作　　者： ; ; ; ; ;

机构地区： 北京航空航天大学航空科学与工程学院

出　　处： 《机械强度》 2009年第4期664-669,共6页

摘　　要： 某型飞机疲劳关键件为30CrMnSiNi2A螺钉连接件,为了进行腐蚀条件下疲劳寿命评定,考虑地面停放预腐蚀的影响,采用周期浸润加速腐蚀试验方法,进行不同预腐蚀时间后在随机谱和两种恒幅谱下的成组疲劳试验。结果表明,疲劳寿命随腐蚀时间的增加而降低;在工程常用的时间范围内,若假定疲劳寿命服从对数正态分布,对数疲劳寿命标准差与预腐蚀时间基本无关;若假设疲劳寿命服从威布尔分布,其形状参数与预腐蚀时间基本无关。并以预腐蚀影响系数C(t)反映预腐蚀对疲劳寿命的影响,研究预腐蚀对30CrMnSiNi2A连接件疲劳寿命的影响。 To evaluate the structural life in corrosive environment and to account the pre-corrosion influence parking on the ground, the fatigue life of 30CrMnSiNi2A stimulated component specimen after pre-corrosion was tested under random loading and two constant amplitude fatigue loading. The results show the standards variation of the logarithmic fatigue life is hardly correlated with the pre-corrosion time when assuming the fatigue life follows the logarithmic normal distribution, and the slope is constant when assuming the fatigue life follows the two-parameter Weibull distribution. Then, the pre-corrosion coefficient C（t）, which is the ratio of pre-corroded life to original life, is used to characterize the pre-corrosion influence, and the pre-eorrosion degradation model on fatigue property is proposed for 30CrMnSiNi2A specimen.

关 键 词： 腐蚀 预腐蚀 疲劳寿命 飞机结构 衰减 预腐蚀影响系数

领　　域： [航空宇航科学与技术] [航空宇航科学技术]