MATX44
Bulk Data Entry Defines additional material properties for Cowper-Symonds elastic-plastic material for geometric nonlinear analysis.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
MATX44 | MID | A | B | N | ICH | SIGMAX | C | P | |
ICC | FSMOOTH | FCUT | EPSMAX | EPST1 | EPST2 |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
MAT1 | 144 | 0.11 | 0.11 | 9.92E-07 | |||||
MATX44 | 144 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
MID | Material ID of the
associated MAT1. No default (Integer > 0) |
|
A | Plasticity yield
stress. (Real > 0) |
|
B | Plasticity hardening
parameter. (Real ≥ 0) |
|
N | Plasticity hardening
exponent. Default = 1.0 (Real) |
|
ICH | Hardening coefficient.
(Real ≥ 0) |
|
SIGMAX | Maximum plastic stress
. Default = 1030 (Real > 0) |
|
C | Strain rate
coefficient. Default = 0.0 (Real) |
|
P | Strain rate
exponent. Default = 1.0 (Real) |
|
ICC | Strain rate dependency
of
flag. 5
|
|
FSMOOTH | Strain rate smoothing
flag.
|
|
FCUT | Cutoff frequency for
strain rate filtering. Default = 1030 (Real ≥ 0) |
|
EPSMAX | Failure plastic
strain. Default = 1030 (Real > 0) |
|
EPST1 | Tensile rupture strain
1. Default = 1030 (Real > 0) |
|
EPST2 | Tensile rupture strain
2. Default = 2.0 * 1030 (Real > 0) |
Comments
- The material identification number must be that of an existing MAT1 Bulk Data Entry. Only one MATXi material extension can be associated with a particular MAT1.
- MATX44 is only applied in geometric nonlinear analysis subcases which are defined by ANALYSIS = EXPDYN. It is ignored for all other subcases.
- The Cowper-Symonds models an
elastic-plastic material, only for solids and shells. The basic principle is the
same as the standard Johnson-Cook model; the only difference between the two
lies in the expression for strain rate effect on flow stress.
(1) with being plastic strain, and being the strain rate.
- Hardening is defined by
ICH.
- ICC controls the strain rate effect.
- No strain rate effects are considered in rod elements.
- Strain rate filtering is used to smooth strain rates. The input FCUT is available only for shell and solid elements.
- When the plastic strain reaches EPSMAX, the element is deleted.
-
if the first principal strain
1 reaches t1 =
EPST1, the stress
is reduced by:
(2) with t2 = EPST2.
- If the first principal strain 1 reaches t2 = EPST2, the stress is reduced to 0 (but the element is not deleted).
- If the first principal strain 1 reaches f = EPSF, the element is deleted.
- This card is represented as an extension to a MAT1 material in HyperMesh.