Numerical study of the delamination toughening effect of weakening and toughening patche
Guillem Gall Trabal (Aalborg University)
Brian Lau Verndal Bak (Aalborg University)
B. Chen (TU Delft - Aerospace Structures & Computational Mechanics)
Simon Mosbjerg Jensen (Aalborg University)
Esben Lindgaard (Aalborg University)
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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.
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