A Hybrid Multi-Scale Model of Crystal Plasticity for Handling Stress Concentrations

作者：Sun Shang; Ramazani Ali^*; Sundararaghavan Veera

来源：Metals, 2017, 7(9): 345.

DOI：10.3390/met7090345

• plastic deformation
• texture
• finite element analysis
• simulation
• theory

Microstructural effects become important at regions of stress concentrators such as notches, cracks and contact surfaces. A multiscale model is presented that efficiently captures microstructural details at such critical regions. The approach is based on a multiresolution mesh that includes an explicit microstructure representation at critical regions where stresses are localized. At regions farther away from the stress concentration, a reduced order model that statistically captures the effect of the microstructure is employed. The statistical model is based on a finite element representation of the orientation distribution ODF). As an illustrative example, we have applied the multiscaling method to compute the stress intensity factor K-1 around the crack tip in a wedge-opening load specimen. The approach is verified with an analytical solution within linear elasticity approximation and is then extended to allow modeling of microstructural effects on crack tip plasticity.

• 出版日期2017-9