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Fracture of adhesive joints and laminated composites
Author(s) -
Lee Shaw Ming
Publication year - 1987
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760270111
Subject(s) - materials science , composite material , adhesive , fracture toughness , delamination (geology) , fracture mechanics , composite number , fracture (geology) , residual stress , cracking , modulus , layer (electronics) , paleontology , biology , subduction , tectonics
The 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 σ y , resin G IC 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.