Title
Numerical simulation of fatigue crack growth rate and crack retardation due to an overload using a cohesive zone model
Author
Silitonga, S.
Maljaars, J.
Soetens, F.
Snijder, H.H.
Publication year
2014
Abstract
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
Subject
Building Engineering & Civil Engineering
SR - Structural Reliability
TS - Technical Sciences
Buildings and Infrastructure
Architecture Materials
Built Environment
Fatigue crack growth rate
Damage mechanics
Fatigue crack propagation
Cohesive zone model
Crack retardation
To reference this document use:
http://resolver.tudelft.nl/uuid:50ace5a0-cd99-40ac-b887-e8ea88bccc71
TNO identifier
487291
Source
Advanced Materials Research, 891-892, 777-783
Document type
article