/MAT/LAW23 (PLAS_DAMA)
Block Format Keyword This law models an isotropic elastic plastic material and combines Johnson-Cook material model with a generalized damage model. The law is applicable only for solid elements.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/MAT/LAW23/mat_ID/unit_ID or /MAT/PLAS_DAMA/mat_ID/unit_ID | |||||||||
mat_title | |||||||||
E | |||||||||
a | b | n | |||||||
c | ICC | ||||||||
Et |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material
identifier. (Integer, maximum 10 digits) |
|
unit_ID | Unit Identifier. (Integer, maximum 10 digits) |
|
mat_title | Material
title. (Character, maximum 100 characters) |
|
Initial
density. (Real) |
||
E | Young's
modulus. (Real) |
|
Poisson's
ratio. (Real) |
||
a | Plasticity yield stress -
should be strictly positive. (Real) |
|
b | Plasticity hardening
parameter. (Real) |
|
n | Plasticity hardening
exponent. 3 (Real) |
|
Failure plastic
strain. Default = 1030 (Real) |
||
Plasticity maximum
stress. Default = 1030 (Real) |
||
c | Strain rate coefficient.
Default = 0.00 (Real) |
|
Reference strain
rate. If , no strain rate effect. (Real) |
||
ICC | Strain rate computation
flag. 5
(Integer) |
|
Damage model starts at
. Default = 0.15 (Real) |
||
Et | Softening damage slope (
). Default = 0.00 (Real) |
Example (Aluminum)
#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
g mm ms
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#- 2. MATERIALS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/LAW23/1/1
Alu
# RHO_I
.0027
# E nu
70000 .3
# a b n Eps_max sig_max0
100 0 1 .2 100
# c EPS_0 ICC
0 0 0
# EPS_dam E_t
.1 -2000
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#ENDDATA
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
- The damage law is applied to the stress tensor and damage occurs in tension, compression and shear.
- The input is the same as material law (/MAT/LAW22 (DAMA)).
- The plasticity hardening exponent n must be less than one.
- When reaches , in one integration point, then the solid element is deleted.
- ICC is a flag of the strain
rate effect on material maximum stress
.