Up to 3 material user’s laws (law 29, 30 and 31) can be defined for 3D, 2D solid elements and 3D shell elements. User’s
laws for beam or truss elements are not available.
This subroutine calculates the stress tensor versus the strain tensor, strain rate tensor, density, volume, internal
energy, or user-defined variables.
Up to 3 material user’s laws (law 29, 30 and 31) can be defined for 3D, 2D solid elements and 3D shell elements. User’s
laws for beam or truss elements are not available.
A Johnson-Cook elasto-plastic material law is defined for shell elements. Input user
data includes density, Young’s modulus, Poisson ratio, yield stress, hardening
parameters, hardening modulus, maximum stress, and maximum strain.
The Johnson Cook model:(1)
Maximum stress and plastic strain are taken into account. Shell thickness is
variable.
Two methods are available to compute plastically admissible stresses:
Projection by return radial
Iterative projection with three Newton iterations
Example Demo Files
Before you begin, copy the file(s) used in this problem
to your working directory.