Cohesive-Zone Modeling of Adhesive Joints
Two distinct failure criteria have traditionally been used to model adhesive joints: a strength-based criterion using the cohesive strength of the adhesive, and an energy-based criterion using the toughness of the adhesive. In practice there are conditions under which the properties of a joint may be controlled by either one of these criteria, or by both. Cohesive-zone models have an advantage in that they incorporate both criteria simultaneously, automatically allowing whichever one is dominant to control fracture in a numerical analysis. Cohesive-zone models are particularly useful for problems involving adhesive joints in which the crack path is generally known; there is a natural convenience in being able to assign the entire deformation of the adhesive layer to the cohesive process, and to distinguish this deformation from that of the adherends. It is recognized that such an approach means that the cohesive law may be affected by details of the geometry, such as adhesive thickness , but similar limitations are accepted when using linear-elastic fracture mechanics to describe fracture.
KeywordsCrack Opening Displacement Adhesive Layer Cohesive Zone Adhesive Joint Cohesive Strength
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