Abstract
This chapter presents the modifications in interlaminar fracture toughness with interface control. It examines the underlying physics and the efficiency of these modifying techniques, which have been developed specifically for enhanced interlaminar fracture resistance and damage tolerance of fiber composites. It focuses on the discussion of the advantages achieved and disadvantages induced by the modifications. The property relationships among ductility and toughness of the matrix material, fiber–matrix interface bond strength, composite interlaminar fracture toughness, and impact response are specifically discussed. The chapter discusses that delamination is the most prevalent life-limiting crack growth mode in laminate composites. It focuses on the root causes and the corresponding failure mechanisms of delamination, which are specific to different combinations of fiber and matrix materials and interface characteristics. A number of experimental techniques are developed to characterize the interlaminar fracture toughness of various modes. Many techniques are also devised to combat the problem of delamination. These techniques involve either material improvement or fiber architecture modification.
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