Novel Design of Composite Joints

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Adhesively bonded joints have been applied widely inmany industries especially with composite materials. Because of the unavoidable geometric change, discontinuity or material change, the joints or thejoint areas are potentially the weakest regions instructures. Thus the design of the structural jointsis very critical for the whole structure and must bevery carefully designed. In this book, two newdesigns were introduced to improve the performance ofthe double-strap joint. For the first design, thinstep composite laminate attachments were designed andattached onto the conventional double-strap joints.For the second one, multiple layers of straightattachments were used instead of one single layer. Inboth new designs, additional load transfer paths werecreated and localized interfacial stressconcentrations at the leading joint edge of the jointwere reduced. Experiments were performed and theresults revealed that both of the new designs hadsignificantly greater strengths than the conventionaldouble-strap joint. Interfacial stresses along thebondlines were analyzed in order to understand theincrease in joint strength and the change of failuremodes in the joints.