Publications

Journal Articles

* Corresponding Author.       =Equally Contributed Authors.    Thevamaran Lab Members.

2020

22. Fang Y., Kottos T., Thevamaran R.* (2020): A universal route for the emergence of exceptional points in PT-symmetric metamaterials with unfolding spectral symmetries. Submitted. arXiv Link

21. Hyon J., Lawal O., Thevamaran R., Song Y.E., Thomas E.L.(2020): Extreme energy dissipation via morphology evolution in carbon nanotube mats. Submitted.

20. Lee S. Cai J., Jin S., Zhang D., Thevamaran R., Xu H.(2020): Coesite formation at low-pressure during supersonic micro projectile impact of opal. ACS Earth and Space Chemistry. doi: 10.1021/acsearthspacechem.0c00090

19. Cai J., Thevamaran R.(2020): Superior energy dissipation by ultrathin semicrystalline polymer films under supersonic microprojectile impacts. Nano Letters. doi: 10.1021/acs.nanolett.0c00066

News: Shields up: Nanomaterial bests all others in blocking speeding projectiles

18. Dominguez-Rocha V., Thevamaran R., Ellis F.*, Kottos T. (2020): Environmentally induced exceptional points in elastodynamics. Physical Review Applied. doi: 10.1103/PhysRevApplied.13.014060.  arXiv Link.

17. Murgado D., Thevamaran R.(2020): Independent control of dynamic material properties by exploiting structural hierarchy and intrinsic structural gradients. Materials Today Communicationsdoi: 10.1016/j.mtcomm.2019.100865.

16. Thevamaran R.*, Griesbach C., Yazdi S., Ponga M., Alimadadi H., Lawal O., Jeon S-J., Thomas E.L. (2020): Dynamic martensitic phase transformation in single-crystal silver microcubes, Acta Materialia, https://doi.org/10.1016/j.actamat.2019.10.006.

2019

15. Thevamaran R.*,=, Branscomb R.M.=, Makri E., Anzel P., Christodoulides D., Kottos T., Thomas E.L. (2019): Asymmetric acoustic energy transport in non-Hermitian metamaterials, The Journal of the Acoustical Society of Americadoi:10.1121/1.5114919, arXiv Link.

2018

14. Hyon J., Lawal O., Fried O., Thevamaran R., Yazdi S., Zhou M., Veysset D., Kooi S.E., Jiao Y., Hsiao M-S., Streit J., Vaia R.*, Thomas E.L.*, Extreme energy absorption in glassy polymer thin films by supersonic micro-projectile impact, Materials Today, 2018, doi:10.1016/j.mattod.2018.07.014.

News: Polystyrene makes an impact under fire, Nano Letters Cover

13. Scheffer V.C., Thevamaran R., Coluci V.R.*, Compressive response and deformation mechanisms of vertically aligned helical carbon nanotube forests, Applied Physics Letters, 2018, 112, pp.021902 1-5, doi: 10.1063/1.5008983.

2017

12. Xue S., Fan Z., Lawal O., Thevamaran R., Li Q., Liu Y., Yu K.Y., Li Q., Wang J., Thomas E.L., Wang H., Zhang X.*, High velocity projectile impact induced 9R phase in ultrafine grained aluminum, Nature Communications, 2017, 8(1), pp.1653 1-9, doi:10.1038/s41467-017-01729-4.

News: Nanowerk, New Atlas, Green Car Congress.

11. Malak S.T., Liang G., Thevamaran R., Yoon Y.J., Smith M.J., Jung J., Lin C.H., Lin Z., Thomas E.L., Tsukruk V.V.*, High-resolution quantum dot photopatterning via interference lithography assisted microstamping, The Journal of Physical Chemistry C, 2017, 121(24), pp.13370-13380, doi: 10.1021/acs.jpcc.7b03731.

10. Thevamaran R., Saini D., Karakaya M., Zhu J., Podila R., Rao A.M., Daraio C.*, Impact properties of carbon fiber reinforced bucky sponges, Nanotechnology, 2017, 28(18), 184002(pp.8), doi:10.1088/1361-6528/aa6904.

2016

09. Thevamaran R.*, Lawal O., Yazdi S., Jeon S-J., Lee J-H., Thomas E.L.*, Dynamic creation and evolution of gradient nanostructure in single-crystal metallic micro-cubes, Science, 2016, 354(6310), pp.312-316, doi:10.1126/science.aag1768.

News: AAAS EurekaAlert, Futurity (Featured article and video), NanoTechWeb (UK Institute of Physics), Materials Today, Technology.org (Spotlight News), Materials Gate, Controlled Environments, Physics.org, Nanotechnology Now, R&D Magazine, ECN Magazine, Science Daily, MRS Bulletin, Rice University Press.

08. Jeon S-J., Yazdi S., Thevamaran R., Thomas E.L.*, Synthesis of monodisperse single crystalline Ag microcubes via seed-mediated growth, Crystal Growth & Design, 2016, 17(1), pp.284-289 doi:10.1021/acs.cgd.6b01523.

07. Thevamaran R., Raney J.R., Daraio C.*, Rate-sensitive strain localization and impact response of carbon nanotube foams with microscale heterogeneous bands, Carbon, 2016, 101, pp.184-190, doi:10.1016/j.carbon.2015.12.069.

2015

06. Lattanzi L., Thevamaran R., De Nardo L., Daraio C.*, Dynamic behavior of vertically aligned carbon nanotubes with patterned microstructures, Advanced Engineering Materials, 2015, 17(10), pp.1470-1479, doi:10.1002/adem.201400571.

05. Thevamaran R., Karakaya M., Meshot E.R., Fisher A., Podila M., Rao A.M., Daraio C.*, Anomalous impact and strain responses in helical carbon nanotube foams, RSC Advances, 2015, 5, pp.29306-29311, doi:10.1039/C5RA03561A.

04. Thevamaran R., Meshot E.R., Daraio C.*, Shock formation and rate effects in impacted carbon nanotube foams, Carbon, 2015, 84, pp.390-398, doi:10.1016/j.carbon.2014.12.006.

2014

03. Karakaya M., Saini D., Podila R., Skove M.J., Rao A.M.*, Thevamaran R., Daraio C., Self-assembled recyclable hierarchical bucky aerogels, Advanced Engineering Materials, 2014, 17(7), pp.990-994, doi:10.1002/adem.201400414.

02. Thevamaran R., Fraternali F., Daraio C.*, Multi-scale mass-spring model for high-rate compression of vertically aligned carbon nanotube foams, Journal of Applied Mechanics, 2014, 81(12), pp.121006-1-6, doi:10.1115/1.4028785.

01. Thevamaran R., Daraio C.*, An experimental technique for dynamic characterization of soft complex materials, Experimental Mechanics, 2014, 54 (8), pp.1319-1328, doi:10.1007/s11340-014-9896-9.

Research Theses

Doctoral Theses

Ramathasan Thevamaran (2015): Rate and microstructure effects on the dynamics of carbon nanotube foams, PhD in Mechanical Engineering, Division of Engineering and Applied Sciences, California Institute of Technology. Link.

Master’s Theses

Claire Griesbach (2019): Quasi-static and high-velocity impact deformations of single-crystal silver microcubes, Master of Science in Engineering Mechanics, Department of Engineering Physics, College of Engineering, University of Wisconsin-Madison.

David Murgado (2019): Tunable dynamic properties of vertically aligned carbon nanotube foams, Master of Science in Engineering Mechanics, Department of Engineering Physics, College of Engineering, University of Wisconsin-Madison.

Conferences

* Presenting Author.         Thevamaran Lab Members.

38. Fang Y., Kottos T., Thevamaran R.*: Emergence of Exceptional Points in PT-Symmetric Fractal Elastodynamic Metamaterials, IMECE International Mechanical Engineering Virtual Congress & Exposition, American Society of Mechanical Engineers (ASME), November 2020

37. Griesbach C.*, Thevamaran R.: Strength and Toughness of Gradient Nano-Grained Silver Created via High-Velocity Impact of Single-Crystal Silver Microcubes. Virtual XIV International Congress, Society for Experimental Mechanics, September 2020.

36. Cai J.*, Thevamaran R.: Superior Energy Dissipation by Nanoscale Semi-crystalline Polymer Films Under High-speed Micro-Projectile Impacts. “2019 MRS Fall Meeting,” Materials Research Society, Boston, MA, USA, December 2019.

35. Griesbach C.*, Thevamaran R.: High-velocity impact induced gradient-nano-grained structure and phase transformation. “2019 MRS Fall Meeting,” Materials Research Society, Boston, MA, USA, December 2019 (Poster).

34. Fang Y.*, Kottos T., Thevamaran R.: PT-symmetric fractal architectures for controlling mechanical wave propagation. 56thAnnual Technical Meeting of the Society of Engineering Science (SES 2019), St. Louis, MO, October 2019.

33. Murgado D.*, Thevamaran R.: Nonlinearly tunable linear dynamic response of vertically aligned carbon nanotube foams. 56thAnnual Technical Meeting of the Society of Engineering Science (SES 2019), St. Louis, MO, October 2019.

32. Griesbach C.*, Thevamaran R.: Size-effects in single-crystal silver nanocubes. 56thAnnual Technical Meeting of the Society of Engineering Science (SES 2019), St. Louis, MO, October 2019.

31. Cai J.*, Hossain S., Thevamaran R.: Size dependent mechanical behavior of semi-crystalline polymer thinfilms under high-speed microprojectile impacts. 56thAnnual Technical Meeting of the Society of Engineering Science (SES 2019), St. Louis, MO, October 2019.

30. Dominguez-Rocha V., Thevamaran R., Ellis F., Kottos T.*: Controlling the formation of exceptional point degeneracies via engineered environment. 56thAnnual Technical Meeting of the Society of Engineering Science (SES 2019), St. Louis, MO, October 2019.

29. Murgado D.*, Thevamaran R., Highly tunable dynamic response of vertically aligned carbon nanotube foams, Michael Sutton International Student Paper Competition, 2019 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Society for Experimental Mechanics, Reno, NV, June 2019.

28. Murgado D.*, Thevamaran R.: Highly tunable dynamic response of vertically aligned carbon nanotube foams, Challenges in Mechanics of Time Dependent Materials. 2019 SEM Annual Conference and Exposition on Experimental and Applied Mechanics (Society for Experimental Mechanics), Reno, NV, June 2019.

27. Griesbach C.*, Thevamaran R.: Probing the size effects in metals using in situ SEM microcompressions. “Microscopy and Microanalysis 2019,” Midwest Microscopy and Microanalysis Society, Madison, WI, May 2019.

26. Murgado D.*, Thevamaran R., Highly tunable dynamic response of vertically aligned carbon nanotube foams, Challenges in Mechanics of Time Dependent Materials, 2019 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Society for Experimental Mechanics, Reno, NV, June 2019.

25. Lawal O., Hyon J.*, Thevamaran R., Thomas E.L., Microballistic deformation behavior of carbon nanotube mats, Bulletin of the American Physical Society, APS March Meeting, Boston, MA, March 2019.

24. Thevamaran R.*, Branscomb R.M., Christodoulides D., Kottos T., Thomas E.L., Asymmetric acoustic wave propagation in non-Hermitian metamaterials, 55th Annual Technical Meeting of the Society of Engineering Science, Madrid, Spain, Oct 2018.

23. Thevamaran R.*, Yazdi S., Ponga M., Lawal O., Jeon S-J., Thomas E.L., Phase transformation in single-crystal silver microcubes during high-velocity impact, 2018 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Society for Experimental Mechanics, Greenville, SC, USA, Jun 2018.

22. Thomas E.L.*, Hyon J., Lawal O., Fried O., Thevamaran R., Yazdi S., Zhao M., Veysset D., Kooi S., Jiao Y., Hsiao M-S., Streit J., Vaia R., Extreme plastic deformation of glassy polymer thin films at ballistic strain rates, Bulletin of the American Physical Society, APS March Meeting, Los Angeles, CA, USA, Mar 2018.

21. Lawal O., Fried O., Thevamaran R.*, Thomas E.L., Dynamic deformation of the assembly of polymer grafted nanoparticles, ASME International Mechanical Engineering Congress and Exposition (IMECE 2017), American Society of Mechanical Engineers, Tampa, FL, USA, Nov 2017.

20. Thevamaran R.*, Pathak S., Yazdi S., Jeon S-J., Lawal O., Mara N., Thomas E.L., Size effects in single-crystal metallic micro- and nanocubes, 2017 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Society for Experimental Mechanics, Indianapolis, IN, USA, Jun 2017.

19. Thevamaran R.*, Lawal O., Yazdi S., Jeon S-J., Thomas E.L., Engineering nano/microstructure of metals via high-velocity impact, 2016 MRS Fall Meeting, Materials Research Society, Boston, MA, USA, Nov 2016.

18. Thevamaran R.*, Lawal O., Yazdi S., Jeon S-J., Thomas E.L., Dynamic behavior of single crystalline silver microcubes, 24th International Congress of Theoretical and Applied Mechanics (ICTAM 2016), Montreal, Canada, Aug 2016.

17. Thevamaran R.*, Dynamics of hierarchical materials, British Society for Strain Measurement – Young Stress Analyst Competition, International Congress on Experimental Mechanics, European Society for Experimental Mechanics, University of Cambridge, UK, Jul 2014.

16. Thevamaran R., Saini D.*, Karakaya M., Podila R., Rao A.M., Daraio C., Impact response of helically coiled carbon nanotube foams, Bulletin of the American Physical Society, APS March Meeting, Denver, CO, USA, Mar 2014.

15. Thevamaran R., Saini D.*, Karakaya M., Podila R., Rao A.M., Daraio C., Static and dynamic response of bucky sponges, Bulletin of the American Physical Society, APS March Meeting, Denver, CO, USA, Mar 2014.

14. Thevamaran R.*, Lattanzi L., Daraio C., Nonlinear non-affine deformation behavior of vertically aligned carbon nanotube structures subjected to impact loadings, 2013 MRS Fall Meeting, Materials Research Society, Boston, MA, USA, Dec 2013.

13. Thevamaran R.*, Lattanzi L., Daraio C., Dynamic behavior of micro-architectures of vertically aligned carbon nanotubes, 4th Canadian Conference on Nonlinear Solid Mechanics (CanCNSM 2013), Montreal, Quebec, Canada, Jul 2013.

12. Thevamaran R.*, Daraio C., Dynamics of vertically aligned carbon nanotube foams, Materials Research Center Graduate Symposium, ETH Zurich, Switzerland, Jun 2013 (Poster).

11. Thevamaran R.*, Daraio C., Dynamic characterization of vertically aligned carbon nanotube foams, 2013 SEM XIII International Congress & Exposition on Experimental & Applied Mechanics, Society for Experimental Mechanics, Chicago, IL, USA, Jun 2013.

10. Thevamaran R.*, Yamamoto N., Daraio C., Wave propagation in multilayered structures composed of carbon nanotubes and rigid interlayers under small velocity impacts, 23rd International Congress of Theoretical and Applied Mechanics (ICTAM 2012), Beijing, China, Aug 2012.

09. Thevamaran R.*, Daraio C., Dynamics of multilayered structures of VACNTs with metallic inter-layers, Dynamic Behavior of Materials: Volume I, Proceedings of the 2012 SEM XII International Congress & Exposition on Experimental & Applied Mechanics, Costa Mesa, CA, USA, Jun 2012.

08. Yamamoto N.*, Thevamaran R., Daraio C., Dynamic behavior of periodic structures consisting of vertically aligned carbon nanotubes and rigid interlayer, 53rd Structures, Structural Dynamics, and Materials and Co-located Conferences, American Institute for Aeronautics and Astronautics, Honolulu, HI, Apr 2012.

07. Raney J.R.*, Thevamaran R.*, Daraio C., Hierarchical carbon nanotube architectures for mechanical energy absorption, 2012 Institute for Collaborative Biotechnologies (ICB) Army – Industry Collaboration Conference, Santa Barbara, California, Feb 2012 (Poster).

06. Raney J.R.*, Misra A., Thevamaran R.*, Daraio C., Tailored deformation in hierarchical carbon nanotube structures, 2011 Institute for Collaborative Biotechnologies (ICB) Army – Industry Collaboration Conference, Santa Barbara, California, Feb 2011 (Poster).

05. Illeperuma W.R.K.*, Senthuran U., Thevamaran R., Ranaweera M.P., Herath K.R.B., Multi axial behaviour of carbon nanotubes, Peradeniya University Research Session (PURSE), University of Peradeniya, Sri Lanka, Dec 2008.

04. Thevamaran R.*, Illeperuma W.R.K., Senthuran U., Ranaweera M.P., Herath K.R.B., On the anisotropy of carbon nanotubes, International conference on advances in continuum mechanics, materials science, nanoscience and nanotechnology, University of Peradeniya, Sri Lanka, Sep 2008.

03. Illeperuma W.R.K.*, Senthuran U., Thevamaran R., Ranaweera M.P., Herath K.R.B., Anisotropic elastic properties of graphene, International conference on advances in continuum mechanics, materials science, nanoscience and nanotechnology, University of Peradeniya, Sri Lanka, Sep 2008.

02. Herath S.R.*, Thevamaran R., Illeperuma W.R.K., Ranaweera M.P., Herath K.R.B., Radial properties of carbon nanotubes, International conference on advances in continuum mechanics, materials science, nanoscience and nanotechnology, University of Peradeniya, Sri Lanka, Sep 2008.

01. Thevamaran R.*, Senthuran U., Illeperuma W.R.K., Ranaweera M.P., Herath K.R.B., Mechanics of Nano-structures, Sustainable Infrastructure Development in Asia – International Exchange Symposium, University of Peradeniya, Sri Lanka, Sep 2008.

Invited Technical Talks/Seminars

10. “Microballistics: Dynamic Creation of Nanostructures in Metals to Engineering Energy Dissipation in Nanostructured Materials!”, Frontiers in Mechanical Engineering and Sciences–A Multi-University Webinar by University of Michigan, Purdue University, UCLA, Texas A&M, University of Wisconsin-Madison, University of Minnesota, University of Maryland, and Penn State. Oct 2020.

09. “Microballistics: Dynamic Creation of Nanostructures in Metals to Engineering Energy Dissipation in Nanostructured Materials!”, Mechanical Engineering Seminar, Indian Institute of Science (IISc) – Bangalore, India, Sep 2020. (Presented Virtually).

08. “Gradient-nano-grained structure and phase transformations via high-velocity impact of metallic microcubes”, International Conference on Plasticity, Damage, and Fracture (Plasticity 2020): Symposium on physics and mechanics of metallic material interfaces. Rivera Maya, Mexico, Jan 2020.

07. “Microballistics: From martensitic phase transformation in metals to superior energy dissipation in ultrathin polymer films”, School of Engineering Research Seminar: Center for Material Innovation and Future Fashion (CMIFF), RMIT University, Melbourne, Australia, Dec 2019.

06. “Controlling acoustic waves with non-Hermitian metamaterials,” AmeriMech 2019: Topical symposium on nonreciprocal and topological wave phenomena. University of Missouri, Columbia, MO, May 2019.

05. “Gradient microstructures for synergistic improvement of mechanical properties of metals”, Solid Mechanics Seminar, Laboratoire de Mechanique des Solides – CNRS – Ecole Polytechnique, Palaiseau, France, Oct 2018.

04. “Hierarchical and gradient microstructures for controlling mechanical properties”, MSE900: Materials Science and Engineering Seminar, University of Wisconsin-Madison, Wisconsin, WI, Mar 2018.

03. “Engineering nano/microstructure of metals via high-velocity impact”, Grainger Institute Early Career Seminar, University of Wisconsin-Madison, Wisconsin, WI, Nov 2017.

02. “Structured materials for controlling mechanical waves”, Physics Colloquium, Wesleyan University, Middletown, CT, Oct 2017.

01. “Structured materials for controlling mechanical waves”, Engineering Physics Seminar, University of Wisconsin-Madison, Madison, WI, Oct 2017.