MATX60
Bulk Data Entry Defines additional material properties for piece-wise nonlinear elastic-plastic material for geometric nonlinear analysis.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
MATX60 | MID | EPSPF | EPST1 | EPST2 | FSMOOTH | CHARD | FCUT | EPSF | |
TPID | PSCA |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
TID1 | FSCA1 | EPSR1 | |||||||
TID2 | FSCA2 | EPSR2 | |||||||
etc | etc | etc |
Example
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
MAT1 | 102 | 900 | 0.33 | 1E1 | |||||
MATX60 | 102 | ||||||||
101 | 1.0 | 4.2E-7 | |||||||
102 | 1.0 | 4.2e6 |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
MID | Material ID of the
associated MAT1. 1 No default (Integer > 0) |
|
EPSPF | Failure plastic
strain. Default = 1030 (Real > 0) |
|
EPST1 | Maximum tensile
failure strain. 5 Default = 1030 (Real > 0) |
|
EPST2 | Maximum tensile
failure damage. 6 Default = 2.0*1030 (Real > 0) |
|
FSMOOTH | Strain rate smoothing
flag.
|
|
CHARD | Hardening
coefficient.
(1.0 ≥ Real ≥ 0) |
|
FCUT | Cutoff frequency for
strain rate filtering. Only for shell and solid
elements. Default = 1030 (Real ≥ 0) |
|
EPSF | Tensile strain for
element deletion. Default = 3.0*1030 (Real > 0) |
|
TPID | Identification number
of a TABLES1 that defines pressure dependent
yield stress function. No default (Integer > 0) |
|
PSCA | Scale factor for
stress in pressure dependent function. Default = 1.0 (Real) |
|
TIDi | Identification number
of a TABLES1 that defines the yield stress
versus plastic strain rate function corresponding to
EPSRi. Separate functions must be defined
for different strain rates. No default (Integer > 0) |
|
FSCAi | Scale factor for
TIDi. Default = 1.0 (Real) |
|
EPSRi | Strain rate. Strain
rate values must be given strictly in ascending
order. (Real) |
Comments
- The material identification number must be that of an existing MAT1 Bulk Data Entry. Only one MATX60 material extension can be associated with a particular MAT1.
- MATX60 is only applied in geometric nonlinear analysis subcases which are defined by ANALYSIS = EXPDYN. It is ignored for all other subcases.
- The first point of yield stress functions (plastic strain versus stress) should have a plastic strain value of zero. If the last point of the first (static) function equals 0 in stress, the default value of EPSMAX is set to the value of the corresponding plastic strain.
- When the plastic strain reaches EPSMAX, the element is deleted.
- If the first principal strain
1 reaches
t1 (EPST1),
the stress
is reduced by:
(1) 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.
- Strain rate filtering is used to smooth strain rates. The input FCUT is available only for shell and solid elements.
- Hardening is defined by
ICH.
- The kinematic hardening model is not available with global formulation (NIP = 0 on PSHELX), that is hardening is fully isotropic.
- In case of kinematic hardening and strain rate dependency, the yield stress depends on the strain rate.
- TPID is used to distinguish the behavior in tension and compression for certain materials (that is pressure dependent yield). This is available for solid elements only. The effective yield stress is then obtained by multiplying the nominal yield stress by the yield factor PSCA corresponding to the actual pressure.
- If
(
=EPSRn), yield stress is a cubic
interpolation between functions
fn-1,
fn,
fn+1 and fn+2.
If , yield stress is interpolated between functions f1, f2, and f3.
If , where Nfunc is the function number for strain rate, yield is extrapolated between functions fNfunc-3, fNfunc-2, fNfunc-1 and fNfunc.
If , yield is extrapolated between functions fNfunc-2, fNfunc-1, and fNfunc.
- Strain rate values must be given strictly in ascending order. Separate functions must be defined for different strain rates.
- This card is represented as an extension to a MAT1 material in HyperMesh.