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) (9) (10)
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) (10)
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

  1. 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.
  2. MATX68 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 8 node brick elements with ISOLID =1 or ISOLID =2 on PSOLIDX only.
  4. When switching from a volumetric strain formulation to a strain formulation, IFLAGi = NEGSTR allows the same function definition to be retained.
  5. If one of the failure or shear failure strains is reached, the element is deleted.
  6. Transition strains define transition from initial yield stress function to residual yield stress function.
  7. 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.
  8. This card is represented as extension to a MAT9OR material in HyperMesh.