DMGINI

Bulk Data Entry Defines the damage initiation criteria.

Format I (CRI=MAXE, MAXS, QUADE, or QUADS)

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI DMGINIID CRI FLAT
V1_1 V2_1 V3_1 X1
V1_2 V2_2 V3_2 X2
V1_3 V2_3 V3_3 X3
etc. etc. etc. etc.

Format II (CRI=DUCTILE)

(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 (Format I)

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

Example 2 (Format I)

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

Example 3 (Format I, with temperature dependency)

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DMGINI 22 QUADE FLAT
2.0E-3 2.4E-3 2.4E-3 20.0
2.5E-3 3.0E-3 3.0E-3 100.0

Example 4 (Format II)

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

Example 5 (Format II)

(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 6 (Format II, 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. Valid for Format II only.

Flag to activate load parameter dependence for ductile damage initiation.

Default = blank
FLAT

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.
V1, V2, V3

The maximum value of strain or traction depending on cohesive damage initiation type corresponding to Mode I, II and III.

If V3 is blank, V3 = V2.

No default (Real > 0)

[abs] for ‘MAXE’/’QUADE’ criteria in cohesive elements

Unit of Length for ‘MAXE’/’QUADE’ criteria in cohesive contacts

Force/Length2 for ‘MAXS’/’QUADS’ criteria in cohesive elements

Force/Length3 for ‘MAXS’/’QUADS’ criteria in cohesive contacts
V1_i, V2_i, V3_i

The maximum values of strain or traction depending on cohesive damage initiation type corresponding to temperature Xi. Format I only.

V3_i cannot be blank, even if it is equal to V2_i.

No default (Real > 0)
Xi

Temperature values to define temperature dependency. Format I only

X1 can be blank, if damage initiation constants are temperature independent.

No default (Real)
Y_#, X#_i, X#_j, X#_k The maximum value of strain or stress/traction depending on damage initiation type. For Format I only.

No default (Real > 0.0)

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

N m 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca WGobaabaGaamyBamaaCaaaleqabaGaaGOmaaaaaaaaaa@38B4@ for DUCTILE 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 DUCTILE
    Cohesive Elements/Contacts 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.