CAJ | 학술논문

在采用应力－强度干涉理论进行可靠性分析时，需要根据材料的现有疲劳实验数据，获得任意指定寿命下的疲劳强度概率分布。文中提出了一种疲劳寿命服从对数正态分布的疲劳强度概率分布数值模拟方法。该方法在有限寿命阶段内，根据两条已知的疲劳特性（P-S-N）曲线，重构任意存活率下的 P-S-N曲线，进而运用蒙特卡罗技术推断任意指定寿命下的疲劳强度概率分布。以20Cr2Ni4A 为例进行相关分析，结果表明，P-S-N 曲线重构精度高，疲劳强度概率分布接受正态分布假设，模拟结果符合等同性原理和疲劳强度衰减理论。这说明文中方法是有效的。
재채용응력－강도간섭이론진행가고성분석시，수요근거재료적현유피로실험수거，획득임의지정수명하적피로강도개솔분포。문중제출료일충피로수명복종대수정태분포적피로강도개솔분포수치모의방법。해방법재유한수명계단내，근거량조이지적피로특성（P-S-N）곡선，중구임의존활솔하적 P-S-N곡선，진이운용몽특잡라기술추단임의지정수명하적피로강도개솔분포。이20Cr2Ni4A 위례진행상관분석，결과표명，P-S-N 곡선중구정도고，피로강도개솔분포접수정태분포가설，모의결과부합등동성원리화피로강도쇠감이론。저설명문중방법시유효적。
When a reliability analysis is performed according to the stress-strength interference theory,the fatigue strength probability distribution needs to be obtained at an arbitrary fatigue life based on the existing fatigue experi-ment data of material.In this paper,a simulation method of fatigue strength probability distribution is proposed under the condition that the fatigue life follows a lognormal distribution.In this method,a P-S-N curve at an arbi-trary survival probability with a finite life is reconstructed according to two known P-S-N curves,and then the fatigue strength probability distribution at an arbitrary fatigue life is inferred by means of the Monte Carlo simulation method.Finally,analyses on 20Cr2Ni4A are performed.It is found that the reconstructed P-S-N curve is highly precise,the fatigue strength probability distribution follows normal distribution and the simulation results accord well with the equality principle and the fatigue strength degradation theory.The above results show that the pro-posed method is effective.