进行了两种温度三种应力水平下2A12-T4铝合金试样在EXCO溶液中不同浸泡时间的预应力腐蚀试验, 而后进行疲劳试验至试件断裂。采用多元方差分析, 确定了腐蚀温度、浸泡时间和应力水平是影响试件疲劳寿命的显著因素, 三者的共同作用会加剧试样的腐蚀, 降低试样的疲劳寿命。根据试验结果, 采用回归算法, 建立了以腐蚀温度、浸泡时间和应力水平三参数表征的剩余疲劳寿命计算模型, 理论值与试验值对比, 二者误差约为25%。通过扫描电镜观察, 分析了腐蚀温度、浸泡时间和应力水平对试件微观损伤的机理。

Pre-stress corrosion experiments of 2A12-T4 aluminum alloy under two kinds of temperature, three kinds of stress level and different immersion times in EXCO solution were conducted, and then fatigue experiment was implemented to calculate the fatigue life. Multi-variance analysis showed that the corrosion temperature, immersion time and stress level were remarkable factors affecting the fatigue life. Corrosion is being aggravated by the three effects working together, and the fatigue life is reduced. A residual fatigue life calculation model, token with corrosion temperature, immersion time and stress level, was established by regression arithmetic based on the test results. Comparing theoretical values and experimental datas, the errors are about 25%. The fracture surface was observed by SEM, the microscopic damage mechanism of temperature, immersion time and stress level were analyzed.