Dr. Ricardo A. Lebensohn
Scientist 4, Materials Science and Technology Division, Los Alamos National Laboratory
Address: MST8, MS G755, Los Alamos, NM, 87545, USA
Phone #: +1-505-665-3035
Fax #: +1-505-667-8021
ResearcherID (papers, citations, h-index):
1989: Licenciado en Fisica, Faculty of Science and Engineering (FCEIA), Universidad Nacional de Rosario (UNR), Argentina.
1993: PhD in Physics, FCEIA, UNR, Rosario, Argentina.
2011: Defense Programs Award of Excellence, National Nuclear Security Administration (NNSA), USA, as part of the Process Engineering and Design for Improved Component Testing (PREDICT) team, "in recognition of significant achievements in quality, productivity, cost savings, safety, or creativity in support of NNSA's programs".
2010: Humboldt Research Award for Senior US Scientists, Humboldt Foundation, Germany, "in recognition of a researcher's entire achievements to date to academics whose fundamental discoveries, new theories, or insights have had a significant impact on their own discipline".
1997: Fulbright Scholarship. Department of Geology and Geophysics, University of California, Berkeley, USA.
Mechanics of materials. Homogenization and full-field solutions of mechanical properties of heterogeneous media. Constitutive laws. Plastic deformation, texture development and microstructure evolution of metals and minerals.
VPSC (ViscoPlastic Self-Consistent) Code
The code VPSC code (developed and maintained by R.A. Lebensohn and C.N Tome) is a multipurpose polycrystal plasticity research code, based on the knowledge of the mechanisms of slip and twinning that are active in single crystals of arbitrary symmetry. VPSC can be used to predict the effective stress-strain response, texture evolution, anisotropy, etc., and it is presently used as a predictive tool for metallic and geological material systems, for parameter identification, interpretation of experimental results and multiscale calculations, in academic and industrial applications, etc., by numerous research groups worldwide (Presently, the VPSC code distribution list has more than 120 registered users in Academia, National Laboratories and Industry).
Contact us, if you are interested in the VPSC formulation and code ...
Full-field FFT-based Formulation
This formulation (originally developed by P. Suquet and coworkers as a fast algorithm to compute the linear and nonlinear response of composites using as input a digital image of their microstructures) has been adapted by us to treat 3-D polycrystals deforming by dislocation glide. The FFT-based model provides an exact solution of the governing equations, has better performance than a Finite Element calculation for the same purpose and resolution, and can use voxelized microstructure data as direct input.
Contact us, if you are interested in the FFT-based formulation ...
1. R.A. Lebensohn and C.N. Tome: "A selfconsistent approach for the simulation of plastic deformation and texture development of polycrystals: application to Zirconium alloys". Acta Metallurgica et Materialia 41, pp 2611-2624 (1993). 578 citations. (PDF)
2. C.N. Tome, R.A. Lebensohn and U.F. Kocks: "A model for texture development dominated by deformation twinning: application to Zirconium alloys". Acta Metallurgica et Materialia 39, pp 2667-2680 (1991). 161 citations. (PDF)
3. I.J. Beyerlein, R.A. Lebensohn and C.N. Tome: Modeling of texture and microstructural evolution in the equal channel angular process". Materials Science and Engineering A345, pp.122-138 (2003). 98 citations. (PDF)
4. C.N. Tome, P.J. Maudlin, R.A. Lebensohn and G.C. Kaschner: "Mechanical response of zirconium. Part I: Derivation of a polycrystal constitutive law and finite element analysis". Acta Materialia 49, pp 3085-3096 (2001). 96 citations. (PDF)
5. R.A Lebensohn and C. Tome: A self-consistent visco-plastic model: calculation of rolling textures of anisotropic materials". Material Science and Engineering A 175, pp 71-82 (1994). 85 citations. (PDF)
6. R.A. Lebensohn: "N-site modelling of a 3D viscoplastic polycrystal using Fast Fourier Transform". Acta Materialia 49, pp 2723-2737 (2001). 77 citations. (PDF)
7. O. Castelnau, P. Duval, R.A. Lebensohn and G. Canova: "Viscoplastic modelling of texture development in polycrystalline ice with a self-consistent approach: comparison with bound estimates". Journal of Geophysical Research B 101, pp 13851-13868 (1996). 71 citations. (PDF)
8. R.A. Lebensohn, Y. Liu and P. Ponte Castaneda: "On the accuracy of the self-consistent approximation for polycrystals: comparison with full-field numerical simulations". Acta Materialia 52, pp. 5347-5361 (2004). 52 citations. (PDF)
9. R.A. Lebensohn and G.R. Canova: A selfconsistent approach for modelling texture development of two-phase polycrystals: application to Titanium alloys". Acta Materialia 45, pp 3687-3694 (1997). 52 citations. (PDF)
10. R.A. Lebensohn, C.N. Tome and P. Ponte Castaneda: "Self-consistent modeling of the mechanical behavior of viscoplastic polycrystals incorporating intragranular field fluctuations". Philosophical Magazine 87, pp. 4287-4322 (2007). 43 citations. (PDF)
11. C.N. Tome, R.A. Lebensohn and C.T Necker: "Orientation correlations and anisotropy of recrystallized aluminium". Metallurgical and Materials Transactions 33A, pp 2635,2648 (2002). 37 citations. (PDF)
12. R.A. Lebensohn and C.N. Tome: "A study of stress state associated with twinning nucleation and propagation in anisotropic materials. Philosophical Magazine A 67, pp 187-206 (1993). 34 citations. (PDF)
13. R.A. Lebensohn R. Brenner, O. Castelnau and A.D. Rollett: "Orientation image-based micromechanical modelling of subgrain texture evolution in polycrystalline copper". Acta Materialia 56, pp. 3914-3926 (2008). 32 citations. (PDF)
14. O. Castelnau, H. Francillette, B. Bacroix and R.A. Lebensohn: "Texture dependent plastic behavior of Zr-702 at large strain". Journal of Nuclear Materials 297, pp 14-26 (2001). 31 citations. (PDF)
15. R.A Lebensohn, H.-R. Wenk and C.N. Tome: "Modelling deformation and recrystallization textures in calcite". Acta Materialia 46, pp 2683-2693 (1998). 31 citations. (PDF)
16. R.A. Lebensohn, Y. Liu and P. Ponte Castaneda: "Macroscopic properties and field fluctuations in model power-law polycrystals: full-field solutions versus self-consistent estimates". Proceedings of the Royal Society of London A 460, pp. 1381-1405 (2004). 28 citations. (PDF)
17. D. Hughes, R.A. Lebensohn, H.-R. Wenk and A. Kumar: "Stacking fault energy and microstructure effect on torsion texture evolution". Proceedings of the Royal Society of London A 456, pp 921-954 (2000). 28 citations. (PDF)
18. B. Plunkett, R. A. Lebensohn, O. Cazacu and F. Barlat: "Evolving yield function of hexagonal materials taking into account texture development and anisotropic hardening". Acta Materialia 54, pp. 4159-4169 (2006). 27 citations. (PDF)
19. T. Takeshita, H.-R. Wenk and R. Lebensohn: "Development of preferred orientation and microstructure in sheared quartzite: comparison of natural data and simulated results". Tectonophysics 312, pp. 133-155 (1999). 27 citations. (PDF)
20. H.-R. Wenk, J.R. Baumgardner, R.A. Lebensohn and C.N. Tome: "A convection model to explain anisotropy of the inner core". Journal of Geophysical Research B 105, pp 5663-5673 (2000). 26 citations. (PDF)
21. R.A. Lebensohn, P.A. Turner, J.W. Signorelli, G.R. Canova and C.N. Tome: "Calculation of intergranular stresses based on a large strain viscoplastic selfconsistent polycyrstal model". Modelling and Simulation in Materials Science and Engineering 6, pp 447-465 (1998). 26 citations. (PDF)
22. O. Castelnau, G.R. Canova, R.A. Lebensohn and P. Duval: "Modelling viscoplastic behavior of anisotropic polycrystalline ice with a selfconsistent approach". Acta Materialia 45, pp 4828-4834 (1997). 25 citations. (PDF)
23. R. Lebensohn, H. Uhlenhut, C. Hartig and H. Mecking: "Mechanical behavior gamma-TiAl-based polysinthetically twinned crystals: micromechanical modelling and experimental validation". Acta Materialia 46, pp. 4701-4709 (1998). 25 citations. (PDF)
Recent Articles (2009-2012)
70. J.P. Escobedo, E.K. Cerreta, C.P. Trujillo, D.T. Martinez, R.A. Lebensohn, V.A. Webster and G.T. Gray III: "Influence of texture and test velocity on the dynamic, high strain, tensile behavior of zirconium". Acta Materialia, 60, pp. 4379-4392 (2012). (PDF)
69. R.A. Lebensohn, M.I. Idiart, P. Ponte Castaneda: "Modeling microstructural effects in dilatational plasticity of polycrystalline materials". Procedia IUTAM 3, pp. 314-330 (2012). (PDF)
68. R.A. Lebensohn, R.A. Holt, J.A. Caro, A. Alankar and C.N. Tome: "Improved constitutive description of single crystal viscoplastic deformation by dislocation climb". Comptes Rendus Mecanique 340, pp. 289-295 (2012). (PDF)
67. A.K. Kanjarla, R.A. Lebensohn, L. Balogh and C.N. Tome: "Study of internal lattice strain distribution in stainless steel using a full-field elasto-viscoplastic formulation based on fast Fourier transforms". Acta Materialia 60, pp. 3094-3106 (2012). (PDF)
66. R.A Lebensohn, A.K. Kanjarla and P. Eisenlohr: "An elasto-viscoplastic formulation based on fast Fourier transforms for the prediction of micromechanical fields in polycrystalline materials". International Journal of Plasticity 32-33, pp. 59-69 (2012). (PDF)
65. G. Lefebvre, C.W. Sinclair, R.A. Lebensohn and J.D. Mithieux: "Accounting for local interactions in the prediction of roping of ferritic stainless steel sheets". Modelling and Simulation in Materials Science and Engineering 20, 024008 (16pp) (2012). (PDF)
64. M. Knezevic, L. Capolungo, C.N. Tome, R.A. Lebensohn, D.J. Alexander and B. Mihaila, R.J. McCabe: "Anisotropic stress-strain response and microstructure evolution of textured alpha-uranium". Acta Materialia 60, pp. 702-715 (2012). (PDF)
63. J. Segurado, R.A. Lebensohn, J. LLorca and C.N. Tome: "Multiscale modeling of plasticity based on embedding the viscoplastic self-consistent formulation in implicit finite elements". International Journal of Plasticity 28, pp. 124-140 (2012). (PDF)
62. R. Deguen, P. Cardin, S. Merkel and R.A. Lebensohn: "Texturing in the Earth's inner core due to preferential growth in its equatorial belt". Physics of the Earth and Planetary Interiors 188, pp. 173-184 (2011). (PDF)
61. M. Friak, T. Hickel, B. Grabowski, L. Lymperakis, A. Udyansky, A. Dick, D. Ma, F. Roters, L.-F. Zhu, A. Schlieter, U. Kuhn, Z. Ebrahimi, R.A. Lebensohn, D. Holec, J. Eckert, H. Emmerich, D. Raabe and J. Neugebauer: "Methodological challenges in combining quantum-mechanical and continuum approaches for materials science applications". European Physical Journal Plus 126, pp. 101-123 (2011). (PDF)
60. J.P. Escobedo, E.K. Cerreta, D. Dennis-Koller, B.M. Patterson, C. Bronkhorst, B. Hansen, D. Tonks and R.A. Lebensohn: "Effects of grain size and boundary structure on the dynamic tensile response of copper". Journal of Applied Physics 110, 033513 (2011). (PDF)
59. R.A. Lebensohn, M.I. Idiart, P. Ponte Castaneda and P.G. Vincent: "Dilatational viscoplasticity of polycrystalline solids with intergranular cavities". Philosophical Magazine 91, pp. 3038-3067 (2011). (PDF)
58. M. Montagnat, J. Blackford, S. Piazolo, L. Arnaud and R.A. Lebensohn: "Measurement and full-field prediction of deformation heterogeneities in ice". Earth and Planetary Science Letters 305, pp. 153-160 (2011). (PDF)
57. S.B. Lee, R.A. Lebensohn and A.D. Rollett: "Modeling the viscoplastic micromechanical response of two-phase materials using fast Fourier transforms". International Journal of Plasticity 27, pp. 707-727 (2011). (PDF)
56. R.A. Lebensohn, A.D. Rollett and P. Suquet: "Fast Fourier Transform-based modelling for the determination of micromechanical fields in polycrystals". Journal of the Minerals, Metals and Materials Society (JOM) 63, pp. 13-18 (2011). (PDF)
55. A. Griera, P. Bons, M.W. Jessell, R.A. Lebensohn, L. Evans and E. Gomez-Rivas: "Strain localization and porphyroclast rotation". Geology 39, pp. 275-278 (2011). (PDF)
54. B. Liu, D. Raabe, F. Roters, P. Eisenlohr and R.A. Lebensohn: "Comparison of Finite Element and fast Fourier full-field crystal plasticity solvers for texture prediction". Modelling and Simulation in Materials Science and Engineering 18, 085005 (21pp) (2010). (PDF)
53. O. Castelnau, P. Cordier, R.A. Lebensohn, S. Merkel and P. Raterron: "Microstructures and rheology of the Earth upper mantle inferred from a multiscale approach". Comptes Rendus Physique 11, pp. 304-315 (2010). (PDF)
52. A.D. Rollett, R.A. Lebensohn, M. Groeber, Y. Choi, J. Li and G.S. Rohrer: "Stress hot spots in viscoplastic deformation of polycrystals". Modelling and Simulation in Materials Science and Engineering 18, 074005 (16pp) (2010). (PDF)
51. M.E Nixon, R.A. Lebensohn, O. Cazacu and C. Liu: "Experimental and finite-element analysis of the anisotropic response of high-purity alpha-titanium in bending". Acta Materialia 58, pp. 5759-5767 (2010). (PDF)
50. M.E Nixon, O. Cazacu and R.A. Lebensohn: "Anisotropic response of high-purity alpha-titanium. Experimental characterization and constitutive modelling". International Journal of Plasticity 26, pp. 516-532 (2010). (PDF)
49. R.A. Lebensohn, C.S. Hartley, C.N. Tome and O. Castelnau: "Modelling the mechanical response of polycrystals deforming by climb and glide". Philosophical Magazine 90, pp. 567-583 (2010). (PDF)
48. A. Prakash and R.A. Lebensohn: "Simulation of micromechanical behavior of polycrystals: finite elements vs. fast Fourier transforms". Modelling and Simulation in Materials Science and Engineering 17, 064010 (16pp) (2009). (PDF)
47. R. Brenner, R.A. Lebensohn and O. Castelnau: "Elastic anisotropy and yield surface estimates of polycrystals". International Journal of Solids and Structures 46, pp. 3018-3026 (2009). (PDF)
46. R.A. Lebensohn, M. Montagnat, P. Mansuy, P. Duval, J. Meysonnier and A. Philip: "Modeling viscoplastic behavior and heterogenous intracrystalline deformation of columnar ice polycrystals". Acta Materialia, 57, pp. 1405-1415 (2009). (PDF)
New Book Chapter:
R.A. Lebensohn, P. Ponte Castaneda, R. Brenner and O. Castelnau: "Full-field vs. homogenization methods to predict microstructure-property relationships of polycrystalline materials". Chapter 11 of Computational Methods for Microstructure-Property Relationships. S Ghosh and D. Dimiduk (Eds.), Springer, pp. 393-441 (2011).
Recent and Upcoming Invited Lectures:
"Different strategies to model microstructural effects on the dilatational plastic behavior of porous polycrystalline materials". Keynote Lecture. Symposium on Homogenization Strategies for Multiphase Materials, European Solid Mechanics Conference, Graz, Austria, July 2012.
"Multiscale computational homogenization of porous polycrystalline materials". Invited Lecture. EUROMECH Colloquium on Multi-scale Computational Homogenization of Heterogeneous Structures and Materials, Marne-la-Vallee, France, March 2012.
"Micromechanical modelling of polycrystals using Fast Fourier Transforms". PRISM Seminar. Center for Prediction of Reliability, Integrity and Survivability of Microsystems (PRISM), Purdue University, West Lafayette, IN, USA, January 2012.
"FFT-based methods: towards direct input and validation of micromechanical models using 3-D microstructural data". Invited Lecture. Workshop on high-energy x-ray diffraction experiments and detailed computational analyses for understanding multiscale phenomena in crystalline materials, Advance Photon Source (APS), Chicago, IL, USA, October 2011.
"Modeling ductile damage of polycrystalline materials". Keynote Lecture. IUTAM Symposium on Linking Scales in Computations: from Microstructure to Macro-scale Properties, Pensacola, FL, USA, May 2011.
"Micromechanics of polycrystals: full-field computations and second-order homogenization approaches". GALCIT Colloquium. Graduate Aerospace Laboratories California Institute of Technology (GALCIT), Caltech, Pasadena, CA, USA, October 8, 2010.
"Crystal Plasticity Fast Fourier Transform-based formulation: theory and applications". F2M Seminar, Federation Francilienne de Mecanique (F2M), Paris, France, May 6, 2010.
"Modeling LPO evolution using crystal plasticity at conditions relevant to the Earth's interior: exploring the role of dislocation climb". Invited Talk, 2010 Gordon Research Conference on Rock Deformation, Tilton School, NH, USA, August 8-13, 2010.
Recent and Upcoming Summer Schools:
Ecole Thematique "Changement d'Echelles en Mecanique de Materiaux". Briancon (France), August 22-September 3, 2010.
Recent and Upcoming Symposia:
"Computational homogenization of single and multi-phase polycrystalline aggregates", organized by L. Delannay (UC Louvain, Belgium), J. Segurado (UP Madrid, Spain) and R.A. Lebensohn (Los Alamos, USA), within the context of IV European Congress on Computational Mechanics (ECCM IV).
Last update: August 20, 2012 - Disclaimers/Policy