Numerical simulation of fatigue crack growth rate and crack retardation due to an overload using a cohesive zone model
article
In this work, a numerical method is pursued based on a cohesive zone model (CZM). The
method is aimed at simulating fatigue crack growth as well as crack growth retardation due to an
overload. In this cohesive zone model, the degradation of the material strength is represented by a
variation of the cohesive traction with respect to separation of the cohesive surfaces.
Simulation of crack propagation under cyclic loads is implemented by introducing a damage mechanism
into the cohesive zone. Crack propagation is represented in the process zone (cohesive zone in
front of crack-tip) by deterioration of the cohesive strength due to damage development in the cohesive
element. Damage accumulation during loading is based on the displacements in the cohesive zone.
A finite element model of a compact tension (CT) specimen subjected to a constant amplitude
loading with an overload is developed. The cohesive elements are placed in front of the crack-tip along
a pre-defined crack path. The simulation is performed in the finite element code Abaqus. The cohesive
elements behavior is described using the user element subroutine UEL. The new damage evolution
function used in this work provides a good agreement between simulation results and experimental
method is aimed at simulating fatigue crack growth as well as crack growth retardation due to an
overload. In this cohesive zone model, the degradation of the material strength is represented by a
variation of the cohesive traction with respect to separation of the cohesive surfaces.
Simulation of crack propagation under cyclic loads is implemented by introducing a damage mechanism
into the cohesive zone. Crack propagation is represented in the process zone (cohesive zone in
front of crack-tip) by deterioration of the cohesive strength due to damage development in the cohesive
element. Damage accumulation during loading is based on the displacements in the cohesive zone.
A finite element model of a compact tension (CT) specimen subjected to a constant amplitude
loading with an overload is developed. The cohesive elements are placed in front of the crack-tip along
a pre-defined crack path. The simulation is performed in the finite element code Abaqus. The cohesive
elements behavior is described using the user element subroutine UEL. The new damage evolution
function used in this work provides a good agreement between simulation results and experimental
Topics
TNO Identifier
487291
Source
Advanced Materials Research, 891-892, pp. 777-783.
Pages
777-783
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