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

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

Trabal, Guillem Gall (Aalborg University)
Bak, Brian Lau Verndal (Aalborg University)
Chen, B. Y. (TU Delft Aerospace Structures & Computational Mechanics)
Jensen, Simon Mosbjerg (Aalborg University)
Lindgaard, Esben (Aalborg University)

Vassilopoulos, Anastasios P. (editor)
Michaud, Véronique (editor)

2022

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.

Delamination toughening
multiple delamination
adaptive refinement
cohesive zone modelling
Floating Node Method

http://resolver.tudelft.nl/uuid:829a44d6-e231-4277-b362-fae7eba6a9f2

EPFL Lausanne, Composite Construction Laboratory, Lausanne

978-2-9701614-0-0

Proceedings of the 20th European Conference on Composite Materials: Composites Meet Sustainability: Vol 4 – Modeling and Prediction

20th European Conference on Composite Materials, 2022-06-26 → 2022-06-30, Lausanne, Switzerland

Institutional Repository

conference paper

© 2022 Guillem Gall Trabal, Brian Lau Verndal Bak, B. Y. Chen, Simon Mosbjerg Jensen, Esben Lindgaard