Cohesive zone models are commonly used to numerically model fracture phenomena on the microscale. Typical processes described experimentally via Double Cantilever Beam (DCB) test and End Notched Flexure (ENF) macroscale. Analytical solutions, e.g. LEFM-based beam theory, evaluate these tests validate numerical models. However, some input parameters of cohesive models, i.e. stiffness strength, i...

When a particle inclusion is embedded in a polymer matrix, the polymer tends to adsorb on the surface of the in-clusion. The effect of this may result in an interphasial zone between the particle and the polymer often referred toas “bound” rubber. The extent and composition of this zone depends on a number of factors, including the surfacearea and surface treatment of the partic...

In this work, we apply the multiscale cohesive method (Zeng and Li [2010]) to simulate fracture and crack propagations in polycrystalline solids. The multiscale cohesive method uses fundamental principles of colloidal physics and micro-mechanics homogenization techniques to link the atomistic binding potential with the mesoscale material properties of the cohesive zone, and hence the method can...

In recent years, cohesive zone models (CZMs) have been developed and widely used in numerical simulations to account for crack initiation and propagation in different materials and structures. This study is focused on the modeling of the elastoplastic damageable behaviour of ductile materials. The damage is associated with a cohesive behaviour of the interface between the purely elastoplastic s...

Ultrasonic spot welds have been used as a model system to investigate how to determine the mode-I cohesive parameters associated with interfacial fracture of a spot weld. Numerical analyses indicated that, while multiple combinations of the two cohesive parameters (characteristic strength, σ̂ , and toughness, I ) could result in virtually indistinguishable behaviors for individual geometries, on...

The present paper is concerned with modelling damage and fracture in notched woven fabric composites. Previous experimental work has shown that damage at a notch in a variety of GFRP and CFRP composites based on woven fabric reinforcement comprises matrix damage and fibre tow fracture along the plane of maximum stress. It is these experimental observations that inform the failure modelling deve...

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We investigated the shear strain field ahead of a supershear rupture. The strain array data along the sliding fault surfaces were obtained during the large-scale biaxial friction experiments at the National Research Institute for Earth Science and Disaster Resilience. These friction experiments were done using a pair of meter-scale metagabbro rock specimens whose simulated fault area was 1.5 m ...

The peel test is a popular test method for measuring the peeling energy between flexible laminates. However, when plastic deformation occurs in the peel arm(s) the determination of the true adhesive fracture energy, Gc, from the measured peel load is far from straightforward. Two different methods of approaching this problem have been reported in recently published papers, namely: (a) a simple ...

Due to the miniaturization of integrated circuits, their thermo-mechanical reliability tends to become a truly critical design criterion. Especially the introduction of copper and low-k dielectric materials cause some reliability problems. Numerical simulation tools can assist developers to meet this challenge. This paper considers the first bond integrity during wire bond qualification testing...