/MAT/LAW117
Block Format Keyword This law represents the constitutive relation of ductile adhesive materials in 2 modes for normal and tangential directions. This law models the elastic and failure response of the material.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/MAT/LAW117/mat_ID/unit_ID | |||||||||
mat_title | |||||||||
EN | ET | Imass | Idel | Irupt | |||||
Fct_TN | Fct_TT | TN | TT | Fscale_x | |||||
GIC | GIIC | EXP_G | EXP_BK | Gamma |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier. (Integer, maximum 10 digits) |
|
unit_ID | (Optional) Unit Identifier. (Integer, maximum 10 digits) |
|
mat_title | Material title. (Character, maximum 100 characters) |
|
Initial density. (Real) |
||
EN | Stiffness normal to the plane of the cohesive
element. (Real) |
|
ET | Stiffness in the plane of the cohesive
element. (Real) |
|
Imass | Mass calculation flag.
(Integer) |
|
Idel | Failure flag indicating the number of
integration points to delete the element (between 1 and
4). Default = 1 (Integer) |
|
Irupt | Mixed mode displacement law flag.
(Real) |
|
Fct_TN | Function identifier of the peak traction in
normal direction versus element mesh
size. (Integer) |
|
Fct_TT | Function identifier of the peak traction in
tangential direction versus element mesh
size. (Integer) |
|
TN | Peak traction in normal direction (default =
0) or, Fct_TN ordinate scale factor (default = 1) (Real) |
|
TT | Peak traction in tangential direction (default =
0) or, Fct_TT ordinate scale factor (default = 1) (Real) |
|
Fscale_x | Fct_TN and
Fct_TT abscissa scale factor. Default = 1 (Real) |
|
GIC | Energy release rate for mode I. (Real) |
|
GIIC | Energy release rate for mode II. (Real) |
|
EXP_B | Power law exponent for the mixed mode. Default = 2 (Real) |
|
EXP_BK | Benzeggage-Kenane exponent for the mixed
mode. (Real) |
|
Gamma | Gamma exponent for Benzeggage-Kenane
law. Default = 1 (Real) |
Example (Connect Material)
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
Units
kg mm ms
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/LAW117/1/1
CONNECT MATERIAL
# RHO_I
7.8E-6
# EN ET Imass Idel Irupt
5 1.2 0 1 0
# Fct_TN Fct_TT TN TT Fscale_x
0 0 2 0.7 0
# GIC GIIC EXP_B EXP_BK Gamma
1 1.75 2 2 1
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#ENDDATA
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
- Mode I refers to the normal direction and mode II refers to the shear direction. is the separation in normal direction equal to direction. is equal to the separation in tangential direction . The mixed mode displacement is referred to by .
- The damage initiation
displacement in mode I and mode II are respectively,
and
and for the mixed mode:
(1) With the mode mix .
- The maximum displacement at
failure
can be calculated using either a Power law
for
Irupt=1:
(2) or, a Benzeggage-Kenane law for Irupt =2:(3) - GIC and
GIIC are the energy release rates between the peak
traction and the maximum displacement for mode I and mode II, respectively.
and