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274 Fracture Mechanics: Fundamentals and Applications
FIGURE 6.16 Out-of-plane stress at mid-thickness in a composite laminate, normalized by the remotely
applied strain ( µe represents microstrain). The distance from the free edge, d, is normalized by the ply
thickness t. Taken from Wang, A.S.D., “An Overview of the Delamination Problem in Structural Composites.”
Key Engineering Materials, Vol. 37, 1989, pp. 1–20.
FIGURE 6.17 Compilation of interlaminar fracture toughness data, compared with the toughness of the
corresponding neat resin. Taken from Hunston, D. and Dehl, R., “The Role of Polymer Toughness in Matrix
Dominated Composite Fracture.” Paper EM87-355, Society of Manufacturing Engineers, Deerborn, MI,
1987.
