A crack tip tracking algorithm for cohesive interface element analysis of fatigue delamination propagation in composite materials
By L. Kawashita, S. Hallett. 2012
158 citations recorded by the source corpus.
A novel approach is proposed for the use of cohesive elements in the analysis of delamination propagation in composite materials under high-cycle fatigue loading. The method is applicable to delamination propagation within the Paris-law regime and is suitable for the analysis of three-dimensional structures typical of aerospace applications. The major advantages of the proposed formulation are its complete independence of the cohesive zone length – which is a geometry-dependent parameter – and its relative insensitivity to mesh refinement. This is only possible via the introduction of three nonlocal algorithms, which provide (i) automated three-dimensional tracking of delamination fronts, (ii) an estimation of direction of crack propagation and (iii) accurate and mesh-insensitive integration of strain energy release rate. All calculations are updated at every increment of an explicit time-integration finite element solution, which models the envelopes of forces and displacements with an assumption of underlying constant cyclic loading. The method was implemented as a user-defined subroutine in the commercial finite element software LS-Dyna and supports the analysis of complex three-dimensional models. Results are presented for benchmark cases such as specimens with central cut plies and centrally-loaded circular plates. Accurate predictions of delamination growth rates are observed for different mesh topologies in agreement with the Paris-laws of the material.
Subfields: Civil and Structural Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/1d8fbcf7bb07387921c3207abb32e2ae4a722e38
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In Civil and Structural Engineering
Citations in the corpus
- A review on failure theories and simulation models for adhesive joints (2021, background): “The general idea which underpins the simulation of fatigue debonding growth is the modification of the bilinear traction-separation law by degrading the strength, as well as the stiffness and fracture energy of the cohesive elements as a function of the applied load cycles .([161,162]) For this purp”