DMGINI

Bulk Data Entry Defines the damage initiation criteria.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI DMGINIID CRI   FLAT LODE        
  Y1 X1_1 X1_2 X1_3          
  Y2 X2_1 X2_2 X3_3          
  Y3 X3_1 X3_2 X3_3          
  etc. etc. etc. etc.          

Example 1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 20 MAXS              
  20.0 50.0 50.0            

Example 2

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 22 QUADE              
  2.0E-3 2.4E-3 2.4E-3            

Example 3

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 22 DUCTILE              
  0.03                

Example 4

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 22 DUCTILE   FLAT          
  1.5 -0.33 0.0            
  0.25 0.0 0.0            
  0.12 0.667 0.0            
  0.75 -0.33 1000.0            
  0.125 0.0 1000.0            
  0.06 0.667 1000.0            

Example 5 (Ductile damage initiation with LODE)

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 22 DUCTILE   FLAT LODE        
  1.5 -0.33 -1.0 0.0          
  0.25 0.0 -1.0 0.0          
  0.12 0.667 -1.0 0.0          
  0.75 -0.33 1.0 0.0          
  0.125 0.0 1.0 0.0          
  0.06 0.667 1.0 0.0          
  1.5 -0.33 -1.0 1000.0          
  0.25 0.0 -1.0 1000.0          
  0.12 0.667 -1.0 1000.0          
  0.75 -0.33 1.0 1000.0          
  0.125 0.0 1.0 1000.0          
  0.06 0.667 1.0 1000.0          

Definitions

Field Contents SI Unit Example
DMGINIID Damage initiation identification number.

No default (Integer > 0)

  
CRI Damage initiation criteria.
MAXE
Damage is initiated when the strain in any direction reaches the corresponding maximum value.
MAXS
Damage is initiated when the stress/traction in any direction reaches the corresponding maximum value.
QUADE
Damage is initiated based on quadratic form of strain.
QUADS
Damage initiated based on quadratic form of stress/traction.
DUCTLE
Ductile damage initiation. 3

No default (Real)

  
LODE Valid only for CRI=DUCTILE.

Flag to activate load parameter dependence for ductile damage initiation.

Default = blank

  
FLAT Valid only for CRI=DUCTILE.

Specifies the handling method for y-values outside the specified range of x-values.

0 (Default)
If an x-value input is outside the range of x-values specified, the corresponding y-value look up is performed using linear extrapolation from the two start or two end points.
FLAT 1
If an x-value input is outside the range of x-values specified, the corresponding y-value is equal to the start or end points, respectively.
  
Y_#, X#_i, X#_j, X#_k The maximum value of strain or stress/traction depending on damage initiation type.

No default (Real > 0.0)

 [ a b s ] MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaamWaaeaaca WGHbGaamOyaiaadohaaiaawUfacaGLDbaaaaa@3AAD@ for MAXE/QUADE/DUCTILE criteria

N m 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca WGobaabaGaamyBamaaCaaaleqabaGaaGOmaaaaaaaaaa@38B4@ for MAXS/QUADS criteria

Comments

  1. The material identification number should be unique for all MAT1, MAT2, MAT3, MAT8, MAT9, MGASK, MCOHE, MCOHED, DMGINI, and DMGEVO entries.
  2. Support information for the damage initiation criteria are:
    Analysis Types Criterion
    Nonlinear Static Analysis, Nonlinear Transient Analysis MAXE, MAXS, QUADE, QUADS, DUCTILE
    Explicit Dynamic Analysis DUCTILE
    Element Types Criterion
    Regular Shell and Solid Elements MAXE, MAXS, QUADE, QUADS, DUCTILE
    Cohesive Elements MAXE, MAXS, QUADE, QUADS
  3. When the DUCTILE damage initiation criterion is used, the parameters are used:
    LODE flag Y_# X#_i X#_j X#_k
    Specified Plastic Strain at failure Stress triaxiality Lode parameter Strain rate
    Blank Plastic Strain at failure Stress triaxiality Strain rate
  4. For additional information about cohesive elements, refer to Cohesive Zone Modeling in the User Guide.