| Summary: | 碩士 === 逢甲大學 === 紡織工程所 === 94 === In this thesis, composite springs were made of different fiber prepreg .ie carbon fibers, E-glass fibers and Kevlar 49 fibers, with relevant mechanical sprig constant (K) and fatigue tested after parts cured.
According to the experimental results, the structure of composite springs mixed with carbon fibers and glass fibers have the higher load per unit compression displacement which is better than other composition. After comparing with other structures, the C50G50 structure of spiral spring has good properties with more cost effective. Its load per unit compression displacement reaches 469.3 lb/in and the displacement is 1.590 in. Fatigue resistance was tested by fixing compression displacement, which was set as 70 percent of maximum compression displacement of the composite spring with 300,00times a cycle. Based on the fatigue test, the decreases of load during fatigue test are both in the range of 5 percent for the springs made of carbon fibers and glass fibers (C50G50, C30G70) and the sprigs made of high modulus carbon fibers and glass fibers (HC50G50, HC30G70).
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