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Mechanics of Composite Structures by George S. Springer, László P. Kollár

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CHAPTER TEN

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Failure Criteria

Failure of fiber-reinforced composites may be caused by fiber buckling, fiber breakage, matrix cracking, delamination, or by a combination of these factors (Fig. 10.1). Local fiber buckling, or microbuckling, reduces the compressive stiffness and strength of the laminate. Microbuckling does not necessarily lead to immediate failure because the surrounding matrix supports the fibers. The properties of the fibers and the matrix greatly affect the onset and magnitude of fiber buckling and the resulting losses in the compressive properties of the laminate.

Figure 10.1: Typical failure modes of composites.

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