Cohesive element load verification

This problem contains basic test cases for one or more Abaqus elements and features.

This page discusses:

Elements tested
Features tested
Problem description
Results and discussion
Input files

ProductsAbaqus/StandardAbaqus/Explicit

Elements tested

COH2D4

COH2D4P

COH2D4T

COH3D6

COH3D6P

COH3D6T

COH3D8

COH3D8P

COH3D8T

COHAX4

COHAX4P

COHAX4T

Features tested

The following features are tested in this verification problem:

Element-based distributed loading.
Surface-based distributed loading.
Thermal loading specified using predefined temperatures.

Problem description

In this verification test all the nodes of each element are fixed, and the reaction forces generated at the nodes as a result of the load application are used to verify the element load calculations. In addition, the effect of thermal loading is verified by allowing each element to deform freely in the thickness direction with the change in temperature. The resulting thermal strains in the thickness direction are compared with the analytical results.

Model:

COH3D6, COH3D6P, COH3D6T, COH3D8, COH3D8P, and COH3D8T:


Cubic dimensions	7 × 7 × 7
Thickness	Geometry
Thickness direction	Global 2
Response	Continuum
Centrifugal axis of rotation	(1, 0, 0) through (3.5, −1000, 3.5)
Coriolis axis of rotation	(1, 0, 0) through origin
Gravitational load vector	(0, 1, 0)

COH2D4, COH2D4P, and COH2D4T:


Planar dimensions	7 × 7
Thickness	Geometry
Thickness direction	Global 2
Response	Continuum
Centrifugal axis of rotation	(1, 0, 0) through (3.5, −1000, 0.0)
Coriolis axis of rotation	(0, 0, 1) through origin
Gravitational load vector	(0, 1, 0)

COHAX4, COHAX4P, and COHAX4T:


Planar dimensions	10 × 10
Thickness	Geometry
Thickness direction	Global 1; Global 2
Response	Continuum
Centrifugal axis of rotation	(0, 1, 0) through origin
Gravitational load vector	(0, 1, 0)

Material:


Young's modulus	3 × 10⁶
Poisson's ratio	0.3
Coefficient of thermal expansion	0.0001
Density	10.0

Initial conditions


Initial temperature	ALL, 0.0

Results and discussion

The calculated reactions are in agreement with the applied loads. In addition, the thermal stresses and strains in the thickness direction match the analytical results for the case of thermal loading.

Input files

Abaqus/Standard input files

coh3d8_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, TEMPERATURE for COH3D8.
coh3d6_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, TEMPERATURE for COH3D6.
coh2d4_loads_std.inp: BX, BY, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P, TEMPERATURE for COH2D4.
cohax4_loads_std.inp: BR, BZ, GRAV, CENT, CENTRIF, P1, P2, P3, P4, P, TEMPERATURE for COHAX4.
coh3d8p_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, TEMPERATURE for COH3D8P.
coh3d6p_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, TEMPERATURE for COH3D6P.
coh2d4p_loads_std.inp: BX, BY, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P, TEMPERATURE for COH2D4P.
cohax4p_loads_std.inp: BR, BZ, GRAV, CENT, CENTRIF, P1, P2, P3, P4, P, TEMPERATURE for COHAX4P.
coh3d8t_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, temperature boundary condition for COH3D8T.
coh3d6t_loads_std.inp: BX, BY, BZ, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P5, P6, P, temperature boundary condition for COH3D6T.
coh2d4t_loads_std.inp: BX, BY, GRAV, CENT, CENTRIF, ROTA, P1, P2, P3, P4, P, temperature boundary condition for COH2D4T.
cohax4t_loads_std.inp: BR, BZ, GRAV, CENT, CENTRIF, P1, P2, P3, P4, P, temperature boundary condition for COHAX4T.
coh_corioload.inp: CORIO for COH3D8, COH3D6, and COH2D4.
cohp_corioload.inp: CORIO for COH3D8P, COH3D6P, and COH2D4P.
coht_corioload.inp: CORIO for COH3D8T, COH3D6T, and COH2D4T.
coh3d8t_thermal_loads.inp: BF, S1, S2, F1, F2, R1, R2 for COH3D8T.
coh3d6t_thermal_loads.inp: BF, S1, S3, F1, F3, R1, R3 for COH3D6T.
coh2d4t_thermal_loads.inp: BF, S1, S2, F1, F2, R1, R2 for COH2D4T.
cohax4t_thermal_loads.inp: BF, S1, S3, F1, F3, R1, R3 for COHAX4T.
coh2d4t_cthermal_loads.inp: CFILM, CRADIATE for COH2D4T.

Abaqus/Explicit input files

coh_bf_grav_xpl.inp: BX, BR, BY, BZ, GRAV for COH3D8, COH3D6, COH2D4, and COHAX4.
coh_p_vp_xpl.inp: P1, P2, P3, P, VP1, VP2, VP3, VP4, VP for COH3D8, COH3D6, COH2D4, and COHAX4.
coh_thermal_xpl.inp: TEMPERATURE for COH3D8, COH3D6, COH2D4, and COHAX4.