复合材料修复铝合金薄板的湿热特性

Hygrothermal Properties of Bonded Composite Repair of Aluminum Alloy Substrates

采用真空袋压技术将T300/CYD128复合材料补片胶接修复于含中心裂纹的铝合金1.76 mm薄板。研究了实验室模拟湿热环境对复合材料修复铝合金薄板的力学性能影响,修复用复合材料的吸湿特性,以及修复用复合材料拉伸试样及其基体树脂浇铸体的湿热性能。结果显示,浇铸体饱和吸水率为0.9%,复合材料吸湿动力学曲线则出现台阶;随湿热老化时间延长,浇铸体与复合材料拉伸性能先升后降,其性能峰值出现时间分别为500 h(73.9 MPa)和300 h(1 531 MPa);随湿热老化时间延长,铝合金裂纹板拉伸性能基本呈线性下降,断裂载荷下降速率ΔN=0.12 kN/100 h,修复板性能出现波动。

Bonded T300/CYD128 composite repair of 1.76mm aluminum substrates was prepared by vacuum bagging technology.The hygrothermal properties of bonded composite repair of aluminum substrates were investigated,so do the composite material＇s pulling sample and it is epoxy casting sample.The Results show that the saturated water absorption of epoxy casting samples is 0.9%,but there is an obvious step in the water absorption dynamics curve.Along with the extending of the hygrothermal effect,the properties of composite material and its epoxy casting sample are increased at first and then decreased.The peak properties appear at 300 h（1 531 MPa） and 500 h（73.9 MPa） respectively.Along with the extending of the hygrothermal effect,the properties of cracking-aluminum substrates fall nearly linearly,the falling rate of fracture load is 0.12 kN/100 h.The properties of bonded-aluminum substrates are unstable.