11/03/2014

Workbench - Mechanical Structural Nonlinearities Metal Plasticity

The following will be covered in this Chapter:
Background Elasticity/Plasticity
Theory
Yield Criteria
Hardening Rule
Procedure
Workshop
The capabilities described in this section are generally applicable to ANSYS Structural licenses and above.
Exceptions will be noted accordingly

What is plasticity?
When a ductile material experiences stresses beyond the elastic limit, it will yield, acquiring large permanent deformations.
Plasticity refers to the material response beyond yield.
Plastic response is important for metal forming operations.
Plasticity is also important as an energy-absorbing mechanism for structures in service.
Materials that fail with little plastic deformation are said to be brittle.
Ductile response is safer in many respects than is brittle response.

This Chapter will review some basics of plasticity by defining certain terminology.

Review of Plasticity:
Plastic deformation results from slip between planes of atoms due to shear stresses (deviatoric stresses).   This dislocation motion is essentially atoms in the crystal structure rearranging themselves to have new neighbors
results in unrecoverable strains or permanent deformation after load is removed.
slipping does not generally result in any volumetric strains (condition of incompressibility), unlike elasticity

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