**Dr. Ricardo A.
Lebensohn**

**Scientist
and Team Leader, Materials Science and Technology Division, Los Alamos National
Laboratory**

__Contact__

** Address:** MST8, MS G755, Los
Alamos, NM, 87545, USA

** Phone
#:**
+1-505-665-3035

** Fax #:** +1-505-667-8021

*e-mail*** :** lebenso@lanl.gov

** Webpage: **http://public.lanl.gov/lebenso

*ResearcherID*** **(papers, citations, h-index):

__Education__

**1989:** *Licenciado** en Fisica*,
Faculty of Science and Engineering (FCEIA), Universidad Nacional de Rosario
(UNR), Argentina.

**1993:** PhD in Physics,
FCEIA, UNR, Rosario, Argentina.

__Awards__

**2016:** Otto Moensted Visiting
Professorship at the Danish Technical University (DTU), Otto Moensted Foundation, Denmark.

**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.

**Previous
Positions, Visiting Positions**

__Research Interests__

Mechanics of Materials. Computational
Mechanics. Solid Mechanics. Micromechanics.
Polycrystal Plasticity. Dilatational Plasticity.
Strain-gradient Plasticity. Homogenization.
Spectral Methods. Multiscale
Material Modelling. Texture, Anisotropy,
Microstructure and Damage Evolution of Metals, Minerals and Polymers. X-Ray Diffraction. High Energy Diffraction
Microscopy. Neutron Diffraction. Residual Stresses. Finite Element
Analysis. Metal Forming. Dynamic
Properties of Materials.

__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 ...

__Most-cited
Articles__

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). 999 citations in Web of Science/ResearcherID. (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). 288 citations. (PDF)

3. R.A. Lebensohn: "N-site modelling of
a 3D viscoplastic polycrystal
using Fast Fourier Transform". Acta Materialia 49, pp 2723-2737 (2001).
173 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). 152
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). 131 citations. (PDF)

6. 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). 129
citations. (PDF)

7. 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). 117
citations. (PDF)

8. 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). 88
citations. (PDF)

9. 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). 80
citations. (PDF)

10. 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).
80 citations. (PDF)

11.
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). 78 citations. (PDF)

12. 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).
75 citations. (PDF)

13. 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). 73 citations. (PDF)

14. 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).
72 citations. (PDF)

15.
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). 66 citations. (PDF)

16. 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). 62 citations. (PDF)

17. 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). 58 citations. (PDF)

18. P. Eisenlohr, M. Diehl, R.A. Lebensohn
and F. Roters: "A spectral method solution to crystal elasto-viscoplasticity
at finite strains". International Journal of Plasticity
46, pp. 37-53 (2013). 56 citations, highly cited
paper in Essential Science Indicators (ESI). (PDF)

19. M. Knezevic, R.A. Lebensohn, O. Cazacu, B. Revil-Baudard, G. Proust, S. Vogel and M.E.
Nixon: "Modeling bending of alpha-titanium with embedded polycrystal plasticity in implicit finite elements".
Materials Science and Engineering A 564, pp. 116-126
(2013). 53 citations. (PDF)

20. M. Knezevic, R.J. McCabe, C.N. Tome, R.A.
Lebensohn, S.R. Chen, C.M. Cady, G.T. Gray III and B. Mihaila:
"Modeling mechanical response and texture evolution of alpha-uranium as a
function of strain rate and temperature using polycrystal
plasticity". International Journal of Plasticity 43, pp.
70-84 (2013). 51 citations, highly cited paper
in ESI. (PDF)

21. M. Knezevic, R.J. McCabe, R.A. Lebensohn,
C.N. Tome, C. Liu and B. Mihaila: "Integration
of self-consistent polycrystal plasticity with
dislocation density based hardening laws within an implicit finite element
framework: application to low-symmetry metals". Journal
of the Mechanics and Physics of Solids 61, pp. 2034-2046 (2013). 49 citations, highly cited paper in ESI. (PDF)

22. 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). 46 citations. (PDF)

23.
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).
41 citations. (PDF)

24.
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). 41 citations. (PDF)

25.
R.A Lebensohn, H.-R. Wenk and C.N. Tome: "Modelling deformation and
recrystallization textures in calcite". Acta Materialia
46, pp 2683-2693 (1998). 40
citations. (PDF)

26.
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). 39 citations. (PDF)

27. 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). 38 citations. (PDF)

28. 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). 37 citations. (PDF)

29. 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).
36 citations*.* (PDF)

30. 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). 34
citations*.* (PDF)

31. 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). 34 citations. (PDF)

32.
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)

33. R.A. Lebensohn, O. Castelnau,
R. Brenner and P. Gilormini: "Study of the antiplane deformation of linear 2-D polycrystals
with different microstructures". International Journal
of Solids and Structures 42, pp. 5441-5459 (2005). 33 citations. (PDF)

34. 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). 33
citations. (PDF)

35. 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).
33 citations. (PDF)

36.
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). 33 citations. (PDF)

__Recent
Articles (2015-2016)__

112. R.A. Lebensohn and A. Needleman:
"Numerical implementation of non-local polycrystal
plasticity using Fast Fourier Transforms". Journal of
the Mechanics and Physics of Solids, in press. DOI:
10.1016/j.jmps.2016.03.023 (PDF)

111. P. Kaercher, L. Miyagi, W. Kanitpanyacharoen, E. Zepeda-Alarcon, Y. Wang, D.
Parkinson, R.A. Lebensohn, F. De Carlo and H.R. Wenk: "Two-phase
deformation of lower mantle mineral analogs". Earth and
Planetary Science Letters 456, pp. 134-145 (2016). (PDF)

110. M.V. Upadhyay, S. Van Petegem, T. Panzner, R.A.
Lebensohn and H. Van Swygenhoven: "Study of lattice strain evolution
during biaxial deformation of stainless steel using a finite element and fast
Fourier transform based multiscale approach". Acta Materialia
118, pp. 28-43 (2016). (PDF)

109. M.-G. Llorens, A. Griera, P.D. Bons,
R.A. Lebensohn, L. Evans, D. Jensen and I. Weikusat: "Full-field
predictions of ice dynamic recrystallisation under
simple shear conditions". Earth and Planetary Science
Letters 450, pp. 233-242 (2016). (PDF)

108. E. Lieberman, R.A. Lebensohn, D.B. Menasche,
C.A. Bronkhorst and A.D. Rollett: "Microstructural effects on damage
evolution in shocked copper polycrystals". Acta Materialia 116, pp. 270-280 (2016). (PDF)

107. M.V. Upadhyay, L. Capolungo, V. Taupin,
C. Fressengeas and R.A. Lebensohn: "A higher order elasto-viscoplastic
model using fast Fourier transforms: effects of lattice curvatures on
mechanical response of nanocrystalline metals". International Journal of Plasticity 83, pp. 126-152 (2016).
(PDF)

106. M. Knezevic, M. Zecevic, I.J. Beyerlein
and R.A. Lebensohn: "A numerical procedure enabling accurate descriptions
of strain rate-sensitive flow of polycrystals within
crystal visco-plasticity theory". Computer Methods in Applied Mechanics and Engineering 308, pp.
468-482 (2016). (PDF)

105. M.-G. Llorens, A. Griera, P.D. Bons, J. Roessiger, R. Lebensohn, L. Evans and I. Weikusat:
"Dynamic recrystallization of ice aggregates during co-axial viscoplastic deformation: a numerical approach". Journal of Glaciology 62, pp. 359-377 (2016). (PDF)

104. B.M. Morrow, R.A Lebensohn, D.T.
Martinez, C.P. Trujillo, F.L. Addessio, C.A. Bronkhorst, T. Lookman and E.K.
Cerreta: "Characterization and modelling of mechanical behavior of single
crystal titanium deformed by split Hopkinson pressure bar", International
Journal of Plasticity 82, pp. 225-240 (2016). (PDF)

103. G. Stevens, S. Atamturktur,
R.A. Lebensohn and G. Kaschner: "Experiment-based validation and
uncertainty quantification of coupled multi-scale plasticity models". Multidiscipline Modeling in Materials and Structures 12, pp. 151-176
(2016). (PDF)

102. A.W. Mello, A. Nicolas, R.A. Lebensohn
and M.D. Sangid: "Microstructure based strain localization within a 7050
Aluminum alloy: comparison of experiments and modeling in various
textures". Materials Science and Engineering A
661, pp. 187-197 (2016). (PDF)

101. R.A. Lebensohn, M. Zecevic, M. Knezevic
and R.J. McCabe: "Average intragranular misorientation trends in polycrystalline materials
predicted by a viscoplastic self-consistent
approach", Acta Materialia
104, pp. 228-236 (2016). (PDF)

100. T. Ozturk, C. Stein, R. Pokharel, C. Hefferan, H. Tucker, S. Jha, R.
John, R.A. Lebensohn, P. Kenesei, R.M. Suter and A.D.
Rollett: "Simulation domain size requirements for elastic response of 3-D
polycrystalline materials". Modelling and Simulation in
Materials Science and Engineering 24, 015006 (13pp) (2016). (PDF)

99. C.W. Sinclair, G. Martin and R.A.
Lebensohn: "Factors contributing to plastic strain amplification in
slip-dominated deformation of magnesium alloys". Modelling
and Simulation in Materials Science and Engineering 23, 085002 (17pp) (2015).
(PDF)

98. A. Rovinelli, R.A. Lebensohn and M.D.
Sangid: "Influence of microstructure variability on short crack behavior
through postulated micromechanical short crack driving force metrics". Engineering Fracture Mechanics 138, pp. 265-288 (2015). (PDF)

97. E. Lieberman, A.D. Rollett, R.A.
Lebensohn and E.M. Kober: "Calculation of grain boundary normals directly from 3-D microstructure images". Modelling and Simulation in Materials Science and Engineering 23,
035005 (18pp) (2015). (PDF)

96. S. Atamturktur,
J. Hegenderfer, B. Williams, M. Egeberg,
R.A. Lebensohn and C. Unal: "A resource
allocation framework for experiment-based validation of numerical models".
Mechanics of Advanced Materials and Structures 22, 641-654
(2015). (PDF)

95. A. Prakash, W. Nohring,
R.A. Lebensohn, H.W. Hoppel and E. Bitzek: "Finite element simulation of the accumulative
roll bonding process using an embedded texture model". Materials Science
and Engineering A 631, pp. 104-119 (2015). (PDF)

94. N. Chandola,
R.A. Lebensohn, B. Revil-Baudard, O. Cazacu, R.K.
Mishra and F. Barlat: "Combined effects of anisotropy and
tension-compression asymmetry on the torsional response of AZ31 Mg". International Journal of Solids and Structures 58, pp. 190-200
(2015). (PDF)

93. L. Chen, J. Chen, R.A. Lebensohn, Y.Z.
Ji, T. W. Heo, S. Bhattacharyya, K. Chang, S.
Mathaudhu, Z.K. Liu and L.Q. Chen: "An integrated fast Fourier
transform-based phase-field and crystal plasticity approach to model
recrystallization of three dimensional polycrystals".
Computer Methods in Applied Mechanics and Engineering 285,
pp. 829-848 (2015). (PDF)

92. M. Arul Kumar, A.K. Kanjarla,
S. Niezgoda, R.A. Lebensohn and C.N. Tome: "Numerical study of the stress
state of a deformation twin in magnesium", Acta Materialia 84, pp. 349-358 (2015). (PDF)

91. R. Pokharel, J. Lind, S.F. Li, P. Kenesei, R.A. Lebensohn, R.M. Suter and A.D. Rollett:
"In-situ observation of bulk 3-D microstructure evolution of
polycrystalline Cu using synchrotron radiation". International
Journal of Plasticity 67, pp. 217-234 (2015). (PDF)

90. N.R. Barton, J.V.
Bernier, R.A. Lebensohn and D.E. Boyce: "The use of discrete harmonics in
direct multi-scale embedding of polycrystal
plasticity". Computer Methods in Applied Mechanics and
Engineering 283, 224-242 (2015). (PDF)

**Articles in Peer-Reviewed International Journals (full
list, 113)**

**Articles in Proceedings of International
Conferences (51)**

__News:__

__Ricardo Lebensohn receives Humboldt
Research Award__

__Ricardo
Lebensohn joins to the Editorial Board of International Journal of Plasticity__

__Recent Book Chapters:__** **

R.A. Lebensohn:
"Elastic and viscoplastic properties".
Chapter 11 of: State-of-the-art
Report of Techniques for Fuel Modelling. OECD/NEA Working
Party on Multi-scale Modelling of Fuels and Structural Materials for Nuclear Systems
(2015).

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: __

__Recent____ and Upcoming Summer Schools:__

__Recent and Upcoming
Symposia:__

__Last
update__: September 2016 - Disclaimers/Policy