Fatigue Performance of Stainless Steel Pin-Reinforced Composite Single-Lap Joints in a Hygrothermal Environment Condition

摘要

Application of the composite material has been extended to various fields and the method of joining composite structures is changing from mechanical joints to the adhesive joints [1,2]. The cocuring of adhesive joining methods results in a relatively high joining strength, and can reduce the manufacturing cost [3]. The z-p inning method among various methods has been actively studied to reinforce to through-thickness strength [4]. Actual structures are commonly exposed to hygrothermal environments during the operation. Existing studies on the z-pinning method, however, have been primarily confined to fatigue properties under room temperature conditions. In this study, we studied the fatigue properties of composite single-lap joints reinforced by stainless steel pins after exposure to various temperature and humidity environments. Three environmental conditions were tested. From the test results, we evaluated the fatigue strength through S-N curves.