湿热环境下碳纤维环氧树脂复合材料拉伸性能研究

Effect of hygrothermal environment on tensile properties of carbon fiber epoxy resin composites

为了研究不同铺层对TG800/E207碳纤维环氧树脂复合材料吸湿特性和拉伸性能的影响,制备了[0]_(16),[90]_(16),[±45]_(4s)和[+45/0/0/-45/-45/0/0/+45]_(s) 4种铺层的复合材料层板,分析了复合材料在80℃,90%RH环境中的吸湿动力学曲线、吸湿损伤形貌、破坏形貌、载荷位移曲线及其强度退化。结果表明:TG800/E207复合材料层板的吸湿曲线呈现多阶段现象。当吸湿时间达到1608 h时,吸湿趋于平衡;[90]_(16)的吸湿量最低,其最终吸湿量仅为0.806%;[+45/0/0/-45/-45/0/0/+45]_(s)的吸湿量最高,其最终吸湿量为0.876%。与室温干态(RTD)条件下相比,室温湿态(RTW)条件下这4种铺层复合材料层板破坏载荷分别降低了13.80%,27.36%,10.70%和25.60%。[90]_(16)的最终吸湿量最低但其拉伸强度退化最为严重。

[0]_(16),[90]_(16),[±45]_(4s) and[+45/0/0/-45/-45/0/0/+45]_(s) were fabricated to study the influence of the different ply lay-up on the moisture absorption and tensile properties of TG800/E207 carbon fiber epoxy resin composite laminates at a hygrothermal environment of 80℃and 90%RH.Moisture absorption curves,damage morphology after moisture absorption,fracture morphology,load-displacement curves and strength degradation were analyzed.The results show that the moisture absorption curves of TG800/E207 composite laminates present multi-stage phenomenon.The moisture adsorption reached equilibrium at a moisture absorption time of 1608 hours.The equilibrium moisture content of [90]_(16) is the lowest and its saturated moisture content is only 0.806%;the equilibrium moisture content of[+45/0/0/-45/-45/0/0/+45]_(s) is the highest and its saturated moisture absorption rate is 0.876%.The failure load of[0]_(16),[90]_(16),[±45]_(4s) and[+45/0/0/-45/-45/0/0/+45]_(s) samples decreased by 13.8%,27.36%,10.7%and 25.6%,respectively.The saturated moisture absorption of [90]_(16) is the lowest,but its tensile strength degradation is the most serious.