CAJ | 학술논문

由于局部应力应变法存在缺陷而引入场强法,对缺口构件的疲劳寿命预测问题进行研究。给出了应力场强法估算缺口构件疲劳寿命的基本框架和分析计算步骤,通过算例对场强法重要参数场径的影响因素、应力集中系数和权函数进行了探讨,并对场强计算中的有限元网格细化问题进行了初步探讨。采用场强法和局部应力应变法对某型发动机燃烧室机匣后衬套安装座进行了疲劳寿命预测。结果表明：利用场强法预测出的寿命更接近试验结果。
유우국부응력응변법존재결함이인입장강법,대결구구건적피로수명예측문제진행연구。급출료응력장강법고산결구구건피로수명적기본광가화분석계산보취,통과산례대장강법중요삼수장경적영향인소、응력집중계수화권함수진행료탐토,병대장강계산중적유한원망격세화문제진행료초보탐토。채용장강법화국부응력응변법대모형발동궤연소실궤갑후츤투안장좌진행료피로수명예측。결과표명：이용장강법예측출적수명경접근시험결과。
The procedure of fatigue life assessment of notch component on ＂stress field intensity＂（SFI） approach was studied due to the defect of local stress strain method.The basic framework and the calculaiton procedure of the fatigue life assessment of notch component by stress field intensity approach were presented.The factors on field radius,stress concentration factor,weigh function for the calculation of field intensity were studied by examples.The prilimanery investigation on FE grid finning were completed for the calculation of field intensity.The assessment value of fatigue life of the combustor casing rear bush installation seat were conducted by SFI method and local stress-strain method.The results show that the assessment value of the fatigue life using SFI method is closer to the test result.