Tomas Walander

Temperature dependence of cohesive laws for an epoxy adhesive in Mode I and Mode II loading

The influence of the temperature on the cohesive laws for an epoxy adhesive is studied in the glassy region, i.e. below the glass transition temperature. Cohesive laws are derived in both Mode I and Mode II under quasi-static loading conditions in the temperature range

Influence of Edge-Boundaries on the Cohesive Behaviour of an Adhesive Layer

-30le T le 80^{,circ }

Fatigue damage of adhesive layers : experiments and models

-30≤T≤80∘C. Three parameters of the cohesive laws are studied in detail: the elastic stiffness, the peak stress and the fracture energy. Methods for determining the elastic stiffness in Mode I and Mode II are derived and evaluated. Simplified bi-linear cohesive laws to be used at any temperature within the studied temperature range are derived for each loading mode. All parameters of the cohesive laws are measured experimentally using only two types of specimens. The adhesive has a nominal layer thickness of 0.3xa0mm and the crack tip opening displacement is measured over the adhesive thickness. The derived cohesive laws thus represent the entire adhesive layer as having the present layer thickness. It is shown that all parameters, except the Mode I fracture energy, decrease with an increasing temperature in both loading modes. The Mode I fracture energy is shown to be independent of the temperature within the evaluated temperature span. At

Prediction of mixed-mode cohesive fatigue strength of adhesively bonded structure using Mode I data

80^{,circ }

An evaluation of the temperature dependence of cohesive properties for two structural epoxy adhesives

80∘C the Mode II fracture energy is decreased to about 2/3 of the fracture energy at