An adaptive floating node based formulation for the analysis of multiple delaminations under high cycle fatigue loading
Guillem Gall Trabal (Aalborg University)
Brian Lau Verndal Bak (Aalborg University)
Boyang Chen (TU Delft - Aerospace Structures & Computational Mechanics)
L. Carreras (Aalborg University)
Esben Lindgaard (Aalborg University)
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Abstract
A novel efficient numerical formulation for the analysis of multiple fatigue-driven delamination cracks is presented. A cohesive zone model is used in combination with an Adaptive Refinement Scheme (ARS) and an Adaptive Floating Node Method (A-FNM) element that refine the model effectively during the analysis. Novel techniques are proposed to track the positions of multiple crack tips and calculate the mode decomposed energy release rates for the individual crack tips using the J-integral. The method has been implemented in a Matlab finite element code and validated with single and multiple delamination cases with varying mode mixities. Comparisons with theoretically based predictions and available experimental data showcase the high accuracy of the method. The presented method lowers the computational time compared to standard, fully refined finite element models by a factor of 4–5.
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