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Abstract

The influence of Kevlar stitches on delaminations, ultimate tensile strength, and tension-tension fatigue life were examined on carbon/bismaleimide laminates of two stacking sequences ([±45/0/90]_2S and [±30/±30/90/90]_S), as representative of two classes of fiber-dominated and matrix dominated laminates. Through-thickness stitching offered a significant improvement in the static delamination resistance of laminated composites, but had varying effects on the ultimate tensile stress of the laminates under study, with an increase in strength of [±30/±30/90/90]_S laminates and a decrease in strength of [±/45/0/90]_2S laminates. But the fatigue life of matrix dominated specimens and fiber dominated specimens were all reduced. The radiographs indicated that stitching appeared efficient in arresting delamination in [±30/±30/90/90]_S specimens for both static and fatigue loads, but did not prove to be as efficient in extending fatigue life, since Kevlar threads were prone to breakage under cyclic loading. As a conclusion, while the static strength and delamination resistance of matrix dominated composites is improved by stitching, the static tensile strength of fiber dominated composites and the tension-tension fatigue performance for all lamination sequences is proved to be reduced.

Keywords

stitching laminates fatigue fatigue life

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Fatigue Behavior of Stitched Carbon/Bismaleimide Composite Laminates

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