MATX27

Bulk Data Entry

MATX27 – Material Property Extension for Elastic-Plastic Brittle Material for Geometric Nonlinear Analysis

Description

Defines additional material properties for elastic-plastic brittle material for geometric nonlinear analysis.

Format

Field	Contents
MID	Material ID of the associated MAT1. See comment 1. No default (Integer > 0)
A	Plasticity yield stress. (Real > 0)
B	Plasticity hardening parameter. (Real > 0)
N	Plasticity hardening exponent. Default = 1.0 (Real < 1.0)
EPSMAX	Failure plastic strain εmax Default = 1030 (Real > 0)
SIGMAX	Maximum plastic stress σmax0 Default = 1030 (Real > 0)
C	Strain rate coefficient. Default = 0.0 (Real)
DEPS0	Reference strain rate . Default = 0.0 (Real) If DESPS < DESPS0, no strain rate effect.
ICC	Strain rate dependency of σmax flag . See comment 4. Default = ON (ON or OFF)
EPS1	Tensile failure strain in principal strain direction 1. Default = 1.0*1030 (Real > 0)
EPS1MAX	Maximum tensile failure strain in principal strain direction 1. Default = 1.1*1030 (Real > 0)
DMAX1	Maximum tensile failure damage in principal strain direction 1. Default = 0.999 (Real > 0)
EPSD1	Tensile strain for element deletion in principal strain direction 2. Default = 1.2*1030 (Real > 0)
EPS2	Tensile failure strain in principal strain direction 2. Default = 1.0*1030 (Real > 0)
EPS2MAX	Maximum tensile failure strain in principal strain direction 2. Default = 1.1*1030 (Real > 0)
DMAX2	Maximum tensile failure damage in principal strain direction 2. Default = 0.999 (Real > 0)
EPSD2	Tensile strain for element deletion in principal strain direction 2. Default = 1.2*1030 (Real > 0)

1.	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.

2.	MATX27 is only applied in geometric nonlinear analysis subcases which are defined by ANALYSIS = EXPDYN. It is ignored for all other subcases.

3.	This law is only applicable with shell elements. The isotropic elasto-plastic model is the same as with MATX02. However, MATX27 allows material damage and brittle failure to be modeled.

4.	ICC controls the strain rate effect.

matx02

matx02_eq3

5.	The failure plastic strain EPSMAX has no effect if the second continuation is defined.

6.	An element is removed if one layer reaches the tensile failure strain EPS1.

matx27_eq

7.	This card is represented as an extension to a MAT1 material in HyperMesh.