Piecewise-linear generalizable cohesive element approach for simulating mixed-mode delamination

A cohesive element formulation is proposed that provides a general framework to approximate experimentally measured Traction–Separation Law (TSL) shapes. Unlike other approaches, it does not assume specific TSL shapes, such as bi-linear or exponential. The shapes are defined generally, in piecewise-linear fashion, and Mode I shear (Mode II III) TSLs can have different Furthermore, added generality by enabling coupling with most fracture criteria the literature. For each material point, scaled based on criterion chosen calculated mode-mixity. If mode-mixity at point changes between damage onset complete fracture, that: (i) energy dissipated determined mixed-mode criterion, (ii) artificial healing/damage prevented. approach shown accurately converge Linear Elastic Fracture Mechanics for conditions approaching quasi-brittle confirming its soundness. brittle–ductile planar reproduces used input, under pure loadings. conditions, specified reproduced ensuring correct dissipated. function of used, chosen, local adaptability approach, evidenced preliminary results, suggests be simulate broad range responses.