Abstract
AbstractThe mechanisms of resin controlled failure in adhesive joints and composites (delamination and transverse cracking) are examined. An in‐situ failure model based on the fracture mechanics principles is applied here to describe the failure processes involved. The model centers on the crack tip plastic zone developed in the thin resin layer between the fibers or the adherends. The plastic zone in the resin layer is heavily influenced by a dominant slow varying stress distribution, approximated to be r−m/2 dependent with m ≪ 1 (r is the distance from the crack tip). The adhesive or composite fracture toughness G*IC can then be expressed as a function of several resin properties of comparable importance: modulus E, yield stress σy, resin GIC and residual stress. The relative significance of the resin properties on the adhesive or composite fracture is discussed. The effects of temperature, loading rate, and resin toughening on such failure as a result of the corresponding variations in resin properties are also addressed.
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