The common approach to crystal-plasticity finite element modeling for load-bearing prediction of metallic structures involves the simulation simplified grain morphology and substructure detail. This paper details a methodology predicting structure–property effect as-manufactured microstructure, including true orientation, on cyclic plasticity, fatigue crack initiation in biomedical-grade CoCr a...

Micro-scale laser shock peening LSP can potentially be applied to metallic structures in microdevices to improve fatigue and reliability performance. Copper thin films on a single-crystal silicon substrate are treated by using LSP and characterized using techniques of X-ray microdiffraction and electron backscatter diffraction (EBSD). Strain field, dislocation density, and microstructure change...

Using Molecular Dynamics (MD) computations we have reported recently a shear stiffening (hardening-like) effect in [001]-oriented defect-free iron single crystal. This makes shift the structural phase transition to particularly high pressure level under ramp compression, but not shock so that question arises about essential role of compression path and wave evolution solid state response includ...

In this paper the studies of the two-phase super Plasticity stainless steels is studied. The aim of this study obtained the suitable criteria to thermo-mechanical treatment condition for decrease the microstructure (grain size) and super plasticity property in two-phase stainless steels. Also here we want to show the appropriate ranges of temperature and strain rate used in the process super pl...

Deformation twinning is necessary for achieving strain in plastically hard directions magnesium alloys under ambient conditions, but can also contribute to void formation and crack propagation that lead early failure. This especially true instances of twin transmission between grains, which result longer continuous boundaries higher volume fractions. Coarse grain boundary particles have the pot...

*Correspondence: [email protected] 1Materials Science and Engineering Department, University of California Los Angeles, Los Angeles, California, USA 2Mechanical and Aerospace Engineering Department, University of California Los Angeles, Los Angeles, California, USA Abstract The standard way of modeling plasticity in polycrystals is by using the crystal plasticity model for single crystals in eac...

We show that slowly sheared metallic nanocrystals deform via discrete strain bursts (slips), whose size distributions follow power laws with stress-dependent cutoffs. We show for the first time that plasticity reflects tuned criticality, by collapsing the stress-dependent slip-size distributions onto a predicted scaling function. Both power-law exponents and scaling function agree with mean-fie...

In the light of recent progress in coarsening the discrete dislocation mechanics, we consider two questions relevant for the development of a mesoscale, size-dependent plasticity: (i) can the phenomenological expression for size-dependent energy, as quadratic form of Nye's dislocation density tensor, be justified from the point of view of dislocation mechanics and under what conditions? (ii) ho...