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Journal of Composite Materials
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Fracture Mechanics for Delamination Problems in Composite Materials

S.S. Wang

Department of Theoretical and Applied Mechanics University of Illinois Urbana, Illinois 61801

A fracture mechanics approach to the well-known delamination problem in com posite materials is presented. Based on the theory of anisotropic laminate elasticity and interlaminar fracture mechanics concepts, the composite delamination problem is for mulated and solved. The exact order of the delamination crack-tip stress singularity is determined. Asymptotic stress and displacement fields for an interlaminar crack are obtained. Fracture mechanics parameters such as mixed-mode stress intensity factors, KI, KII, KIII, and the energy release rate, G, for composite delamination problems are defined. To illustrate the fundamental nature of the delamination crack behavior, solu tions for edge-delaminated graphite-epoxy composites under uniform axial extension are presented. Effects of fiber orientation, ply thickness, and delamination length on the interlaminar fracture are examined.

Journal of Composite Materials, Vol. 17, No. 3, 210-223 (1983)
DOI: 10.1177/002199838301700302
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