•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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