MATX28

Bulk Data Entry

MATX28 – Material Property Extension for Honeycomb Material for Geometric Nonlinear Analysis

Description

Defines additional material properties for Honeycomb material for geometric nonlinear analysis. This law is only applicable to solid elements.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
MATX28	MID
	TIID11	TIID22	TIID33	IFLAG1	FSCAI11	FSCAI22	FSCAI33
	EPSFI11	EPSFI22	EPSFI33
	TIID12	TIID23	TIID31	IFLAG2	FSCAI12	FSCAI23	FSCAI31
	EPSFI12	EPSFI23	EPSFI31

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
MAT9ORT	102	0.2	0.02	0.02	0.33	0.33	0.33	0.286E-7
		0.1	0.01	0.1
MATX28	102
	11	22	33	NEGSTR	1.0	1.0	1.0
	0	0	0
	12	23	31	NEGSTR	1.0	1.0	1.0
	0.0	0.0	0.0

Field	Contents
MID	Material ID of the associated MAT9ORT. See comment 1. No default (Integer > 0)
TIID11	Identification number of a TABLES1 that defines the initial yield stress function in direction 11. No default (Integer > 0)
TIID22	Identification number of a TABLES1 that defines the initial yield stress function in direction 22. No default (Integer > 0)
TIID33	Identification number of a TABLES1 that defines the initial yield stress function in direction 33. No default (Integer > 0)
IFLAG1	Strain formulation for yield functions 11, 22, and 33. See comment 5. Default = VOLSTR (VOLSTR, STR, or NEGSTR) VOLSTR - Yield stress is a function of volumetric strains. STR - Yield stress is a function of strains. NEGSTR - Yield stress is a function of negative strains.
FSCAI11	Scale factor on initial yield stress function in direction 11. Default = 1.0 (Real)
FSCAI22	Scale factor on initial yield stress function in direction 22. Default = 1.0 (Real)
FSCAI33	Scale factor on initial yield stress function in direction 33. Default = 1.0 (Real)
EPSFI11	Initial failure strain under tension or compression in direction 11. (Real)
EPSFI22	Initial failure strain under tension or compression in direction 22. (Real)
EPSFI33	Initial failure strain under tension or compression in direction 33. (Real)
TIID12	Identification number of a TABLES1 that defines the initial shear yield stress function in direction 12. No default (Integer > 0)
TIID23	Identification number of a TABLES1 that defines the initial shear yield stress function in direction 23. No default (Integer > 0)
TIID31	Identification number of a TABLES1 that defines the initial shear yield stress function in direction 31. No default (Integer > 0)
IFLAG2	Strain formulation for yield functions 12, 23, and 31. Default = VOLSTR (VOLSTR, STR, or NEGSTR) VOLSTR - Yield stress is a function of volumetric strains. STR - Yield stress is a function of strains. NEGSTR - Yield stress is a function of negative strains.
FSCAI12	Scale factor on initial shear yield stress function in direction 12. Default = 1.0 (Real)
FSCAI23	Scale factor on initial shear yield stress function in direction 23. Default = 1.0 (Real)
FSCAI31	Scale factor on initial shear yield stress function in direction 31. Default = 1.0 (Real)
EPSFI12	Initial failure strain under tension or compression in direction 12. (Real)
EPSFI23	Initial failure strain under tension or compression in direction 23. (Real)
EPSFI31	Initial failure strain under tension or compression in direction 31. (Real)

Comments

1.	The material identification number must be that of an existing MAT9ORT bulk data entry. Only one MATX28 material extension can be associated with a particular MAT9ORT.

2.	MATX28 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 compatible with 10 node tetrahedron elements, and it is compatible with ISOLID = 1, 2, or 12 on PSOLIDX card.

4.	This law is not compatible with IFRAME = OFF, if it is referenced by the PSOLIDX card.

5.	When switching from a volumetric strain formulation to a strain formulation, IFLAGi = NEGSTR allows the same function definition to be retained.

6.	If one of the failure or shear failure strains is reached, the element is deleted.

7.	Transition strains define transition from initial yield stress function to residual yield stress function.

8.	If one of the transition or shear transition strains is reached, the element has yield stress described by residual functions in each direction. Transition is applied to the neighboring elements.

9.	This card is represented as an extension to a MAT9ORT material in HyperMesh.