UHARD | ||
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ProductsAbaqus/Standard
Elements tested
C3D8
C3D8T
Features tested
User subroutine to define isotropic hardening for Mises plasticity, the combined hardening material model, and porous metal plasticity.
Problem description
This set of verification problems tests many of the variables that are passed into UHARD, such as material properties, step times, and field variable increment data. These tests also verify that the user-defined quantities of yield stress and its derivatives are transferred properly to the solution process. These tests are modifications of the tests described in Rate-independent plasticity and Rate-dependent plasticity in Abaqus/Standard. For the problems selected from these sections, wherever an elastic-plastic material was defined, a user-defined hardening has been implemented in place of the corresponding keyword hardening definition. The structure being analyzed is a cube made of a single C3D8 element (or a C3D8T element when a coupled temperature-displacement procedure is tested).
Material:
- Elasticity
Young's modulus, E=200.0E3
Poisson's ratio, =0.3
- Plasticity
Plasticity descriptions match those of the keyword hardening descriptions in the rate-dependent and rate-independent verification problems referenced.
Results and discussion
The tests in this section are set up as cases of homogeneous deformation of a single element of unit dimensions. Consequently, the results are identical for all integration points within the element. In each case the results match those of the referenced problem with the keyword hardening description.
Problems that test adiabatic and coupled temperature-displacement procedures have density, specific heat, and the inelastic heat fraction defined as unity and conductivity defined as zero. The resulting adiabatic temperature rise is confirmed to agree with the approximate solution determined from problems run with equivalent keyword definitions of hardening.
Input files
- uhardmts.inp
Mises plasticity, uniaxial tension test. Similar to mpliho3hut.inp.
- uhardmts_pormetal.inp
Porous metal plasticity, uniaxial tension test. Similar to mpliho3hut.inp.
- uhardmts.f
User subroutine UHARD used in uhardmts.inp and uhardmts_pormetal.inp.
- uhardmta.inp
Mises plasticity, adiabatic uniaxial tension test. Similar to mpliho3hut.inp.
- uhardmta.f
User subroutine UHARD used in uhardmta.inp.
- uhardmtc.inp
Mises plasticity, coupled temperature-displacement uniaxial tension test. Similar to mpliho3hut.inp.
- uhardmtc_pormetal.inp
Porous metal plasticity, coupled temperature-displacement uniaxial tension test. Similar to mpliho3hut.inp.
- uhardmtc.f
User subroutine UHARD used in uhardmtc.inp and uhardmtc_pormetal.inp.
- uhardmss.inp
Mises plasticity, simple shear test. Similar to mpliho3gsh.inp.
- uhardmss_pormetal.inp
Porous metal plasticity, simple shear test. Similar to mpliho3gsh.inp.
- uhardmss.f
User subroutine UHARD used in uhardmss.inp and uhardmss_pormetal.inp.
- uhardcts.inp
Mises plasticity with combined hardening, uniaxial tension with temperature and field variable dependence. Similar to mplchb2hut.inp.
- uhardcts.f
User subroutine UHARD used in uhardcts.inp.
- uhardrts.inp
Rate-dependent Mises plasticity, uniaxial tension test, temperature-dependent power law. Similar to mproot3hut.inp.
- uhardrts_pormetal.inp
Porous metal plasticity, uniaxial tension test, temperature-dependent power law. Similar to mproot3hut.inp.
- uhardrts.f
User subroutine UHARD used in uhardrts.inp and uhardrts_pormetal.inp.