Numerical study of the delamination toughening effect of weakening and toughening patche

Conference paper (2022)

Authors

Guillem Gall Trabal Aalborg University
Brian Lau Verndal Bak Aalborg University
B. Y. Chen Aerospace Structures & Computational Mechanics - Aerospace Engineering
Simon Mosbjerg Jensen Aalborg University
Esben Lindgaard Aalborg University
Research Group
Aerospace Manufacturing Technologies (Aerospace Engineering) (TU Delft)
Copyright: © 2022 Guillem Gall Trabal, Brian Lau Verndal Bak, B. Y. Chen, Simon Mosbjerg Jensen, Esben Lindgaard
Cohesive zone modelling Adaptive refinement Delamination toughening Multiple delamination Floating Node Method
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Published Date

2022

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Aerospace Manufacturing Technologies

Abstract

A numerical study on the feasibility of using patches of interface weakening or toughening material to trigger multiple delaminations toughening laminated composite structures against delamination is presented. The studies use an adaptive refinement formulation that uses cohesive elements to model delamination initiation and propagation. A DCB specimen is loaded under displacement control with two cohesive interfaces and a single pre-crack is introduced in one of them. The studies show that multiple delaminations can be initiated in the secondary originally uncracked interface by placing interface toughening patches at the main pre-cracked interface or interface weakening patches at the secondary one. The energy dissipation significantly increases compared to a standard DCB specimen featuring a single delamination.