飞机结构预腐蚀疲劳曲线研究

为评估地面停放预腐蚀对飞机结构疲劳寿命的影响 ,采用二元线性回归方法建立了一种新的预腐蚀疲劳曲线幂函数表达式。该曲线的指数为常量而对数截距是预腐蚀时间的线性函数。这两个特性使得曲线形式简单 ,参数几何、工程含义明确 ,并易于工程应用。通过寿命反推建立了参数修正的三参数预腐蚀疲劳曲线 ,该曲线已成功用于飞机结构腐蚀条件下的疲劳寿命估算。

Research on Fatigue Curves for Pre-corroded Aircraft Structures

To quantitatively evaluate the effects of corrosion during grounding on fatigue life of aircraft structures, a new power equation is proposed using two-variable linear regression method. That the slope is a constant and the logarithmic intercept is a linear function of pre-corrosion time makes this equation advantageous: it has a simple form, its parameters have unambiguous technical and geometrical meanings, and it facilitates engineering applications. Three-parameter equations after pre-corrosion are obtained from back-calculation of fatigue limits, which have been successfully used to predict safe life of aircraft structures in corrosive environment.