Numerical study of adhesive joints under high strain rate loading 2

• Main Author: Χατζάκη, Ζωή
• Other Authors: Chatzaki, Zoi
• Language: English
• Published: 2022
• Subjects: SERR; Adhesive joints; Συγκολλητοί σύνδεσμοι

In this thesis, the numerical study of the response of an adhesive joint, under static and high-rate loading is presented. The joint consists of two dissimilar adherents, a Titanium and a CFRP (Carbon Fibre Reinforced Plastic). The developed numerical models are calibrated using the experimental eigenfrequencies and a hybrid analytical experimental method. To begin with, a modal analysis is presented to find the eigenfrequencies and eigenmodes of the joint specimen. Then, the finite element models created are presented in order to model crack propagation using the VCCT (Virtual Crack Closure Technique) method under static and dynamic loads. By using experimental data, the calibration of the models is achieved and the critical SERR (Strain energy Release Rate) is found for each loading case. The second part of the thesis presents a chapter dealing with the fractography analysis of the fracture surfaces of the specimens from the static and dynamic experiments. The fracture mechanisms that prevailed in each of the specimens are compared using optical and electron microscopy.