MATX68

Bulk Data Entry 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)
MATX68	`MID`
	`TIID11`	`TIID22`	`TIID33`	`IFLAG1`	`FSCAI11`	`FSCAI22`	`FSCAI33`
	`EPSFI11`	`EPSFI22`	`EPSFI33`
	`TIID12`	`TIID23`	`TIID31`	`IFLAG2`	`FSCAI12`	`FSCAI23`	`FSCAI31`
	`EPSFI12`	`EPSFI23`	`EPSFI31`
	`TIID21`	`TIID32`	`TIID13`		`FSCAI21`	`FSCAI32`	`FSCAI13`
	`TRID11`	`TRID22`	`TRID33`		`FSCAR11`	`FSCAR22`	`FSCAR33`
	`EPST11`	`EPST22`	`EPST33`
	`TRID12`	`TRID23`	`TRID31`		`FSCAR12`	`FSCAR23`	`FSCAR31`
	`EPST12`	`EPST23`	`EPST31`
	`TRID21`	`TRID32`	`TRID13`		`FSCAR21`	`FSCAR32`	`FSCAR13`

Example

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
MAT9OR	102	0.2	0.02	0.02	0.33	0.33	0.33	0.286E-7
		0.1	0.01	0.1
MATX68	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
	21	32	13		1.0	1.0	1.0
	11	22	33		1.0	1.0	1.0
	0.8	0.0	0.0
	12	23	31		1.0	1.0	1.0
	0.0	0.0	0.0
	21	32	13		1.0	1.0	1.0

Definitions

Field	Contents	SI Unit Example
`MID`	Material ID of the associated `MAT9OR`. 1 No default (Integer > 0)
`TIID11`	Identification number of a TABLES1 that defines initial yield stress function in direction 11. No default (Integer > 0)
`TIID22`	Identification number of a TABLES1 that defines initial yield stress function in direction 22. No default (Integer > 0)
`TIID33`	Identification number of a TABLES1 that defines initial yield stress function in direction 33. No default (Integer > 0)
`IFLAG1`	Strain formulation for yield functions 11, 22, and 33. 4 VOLSTR (Default) 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 initial shear yield stress function in direction 12. No default (Integer > 0)
`TIID23`	Identification number of a TABLES1 that defines Initial shear yield stress function in direction 23. No default (Integer > 0)
`TIID31`	Identification number of a TABLES1 that defines Initial shear yield stress function in direction 31. No default (Integer > 0)
`IFLAG2`	Strain formulation for yield functions 12, 23, and 31. VOLSTR (Default) 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)
`TIID21`	Identification number of a TABLES1 that defines Initial shear yield stress function in direction 21. No default (Integer > 0)
`TIID32`	Identification number of a TABLES1 that defines Initial shear yield stress function in direction 32. No default (Integer > 0)
`TIID13`	Identification number of a TABLES1 that defines Initial shear yield stress function in direction 13. No default (Integer > 0)
`FSCAI21`	Scale factor on initial shear yield stress function in direction 21. Default = 1.0 (Real)
`FSCAI32`	Scale factor on initial shear yield stress function in direction 32. Default = 1.0 (Real)
`FSCAI13`	Scale factor on initial shear yield stress function in direction 13. Default = 1.0 (Real)
`TRID11`	Identification number of a TABLES1 that defines residual yield stress function in direction 11. No default (Integer > 0)
`TRID22`	Identification number of a TABLES1 that defines residual yield stress function in direction 22. No default (Integer > 0)
`TRID33`	Identification number of a TABLES1 that defines residual yield stress function in direction 33. No default (Integer > 0)
`FSCAR11`	Scale factor on residual yield stress function in direction 11. Default = 1.0 (Real)
`FSCAR22`	Scale factor on residual yield stress function in direction 22. Default = 1.0 (Real)
`FSCAR33`	Scale factor on residual yield stress function in direction 33. Default = 1.0 (Real)
`EPST11`	Transition strain in direction 11. (Real)
`EPST22`	Transition strain in direction 22. (Real)
`EPST33`	Transition strain in direction 33. (Real)
`TRID12`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 12. No default (Integer > 0)
`TRID23`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 23. No default (Integer > 0)
`TRID31`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 31. No default (Integer > 0)
`FSCAR12`	Scale factor on residual shear yield stress function in direction 12. Default = 1.0 (Real)
`FSCAR23`	Scale factor on residual shear yield stress function in direction 23. Default = 1.0 (Real)
`FSCAR31`	Scale factor on residual shear yield stress function in direction 31. Default = 1.0 (Real)
`EPST12`	Transition strain in direction 12. (Real)
`EPST23`	Transition strain in direction 23. (Real)
`EPST31`	Transition strain in direction 31. (Real)
`TRID21`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 21. No default (Integer > 0)
`TRID32`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 32. No default (Integer > 0)
`TRID13`	Identification number of a TABLES1 that defines residual shear yield stress function in direction 13. No default (Integer > 0)
`FSCAR21`	Scale factor on residual shear yield stress function in direction 21. Default = 1.0 (Real)
`FSCAR32`	Scale factor on residual shear yield stress function in direction 32. Default = 1.0 (Real)
`FSCAR13`	Scale factor on residual shear yield stress function in direction 13. Default = 1.0 (Real)

Comments

The material identification number must be that of an existing MAT9OR Bulk Data Entry. Only one MATX68 material extension can be associated with a particular MAT9OR.
MATX68 is only applied in geometric nonlinear analysis subcases which are defined by ANALYSIS = EXPDYN. It is ignored for all other subcases.
This law is compatible with 8 node brick elements with I =1 or I =2 on PSOLIDX only.
When switching from a volumetric strain formulation to a strain formulation, IFLAGi = NEGSTR allows the same function definition to be retained.
If one of the failure or shear failure strains is reached, the element is deleted.
Transition strains define transition from initial yield stress function to residual yield stress function.
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 neighbor elements.
This card is represented as extension to a MAT9OR material in HyperMesh.