CAJ | 학술논문

针对传统疲劳寿命预估算法精度低且适用性窄的问题，结合工程结构件的实际特点确定了对疲劳寿命估算精度造成影响的主要因素，将影响因素量化为具体的修正因子，并在此基础上提出了一种基于多因素修正的结构件疲劳寿命预估方法。然后应用修正后的算法对实例构件的疲劳寿命进行估算，并将估算结果与应用局部应力应变法估算的结果及台架疲劳试验结果进行对比。结果表明，修正后的算法能够实现一般大型结构件疲劳寿命的准确估算，是一类预测精度高、实施方便且具有广泛工程应用前景的疲劳寿命估算方法。
침대전통피로수명예고산법정도저차괄용성착적문제，결합공정결구건적실제특점학정료대피로수명고산정도조성영향적주요인소，장영향인소양화위구체적수정인자，병재차기출상제출료일충기우다인소수정적결구건피로수명예고방법。연후응용수정후적산법대실례구건적피로수명진행고산，병장고산결과여응용국부응력응변법고산적결과급태가피로시험결과진행대비。결과표명，수정후적산법능구실현일반대형결구건피로수명적준학고산，시일류예측정도고、실시방편차구유엄범공정응용전경적피로수명고산방법。
To solve the low accuracy and narrow application of traditional estimation approaches, the main factor affecting the estimation accuracy of fatigue life are determined according to practical characteristics of engineering structures.These factors are quantified as the concrete correction coef-ficients.Then, estimation approach of structure fatigue life based on multiple factors correction is proposed.The fatigue life of an instance is estimated by this corrected estimation approach.The esti-mation results are compared with those of the local stress-strain method and the fatigue test data.It is shown that this corrected approach can accurately estimate the fatigue life of general large structures. It has high estimation accuracy, convenient implementation and extensive engineering application prospects.