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

湿热环境下碳纤维环氧树脂复合材料拉伸性能研究

School of Aeronautics, Northwestern Polytechnical University, Xi′an 710072, China

Received: 6 May 2021

Abstract

[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 1 608 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.

摘要

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1 608 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。