaggannagari, Raghuram Karthik Desu, Jörg Reimann, Yixiang Gan, Marigrazia Moscardini and Ratna Kumar Annabattula* DEM simulations of vibrated sphere packings in slender prismatic containers, Powder Technology, 393, 31-59 (2021)
  31. Sri Datta Rapaka, Manoj Pandey* and Ratna Kumar Annabattula* Theoretical analysis on the dynamic compressive behavior of cellular solids with non-linear variation in cross-sectional area, International Journal of Impact Engineering, 155, 103921 (2021)
  32. Akhil Reddy Peeketi, Narasimhan Swaminathan* and Ratna Kumar Annabattula* Modeling the combined photo-chemo/thermo-mechanical actuation in azobenzene-doped liquid crystal thin films, Journal of Applied Physics, 129, 145107 (2021)
  33. Akhil Vijayan and R. K. Annabattula* Semi-analytical framework for stress-conductivity correlations in periodic granular assemblies under compaction, International Journal of Advances in Engineering Sciences and Applied Mathematics, 13, 329-343 (2021)
  34. Mingrui Dong, Joerg Reimann, R. K. Annabattula and Yixiang Gan* Morphological Characterisation of 2D Packing with Bi-disperse Particles, International Journal of Advances in Engineering Sciences and Applied Mathematics, 13, 89-97 (2021)
  35. Sai Sharan Injeti, Nihit Vyas and R. K. Annabattula* Modified Stoney's equation with anisotropic substrates undergoing large deformations, Mechanics Research Communications, 113, 103685 (2021)
  36. Amudha Krishnan, Subrato Kumar Bhattacharya, Ratna Kumar Annabattula, Kutti Krishnan Gopkumar; Gidugu Ananda Ramadass An Experimental Investigation of the Behavior of Single-Particle Breakage on Polymetallic Nodules, Marine Technology Society Journal, 55, 93-107 (2021)
  37. Akhil Vijayan, Baju C. Joy and R. K. Annabattula* Fluid flow assisted mixing of binary granular beds using CFD-DEM, Powder Technology, 383, 183-197 (2021)
  38. Raghu Ram Karthik Desu, Yixiang Gan, Marc Kamlah and R. K. Annabattula* Compaction mechanics of a polydisperse crushable spherical granular assembly using discrete element method, International Journal of Advances in Engineering Sciences and Applied Mathematics, 13, 114-121 (2021)
  39. Raghunandan Pratoori, Rajesh Kumar Meena, Pijush Ghosh* and R. K. Annabattula* Coupled diffusion-deformation behaviour of stimuli-responsive thin polymer films, Mechanics of Materials, 152, 103648 (2021)
  40. Pratik Gujar, Hirshikesh, Manu Santhanam, Ratna Kumar Annabattula and Pijush Ghosh* Interfacial fracture behavior between cement paste and epoxy coating - An experimental and phase-field approach, RILEM Technical Letters, 5, 186-193 (2020)
  41. Marina Pilz da Cunha, Akhil R. Peeketi, Adithya Ramgopal, Ratna K. Annabattula and Albert P.H.J. Schenning* Light-driven continually oscillatory rocking of a polymer film, Chemistry Open 9, 1149 - 1152 (2020)
  42. Kanishk Mehta, Akhil Reddy Peeketi, Ling Liu, Dirk Broer, Patrick R. Onck* and R. K. Annabattula* Design and applications of light responsive liquid crystal polymer thin films, Applied Physics Reviews 7, 041306 (2020), AIP Scilight
  43. Sri Datta Rapaka, Manoj Pandey and R. K. Annabattula Dynamic compressive behaviour of auxetic and non-auxetic hexagonal honeycombs with entrapped gas, International Journal of Impact Engineering 146, 103718 (2020)
  44. Raghuram Karthik Desu, Akhil Reddy Peeketi and R. K. Annabattula Influence of bed conditions on the effective thermal conductivity of ceramic breeder pebble beds using thermal DEM (TDEM), Fusion Engineering and Design 159, 111767 (2020)
  45. V. Anju, R. Pratoori, D. Gupta, R. Joshi, R. K. Annabattula and P. Ghosh Controlled Shape Morphing of Solvent Free Thermoresponsive Soft Actuators, Soft Matter 16, 4162-4172 (2020)
  46. Kanishk Mehta, Akhil Reddy Peeketi, Jeroen A. H. P. Sol, Michael G. Debije, Patrick R. Onck and Ratna Kumar Annabattula Modeling of surface waves in photo-responsive viscoelastic liquid crystal thin films under a moving light source, Mechanics of Materials 147, 103388 (2020)
  47. Jagannadh Boddapati, Shaswat Mohanty and Ratna Kumar Annabattula An analytical model for shape morphing through combined bending and twisting in piezo composites, Mechanics of Materials 144, 103350 (2020)
  48. Akhil Vijayan, Yixiang Gan and Ratna Kumar Annabattula Evolution of fabric in spherical granular assemblies under the inuence of various loading conditions through DEM, Granular Matter, 22, 34 (2020)
  49. Veral Bhartia, Matthias Kolb, Marigrazia Moscardini, Marc Kamlah and Ratna Kumar Annabattula Elastic response of individual European advanced ceramic breeder pebbles during uniaxial compression, Fusion Engineering and Design 153, 111502 (2020)
  50. Shaswat Mohanty, Pramod Kumbhar, Narasimhan Swaminathan and Ratna Kumar Annabattula A phase-field model for crack growth in electro-mechanically coupled functionally graded piezo ceramics, Smart Materials and Structures, 29, 045005 (2020)
  51. Sundararajan Natarajan, Prasad Dharmadhikari, Ratna Kumar Annabattula, Junqi Zhang, Ean Tat Ooi and Chongmin Song, Extension of the scaled boundary finite element method to treat implicitly defined interfaces without enrichment, Computers and Structures, 229, 106159 (2020)
  52. Sri Datta Rapaka, Manoj Pandey and Ratna Kumar Annabattula, Effect of defects on the dynamic compressive behaviour of cellular solids, International Journal of Mechanical Sciences, 170, 105365 (2020)
  53. Pramod Kumbhar, Amrita Francis, Narasimhan Swaminathan, Ratna Kumar Annabattula and Sundararajan Natarajan, Development of User Element Routine (UEL) for cell based smoothed finite element method (CSFEM) in Abaqus, International Journal of Computational Methods, 17, 1850128 (2020)
  54. Akhil Vijayan and Ratna Kumar Annabattula Effect of particle flow dynamics on the fabric evolution in spherical granular assemblies filled under gravity, Powder Technology, 356, 909-919 (2019)
  55. Marina Pilz da Cunha, Akhil R. Peeketi, Kanishk Mehta, Dirk J. Broer, Ratna K. Annabattula, Albert P. H. J. Schenning and Michael G. Debije A self-sustained soft actuator able to rock and roll, Chemical Communications, 55, 11029 - 11032 (2019)
  56. Shaswat Mohanty, Pramod Kumbhar, Ratna K. Annabattula and Narasimhan Swaminathan Stress-electrochemistry interactions in a composite electrode for Li-ion batteries, Solid State Ionics 342, 115053 (2019)
  57. Akhil Reddy Peeketi, Marigrazia Moscardini, Simone Pupeschi, Yixiang Gan, Marc Kamlah and Ratna K. Annabattula Analytical estimation of the effective thermal conductivity of a granular bed in a stagnant gas including the Smoluchowski effect, Granular Matter, 21: 93 (2019)
  58. Akhil Reddy Peeketi, Raghuram Karthik Desu, Pramod Kumbhar and Ratna K. Annabattula Thermal analysis of large granular assemblies using a hierarchical approach coupling the macro-scale finite element method and micro-scale discrete element method through artificial neural networks, Computational Particle Mechanics, 6, 811-822 (2019)
  59. Hirshikesh, C. Jansari, K. Kannan R. K. Annabattula and S. Natarajan Adaptive phase field method for quasi-static brittle fracture using a recovery based error indicator and quadtree decomposition, Engineering Fracture Mechanics, 220, 106599 (2019)
  60. Hirshikesh, A. L. N. Pramod, Ratna K. Annabattula, E. T. Ooi, C. Song and S. Natarajan Adaptive phase-field modelling of brittle fracture using the scaled boundary finite element method, Computer Methods in Applied Mechanics and Engineering, 355, 284-307 (2019)
  61. Hirshikesh, Sundararajan Natarajan, Ratna K. Annabattula and Emilio Martinez-Paneda Phase field modelling of crak propagation in functionally graded materials, Composites Part B: Engineering, 169, 239-248 (2019)
  62. Raghuram Karthik Desu, Ratna Kumar Annabattula Particle size effects on the contact force distribution in compacted polydisperse granular assemblies, Granular Matter 21:29 (2019)
  63. Raghuram Karthik Desu, Akhil Reddy Peeketi, Ratna Kumar Annabattula Artificial neural-network based prediction of effective thermal conductivity of a granular bed in a gaseous environment, Computational Particle Mechanics, 6, 503-514 (2019)
  64. Jeroen A. H. P. Sol, Akhil R. Peeketi, Nihit Vyas, Albertus P. H. J. Schenning, Ratna K. Annabattula and Michael G. Debije, Butterfly proboscis-inspired tight rolling tapered soft actuators, Chemical Communications 55, 1726-1729 (2019)
  65. Hirshikesh, S. Natarajan and R.K. Annabattula, Modeling crack propagation in variable stiffness composite laminates using the phase field method, Composite Structures, 209, 424-433 (2019)
  66. S. Samanta, S.S. Nanthakumar, R.K. Annabattula and X. Zhuang, Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements, Frontiers of Structural and Civil Engineering, 13. 542-556 (2019)
  67. Hirshikesh, Sundararjan Natarajan and Ratna Kumar Annabattula, A FEniCS implementation of the phase field method for quasi-static brittle fracture, Frontiers of Structural and Civil Engineering, 13, 380-396 (2019)
  68. S. Mohanty, P. Kumbhar, N. Swaminathan and R.K. Annabattula, A finite strain based coupled chemo-mechanical study of the anode materials in lithium-ion batteries, Journal of Coupled systems and Multiscale Dynamics, 6, 266-271 (2018)
  69. Raghuram Karthik Desu, Paritosh Chaudhuri and Ratna Kumar Annabattula, High temperature chracterization of Li2TiO3 pebble beds for Indian TBM, Fusion Engineering and Design, 136, 945-949 (2018)
  70. Mohammed Suhail, Baldev Puliyeri, Paritosh Chaudhuri, Ratna Kumar Annabattula and Narasimhan Swaminathan, Molecular dynamics simulation of primary damage in β-Li2TiO3, Fusion Engineering and Design, 136, 914-919 (2018)
  71. Akhil Reddy Peeketi, Marigrazia Moscardini, Akhil Vijayan, Yixiang Gan, Marc Kamlah and Ratna Kumar Annabattula, Effective thermal conductivity of a compacted pebble bed in a stagnant gaseous environment: An analytical approach together with DEM, Fusion Engineering and Design, 130, 80-88 (2018)
  72. Raghuram Karthik Desu, Anand Moorthy and Ratna Kumar Annabattula, DEM simulation of packing mono-sized pebbles into prismatic containers through different filling strategies, Fusion Engineering and Design 127, 259-266 (2018)
  73. Joel Martis and Ratna Kumar Annabattula, A semi-analytical model for the effective thermal conductivity of a multi-component polydisperse granular bed, Granular Matter, 19:84 (2017)
  74. Hirshikesh, S. Natarajan, R. K. Annabattula, S. Bordas and E. Astroshchenko, Trefftz polygonal finite element for linear elasticity: convergence, accuracy and properties, Asia Pacific Journal on Computational Engineering, 4, 1-17 (2017)
  75. M. Moscardini, Y. Gan, R. K. Annabattula and M. Kamlah, A Discrete Element Method to simulate the mechanical behavior of ellipsoidal particles for fusion breeder blanket, Fusion Engineering and Design, 121, 22-31 (2017)
  76. S. Natarajan, Hirshikesh, N. Swaminathan and R. K. Annabattula, Effects of stress-diffusion interactions in an isotropic elastic medium in the presence of geometric discontinuities, Journal of Coupled Systems and Multiscale Dynamics, 4 (3), 1-11 (2016)
  77. Raghuram Karthik Desu, Yixiang Gan, Marc Kamlah and Ratna Kumar Annabattula, Mechanics of crushable binary pebble assembly thorugh Discrete Element Method, Nuclear Materials and Energy, 9, 237-241 (2016)
  78. Sai Sharan Injeti and Ratna Kumar Annabattula, Extending Stoney's equation to thin, elastically anisotropic substrates and bilayer films, Thin Solid Films, 598, 252-259 (2016)
  79. V. Iyer, A. Raj, R. K. Annabattula and A. K. Sen, Experimental and numerical studies of a microfluidic device with compliant chambers for flow stabilization, Journal of Micromechanics and Microengineering, 25, 075003 (2015)
  80. E. A. Flores-Johnson, L. Shen, R. K. Annabattula, P. R. Onck, Y. G. Shen and Z. Chen, The effect of interface adhesion on buckling and cracking of hard thin films, Applied Physics Letters, 106, 161912 (2014)
  81. R. K. Annabattula, M. Kolb, Y. Gan, R. Rolli and M. Kamlah, Size-dependent crush analysis of lithium orthosilicate pebbles, Fusion Science and Technology, 66, 136-141 (2014)
  82. Y. Gan*, F. Hernandez, D. Hanor, R. K. Annabattula, M. Kamlah and P. Pereslavtsev, A thermal discrete element analysis of EU solid breeder blanket subjected to neutron irradiation, Fusion Science and Technology, 66, 83-90 (2014)
  83. E. A. Flores-Johnson, L. Shen, R. K. Annabattula, P. R. Onck, Y. G. Shen and Z. Chen, Finite element modelling of stress-induced fracture in Ti-Si-N films, Applied Mechanics and Materials, 553, 10-15, (2014)
  84. F. Hernandez, M. Kolb, R. Annabattula and A. v.d. Weth, Construction of PREMUX and preliminary experimental results, as preparation for the HCPB breeder unit mock-up testing, Fusion Engineering and Design, 89, 1257-1262, (2014)
  85. R. K. Annabattula*, Y. Gan, S. Zhao and M. Kamlah, Mechanics of a crushable pebble assembly using discrete element method, Journal of Nuclear Materials, 430, 90-95, (2012)
  86. A. Ying*, J. Reimann, L. Boccaccini, M. Enoeda, M. Kamlah, R. Knitter, Y. Gan, J. van der Laan, L. Magielsen, P. A. Di Maio, G. Dell'Orco, R. K. Annabattula, J. T. Van Lew, H. Tanigawa, S. Van Til, Status of Ceramic Breeder Pebble Bed Thermo-mechanics R&D and Impact on Breeder Material Mechanical Strength, Fusion Engineering and Design, 87, 1130-1137 (2012) [Invited review article]
  87. R. K. Annabattula*, Y. Gan and M. Kamlah, Mechanics of binary and polydisperse spherical pebble assembly, Fusion Engineering and Design, 87, 853-858 (2012)
  88. Isaac Tamblyn, Ivana Aguiar, Ratna K. Annabattula, Gusphyl Justin, Kayvan Rafiee, A. Rios-Flores, Antonio Vicente, Jenny G. Vitillo and Deniz Wong, Energy outlook: A perspective from the new generation of materials researchers, MRS Bulletin, Energy Quarterly, 36, 963 (2011) (Editorial from the participants of the World Materials Summit and Student Congress WMS-2011)
  89. R. K. Annabattula and P. R. Onck*, Self-organizing nanochannel networks in periodically perforated semi-conductor films, Physical Review B, 84, 054101 (2011) (Also selected for publication in Virtual Journal of Nanoscale science & Technology)
  90. R. K. Annabattula, P. R. Onck*, Micron-scale Pattern formation in pre-stressed polygonal films, Journal of Applied Physics, 109, 033517 (2011)
  91. R. K. Annabattula, J. M. Veenstra, Y. F. Mei, O. G. Schmidt, P. R. Onck*, Self-organization of linear nanochannel networks, Physical Review B, 81, 224114 (2010) (Also selected for publication in Virtual journal of Nanoscale Science&Technology)
  92. R. K. Annabattula, W. T. S. Huck, P. R. Onck*, Micron-scale channel formation by the release and bond-back of pre-stressed thin films: a finite element analysis, Journal of the Mechanics and Physics of Solids, 58 (4), 447-465 (2010)
  93. A. Malachias, Y. Mei, Ratna K. Annabattula, C. Deneke, P. R. Onck, O. G. Schmidt*, Wrinkled-up Nanochannel Networks: Long-Range ordering, Scalability and X-ray Investigation, ACS Nano, 2 (8), 1715-1721 (2008) (This work was also highlighted in: Lab on a Chip 8, 1979 (2008))
  94. C. S. Jog*, R. Annabattula, The development of hybrid axisymmetric elements based on the Hellinger-Reissner variational principle, International Journal for Numerical Methods in Engineering,65 (13), 2279-2291 (2006)
#: Equal contribution
*: Corresponding author

International Conferences

  1. Sujith Reddy Jaggannagari, Raghuram Karthik Desu and Ratna Kumar Annabattula, DEM simulation of packing spherical particles into slender prismatic containers, Third international conference on powders, grains and bulk solids: innovations and applications (PGBSIA-2020), Patiala, India, 26-28 February 2020 (O)
  2. Akhil Vijayan and Ratna Kumar Annabattula, Fabric-Conductivity characteristics of cohesive periodic granular assemblies, Third international conference on powders, grains and bulk solids: innovations and applications (PGBSIA-2020), Patiala, India, 26-28 February 2020 (O)
  3. Akhil R Peeketi, Raghuram K Desu, Pramod Y Kumbhar and Ratna K Annabattula, Application of machine learning tools for thermal analysis of pebble beds, International workshop on ceramic breeder blanket interactions (CBBI-20), Karlsruhe, Germany, 18-21 September 2019 (O)
  4. Kanishk Mehta, Akhil R Peeketi, Patrick R. Onck and Ratna Kumar Annabattula, Computational modeling of surface topological transformations in viscoelastic, photo-responsive liquid crystal thin films, International Liquid Crystal Elastomer Conference (ILCEC-2019), Eindhoven, The Netherlands, 15-18 September, 2019 (O)
  5. A. L. N. Pramod, Hirshikesh, Ratna Kumar Annabattula, E. T. Ooi. S. Cong and S. Natarajan, Phase field modeling of quasi-static brittle fracture using the scaled boundary finite element method, 10thInternational Conference on Computational Methods (ICCM-2019), Singapore, 9-13 July 2019 (O)
  6. Akhil Vijayan, Baju C Joy and Ratna Kumar Annabattula, CFD-DEM simulation of fluid-flow assisted mixing of binary granular beds, 10thInternational Conference on Computational Methods (ICCM-2019), Singapore, 9-13 July 2019 (O)
  7. Raghu Ram Karthik Desu and Ratna Kumar Annabattula, DEM simulations of packing structures in pebble beds, 19thCeramic Breeder Blanket Interactions (CBBI-19), Kyoto, Japan, 21-23 September, 2017 (O)
  8. Anand Moorthy, Ratna Kumar Annabattula and Shankar Krishnapillai, A parametric study on the response of a granular bed to vertical sinusoidal excitation, Second International Conference and Exhibition on Powder, Granule and Bulk Solids: Innovations and Applications, Jaipur, India, 1-3 December, 2016, Paper: P65 (O)
  9. Akhil Vijayan and Ratna Kumar Annabattula, Evolution of conctact anisotropy in a granular assembly, Second International Conference and Exhibition on Powder, Granule and Bulk Solids: Innovations and Applications, Jaipur, India, 1-3 December, 2016, Paper: P40 (O)
  10. Joel Martis and Ratna Kumar Annabattula, An analytical and DEM study on the effective thermal conductivity of a packed granular bed, Second International Conference and Exhibition on Powder, Granule and Bulk Solids: Innovations and Applications, Jaipur, India, 1-3 December, 2016, Paper: P39 (O)
  11. Ratna Kumar Annabattula, S. Natarajan and N. Swaminathan, Coupled stress-diffusion effects on the chemo-mechanical response of an elastic body with geometric discontinuities, International Workshop on Mechanics of Energy Materials, Sydney, Australia, 14-15 November 2016. (O)
  12. T. Shabeeb*, N. Swaminathan and Ratna Kumar Annabattula, Geometric and material nonlinear design of stiffened plates for APC equipment, Insights and Innovations in Structural Engineering, Mechanics and Computation: Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation, Cape Town, South Africa, 5-7 September 2016, ISBN: 9781138029279. (O)
  13. T. Shabeeb*, N. Swaminathan,Ratna Kumar Annabattula and J. Wistrom, EN1990 Eurocode: Partial factors for process loads in industrial equipment, Insights and Innovations in Structural Engineering, Mechanics and Computation: Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation, Cape Town, South Africa, 5-7 September 2016, ISBN: 9781138029279. (O)
  14. Akhil Vijayan Panicker*, Akhil Reddy, Ratna Kumar Annabattula and Narasimhan Swaminathan, Mechanics of lithium intercalation in anode materials using Discrete Element Method, World Congress on Computational Mechanics & Asia-Pacific Congress on Computational Mechanics (WCCM-XII & APCOM-VI), 24-29 July 2016, Seoul, Korea. (O)
  15. M. Anand*, R. K. Annabattula and K. Shankar, Modelling of Damping and Heat Transfer in Particle Dampers through DEM, World Congress on Computational Mechanics & Asia-Pacific Congress on Computational Mechanics (WCCM-XII & APCOM-VI), 24-29 July 2016, Seoul, Korea. (O)
  16. Hirshikesh*, Raghuram Karthik Desu, R. K. Annabattula and S. Natarajan, Mechanics of crushable pebble assembly - a coupled XFEM-DEM approach, World Congress on Computational Mechanics & Asia-Pacific Congress on Computational Mechanics (WCCM-XII & APCOM-VI), 24-29 July 2016, Seoul, Korea. (O)
  17. Raghuram Karthik Desu*, R. K. Annabattula, Y. Gan and M. Kamlah, Mechanics of binary crushable pebble assembly, International Conference on Fusion Reactor Materials (ICFRM-17), 11-16 October 2015, Aachen, Germany. (P)
  18. Y. Gan*, F. Hernandez, R. K. Annabattula, M. Kamlah and P. Pereslavtsev, A thermal discrete element analysis of EU solid breeder blanket subjected to neutron irradiation, International Conference on Fusion Reactor Materials (ICFRM-16), 20-25 October 2013, Beijing, China. (P)
  19. R. K. Annabattula, M. Kolb, Y. Gan, R. Rolli and M. Kamlah, Size-dependent crush analysis of lithium orthosilicate pebbles, International Conference on Fusion Reactor Materials (ICFRM-16), 20-25 October 2013, Beijing, China. (P)
  20. E. A. Flores-Johnson*, L. Shen, R. K. Annabattula, P. R. Onck, Y. G. Shen and Z. Chen, Finite element modeling of stress-induced fracture in Ti-Si-N films, 1st Australian Conference on Computational Mechanics, 3-4 October 2013, Sydney, Australia. (O)
  21. Francisco Hernandez Gonzalez*, Matthias Kolb, Ratna Annabattula, G. Schlindwein and Axel von der Weth, Construction of PREMUX and preliminary experimental results, as preparation for the HCPB Breeder Unit mock-up testing, Internation Symposium on Fusion Nuclear Technology (ISFNT-11), 16-20 September 2013, Barcelona, Spain. (P)
  22. Y. Gan*, R. K. Annabattula, M. Kamlah and I. Einav, The micromechanics of heat flow in compressed granular media, Australian Conference on the Mechanics of Structures and Materials (ACMSM-2012), 11-14 December 2012, Sydney, Australia. (O)
  23. M. Kolb*, R. K. Annabattula, R. Knitter and M. Kamlah, Determination of friction coefficients of tritium breeders and their influence on pebble bed mechanics, Symposium on Fusion Technology (SOFT-2012), 24-28 September 2012, Leige, Belgium. (P)
  24. R. K. Annabattula, Y. Gan and M. Kamlah, Mechanics of a crushable pebble assembly using discrete element method: for application in nuclear fusion, European Solid Mechanics Conference (ESMC-2012), 9-13 July 2012, Graz, Austria. (O)
  25. R. K. Annabattula, J. Ott, Y. Gan, R. Mc Meeking and M. Kamlah, Granular Mechanics for Sustainable Energy, The Sustainability Development Forum, MRS Spring Meeting, 9-13 September 2012, San Francisco, USA. (P)
  26. R. K. Annabattula, Y. Gan and M. Kamlah, Thermomechanics of Pebble Beds in Nuclear Fusion, World Materials Summit and Student Congress (WMS2011), 8-12 October 2011, Washington D.C., USA. (P)
  27. R. K. Annabattula, Y. Gan and M. Kamlah, Mechanics of binary and polydisperse pebble assemblies, International Symposium on Fusion Nuclear Technology (ISFNT-10), 11-16 September 2011, Portland, USA. (P)
  28. R. K. Annabattula, S. Zhao, Y. Gan and M. Kamlah, Crushing analysis of pebbles in pebble beds, Ceramic Breeder Blanket Interactions (CBBI-16), 8-10 September 2011, Portland, USA. (O)
  29. R. K. Annabattula, P. R. Onck, Micron-scale self formation in thin film systems, MRS Fall Meeting 2007, Boston, USA. (O)
  30. R. K. Annabattula, P. R. Onck, Buckle-driven delamination in thin polymer films, Proceedings of the 3rd international conference on Multiscale Materials Modelling, Sep 18-22, 2006, Freiburg, Germany. (O)
  31. R. K. Annabattula, Planar hybrid finite elements with drilling degrees of freedom, International conference on computational methods in fluids, acoustics, heat transfer and electromagnetics, July 24-25, 2006, Andhra University, Visakhapatnam, India.

(P) : Poster Presentation
(O) : Oral Presentation
(*)  : Presenting/Corresponding Author

National Conferences

  • R. K. Annabattula, P. R. Onck, Buckle-driven delamination and subsequent bond-back in thin films, Nano/-MicroNed Symposium, Dec 8-9 2005, Groningen, The Netherlands. (O)
  • R. K. Annabattula, P. R. Onck, Self formation of rolled-up micro/nano tubes from a pre-stressed bilayer - a finite element analysis, NanoNed/MicroNed National Symposium, Nov 16-17 2006, Eindhoven, The Netherlands. (O)
  • R. K. Annabattula, P. R. Onck, Self-organized pattern formation in thin film systems, National Micro-Nano Conference, Nov. 15-16 2007, Wageningen, The Netherlands. (O)

(P) : Poster Presentation
(O) : Oral Presentation
(*)  : Presenting/Corresponding Author

Invited Presentations

  • R. K. Annabattula, Phase-Field Modeling of Fracture: Functionally Graded Materials and Piezocomposites, 14 July 2020, Inaugural Webinar for the Faculty Development Program on High-Performance Engineering Materials at Anil Neerukonda Institute of Technology and Sciences, Visakhapatnam, India
  • R. K. Annabattula, Mechanics of Ligh-Responsive Liquid Crystal Thin Films, 17 July 2020, Inaugural Webinar on the Occasion of Platinum Jubilee Celebrations, Department of Mechanical Engineering, University College of Engineering, Jawaharlal Nehru Technological University Kakinada, Andhrapradesh, India
  • R. K. Annabattula, Application of Computational Methods to Engineering Problems, 17 December 2019, Guest lecture to students of polytechnic colleges across the state of Andhrapradesh through video conference delivered at S. V. Government Polytechnic, Tirupati, India
  • R. K. Annabattula, Discrete Element Method and its Applications, Short Course on Advanced Computational Methods for Fracture/Failure of Materials, 6-7 December 2019, IIT Bhubaneswar, India
  • R. K. Annabattula, Finite Element Modeling of Fracture using Phase Field Method, 04 September 2019, Faculty Development Program on Advanced FEA, SRM Institute of Science and Technology, Chennai, India
  • R. K. Annabattula, A short course on Introduction to Discrete Element Method, 4-5 April 2019, IIT Bhubaneswar, India
  • R. K. Annabattula, Reliability based Design, Guest lecture at College of Engineering Guindy, 29 May 2018, Chennai, India
  • R. K. Annabattula, Guest lecture for the TEQIP course on Finite Element Analysis, IIT Indore, 22-27 March 2018
  • R. K. Annabattula, Computational methods and analysis techniques for mechanical design, 26 October 2016, Vellore Institute of Technology, Vellore, India
  • R. K. Annabattula, Fusion for Energy: Role of Mechanics, 27-June 2013, GITAM University, Visakhapatnam, India
  • R. K. Annabattula, Granular Mechanics for Nuclear Fusion, 8-November 2012, Thomas Young Centre's Lunch Time Get-Together, London, UK
  • R. K. Annabattula, Mechanics of Pebble Beds for Nuclear Fusion and other sustainable technologies, 23-October 2012, Department of Civil, Environmental and Geomatic Engineering, University College London (UCL), London, UK
  • R. K. Annabattula, Buckling-driven self formation of microchannels, 20-July 2012, Particles and Grains Laboratory, The University of Sydney, Sydney, Australia
  • R. K. Annabattula, A Micromechanical Approach to Thermomechanics of Pebble Beds in Fusion Reactors, 27-June 2012, Indian Institute of Technology-Hyderabad, Hyderabad, India
  • R. K. Annabattula, Buckling-driven self-formation of micro channels, 18-May-2012 at Department of Mechanical Engineering, Indian Institute of Technology-Delhi, Delhi, India
  • R. K. Annabattula, M. Kamlah, Thermomechanics of Granular Materials for Nuclear Fusion, 17-May-2012 at Department of Applied Mechanics, Indian Institute of Technology-Delhi, Delhi, India
  • R. K. Annabattula, M. Kamlah, Thermomechanics of Granular Materials for Nuclear Fusion, 16-May-2012 at Department of Applied Mechanics, Indian Institute of Technology-Madras, Chennai, India
  • R. K. Annabattula, Buckling-driven self-formation of linear channels on 08-February-2012 at Indian Institute of Technology, Hyderabad, India
  • R. K. Annabattula, Thermomechanics of pebble beds for nuclear fusion: a micromechanical approach, on 07-February-2012 at Institute for Plasma Research, Gandhinagar, India
  • R. K. Annabattula, Fusion for Energy: Role of Materials Modeling on 09-March-2012 at College of Engineering, Andhra University, Visakhapatnam, India
  • R. K. Annabattula, Buckling and Rolling of pre-stressed thin films, Max-Planck Institute for Solid State Research, Stuttgart, in the Molecular Beam Epitaxy group (Prof. O. G. Schmidt)
  • R. K. Annabattula, Buckle-driven self formation of microchannels, Summer School of Institute of Materials Research, Karlsruhe Institute of Technology, Germany

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 : Room No.208, Machine Design Section

: Department of Mechanical Engineering

: IIT Madras

: ratna@iitm.ac.in

 : +91-44-2257-4719