MATX28

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)
MATX28 MID                
  TIID11 TIID22 TIID33 IFLAG1 FSCAI11 FSCAI22 FSCAI33    
  EPSFI11 EPSFI22 EPSFI33            
  TIID12 TIID23 TIID31 IFLAG2 FSCAI12 FSCAI23 FSCAI31    
  EPSFI12 EPSFI23 EPSFI31            

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          
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            

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 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. 5
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 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.
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)

  

Comments

  1. The material identification number must be that of an existing MAT9OR Bulk Data Entry. Only one MATX28 material extension can be associated with a particular MAT9OR.
  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 I = 1, 2, or 12 on PSOLIDX card.
  4. This law is not compatible with I = 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 MAT9OR material in HyperMesh.