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根据热力学原理分别建立了预估单纯疲劳载荷作用下和单纯腐蚀环境下长期载人航天器舱内金属构件的损伤演化方程;并建立了疲劳载荷作用下和预腐蚀疲劳作用下光滑标准件的疲劳寿命预估方法;根据所建立方法和无腐蚀、预腐蚀条件下标准件的疲劳试验结果,建立了损伤演化方程中材质参数的识别方法;最后,建立了长期载人航天器舱内金属构件盐雾腐蚀疲劳寿命预估的损伤力学方法。计算结果与试验结果相比误差在5%以内,二者吻合较好。本文研究可为其他金属构件的预腐蚀和腐蚀疲劳寿命预估提供参考。
According to the principle of thermodynamics, the damage evolution equations of the metal components in the long-term manned spacecraft under simple fatigue loads and purely corrosive environments are respectively established. The fatigue of the smooth standard parts under the fatigue loads and pre-corrosion fatigue are established Life prediction method; According to the established method and non-corrosive, pre-corrosive standard parts of the fatigue test results, the establishment of a damage evolution equation material parameters identification method; Finally, the establishment of long-term manned spacecraft cabin metal salt Damage mechanics method of estimating the fatigue life of fog corrosion. The calculated result is less than 5% compared with the test result, which is in good agreement. This study can provide reference for the pre-corrosion and corrosion fatigue life prediction of other metal components.