Effect of adhesive material properties on phase-field analysis of T-peel adhesive joints using the Taguchi method

This study investigates the effects of variations in elastic modulus (E), critical energy release rate (G_c), and length scale parameters (l_c) on the failure behaviour of bimetallic T-peel joints using phase-field (PF) analysis. The PF method, recognised for its robustness, is particularly suitable for modelling interface problems and complex crack patterns. Since phase-field results are highly sensitive to material properties, this research aims to systematically evaluate the influence of these parameters using the Taguchi method. To achieve this, the PF model of T-peel joints was validated against experimental tests. The validated models were then employed in a Taguchi L9 design to quantify the effects of material parameters. A comprehensive analysis, including ANOVA and regression, was conducted to further examine these influences. Results indicate that the peak reaction force and the corresponding displacement are most significantly affected by the critical energy release rate, followed by the length scale parameter and elastic modulus. An increase in the critical energy release rate leads to a higher peak force and greater displacement at this force. Conversely, increasing the length scale parameter reduces both peak force and displacement. Interestingly, maintaining a constant ratio of G_c/l_c does not alter the joint behaviour. Additionally, higher Young's modulus enhances joint stiffness, increasing peak force but reducing displacement at this force. This study provides crucial insights into optimising the mechanical performance of bimetallic T-peel joints and underscores the importance of material properties in PF-based analyses.