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Size effects under homogeneous deformation of single crystals: A discrete dislocation analysis

Submitted by PJ Guruprasad on

 doi:10.1016/j.jmps.2007.03.009

Mechanism-based discrete dislocation
plasticity is used to investigate the effect of size on micron scale
crystal plasticity under conditions of macroscopically homogeneous
deformation. Long-range interactions among dislocations are naturally
incorporated through elasticity. Constitutive rules are used which
account for key short-range dislocation interactions. These include

Research Scientist Opening on Engineering Mechanics R&D in NJ

Submitted by Jianxu Shi on

Senior Scientist – Global
Engineering and Materials Inc. has an immediate full-time opening for this
position in its NJ Office. The ideal Candidate will have demonstrated in-depth
experience in fields of computational mechanics, mechanics of composite, and
advanced structural analysis and design. Experience in commercial FEM
application and customization is considered a plus. The successful applicant
will work on physics-based modeling, thermal-mechanical analysis, and advanced
FEM solver development. Job duties will include: development of advanced FEM
algorithms, modeling and simulation using in-house and commercial software,

Mechanics of growth and rupture of abdominal aortic aneurysm

Submitted by Konstantin Volokh on

We present a coupled mathematical model of growth and failure of the abdominal aortic aneurysm (AAA). The failure portion of the model is based on the constitutive theory of softening hyperelasticity where the classical hyperelastic law is enhanced with a new constant indicating the maximum energy that an infinitesimal material volume can accumulate without failure. The new constant controls material failure and it can be interpreted as the average energy of molecular bonds from the microstructural standpoint.

Post-buckling and Snap-through Behavior of Inclined Slender Beams

Submitted by J Zhao on

In MEMS fields, a need arises in engineering practice to predict accurately the nonlinear response of slender post-buckling beams, especially the nonlinear transverse stiffness. The bistability of the post-buckling beams is excellent in reducing power consumption of micro-devices or micro-systems. However, the major difficulty in analyzing the post-buckling and snap-through response is the intractability of the geometric nonlinear control equations of large deflection beams.