Crystal Plasticity: How Grains Share Deformation
Connect slip systems, grain orientation and local stress to the deformation of polycrystalline metals.
From single crystal to component
Crystal plasticity describes deformation by tracking slip on crystallographic systems inside differently oriented grains. It bridges dislocation mechanisms and component-scale constitutive response.
Resolved shear stress
A slip system activates when the resolved shear stress reaches a critical value. Grain orientation therefore controls which systems carry strain and how neighbouring grains constrain one another.
Why grains interact
A polycrystal must remain geometrically compatible. Hard and soft orientations redistribute load, creating local stress concentrations near boundaries and triple junctions.
What models provide
Crystal-plasticity finite-element models predict texture evolution, strain localisation and anisotropy. Their value depends on reliable slip laws, boundary conditions and orientation data.
Engineering takeaway
Use crystal plasticity when average stress–strain curves hide orientation-sensitive localisation, fatigue initiation or forming limits.