论文部分内容阅读
针对铸铝合金A356-T6开展了不同环境湿度下的超声疲劳裂纹扩展试验和实验室环境湿度下的常规疲劳裂纹扩展试验。由试验结果可知,超声疲劳在干空气环境中的疲劳裂纹扩展速率最低,而在蒸馏水环境中的疲劳裂纹扩展速率最高。常规疲劳在实验室环境中的疲劳裂纹扩展速率和超声疲劳在蒸馏水环境中的疲劳裂纹扩展速率几乎一致。针对Wei建立的环境湿度对铝合金材料疲劳裂纹扩展速率预测模型进行了修正,得到了铸铝合金A356-T6在任意环境湿度和试验频率下的疲劳裂纹扩展速率预测模型。
For the aluminum alloy A356-T6, ultrasonic fatigue crack growth test under different environmental humidity and conventional fatigue crack growth test under laboratory environment humidity were carried out. From the test results, it can be seen that the fatigue crack propagation rate of ultrasonic fatigue is the lowest in dry air environment, while the fatigue crack growth rate is the highest in distilled water environment. Fatigue crack growth rates of conventional fatigue in laboratory environments are almost identical to those of ultrasonic fatigue in distilled water environments. Aiming at the environment humidity established by Wei, the fatigue crack growth rate prediction model of aluminum alloy was modified and the prediction model of fatigue crack growth rate of aluminum alloy A356-T6 under any ambient humidity and test frequency was obtained.