Rate and temperature dependent viscoelastic cohesive zone model for mode-idelamination of composites

Ammasai Sengodan, Ganapathi

Abstract

Introduction Initiation and propagation of delamination at room temperature and constant loading rates are modelled accurately by using bi-linear or exponential cohesive zone models (CZM) [1]. These "standard" traction-separation based models do not adequately represent the effects of loading rate and/or varying environmental condition on fracture. Usually, empirical expressions are used to include the strain rate effects into the traction and fracture energy calculations [2]. These empirical models capture the rate effects reasonably but lack physical underpinning and generality. In this work, we present a cohesive zone modelling framework that accounts the effect of loading rate and temperature on the delamination behaviour. Here it is applied to the case of a double cantilever beam (DCB) test. For a given loading rate, the proposed model is able to match the delamination prediction from bilinear models, with static parameters. The new model capability can however additionally extend to different loading rates and temperature conditions, without additional or calibrated parameters. The energy dissipation due to the viscoelasticity and the eventual presence of toughening thermoplastic particles in the interface are both taken into account in the current modelling framework.

• Presentation Conference Type: Conference Paper (published)
• Conference Name: ICCM 23 International Conference on Composite Materials
• Start Date: Jul 30, 2023
• End Date: Aug 4, 2023
• Acceptance Date: Aug 13, 2023
• Online Publication Date: Aug 13, 2023
• Publication Date: Aug 13, 2023
• Deposit Date: Sep 8, 2023