CAJ | 학술논문

利用多尺度模拟的方法建立了针对疲劳损伤累积过程中微裂纹成核与扩展阶段的疲劳损伤多尺度模型，对模型的有效性进行了实验验证，并将其应用于变幅疲劳载荷下某装甲车传动轴的疲劳寿命评估中。研究结果表明，所提模型能同时预测宏观尺度疲劳损伤与细观尺度微裂纹的成核与扩展率，利用该模型所预测的宏观疲劳损伤值与实验所测值相符。该模型既能合理地描述宏观尺度下不同应力水平的疲劳损伤演化过程，又能综合反映细观尺度下微裂纹的成核与扩展行为。利用这种多尺度疲劳损伤模型可以预测结构在疲劳微裂纹成核与扩展阶段所消耗的疲劳寿命，为各类结构疲劳损伤累积过程评估和准确进行寿命预测提供了一种新途径。
이용다척도모의적방법건립료침대피로손상루적과정중미렬문성핵여확전계단적피로손상다척도모형，대모형적유효성진행료실험험증，병장기응용우변폭피로재하하모장갑차전동축적피로수명평고중。연구결과표명，소제모형능동시예측굉관척도피로손상여세관척도미렬문적성핵여확전솔，이용해모형소예측적굉관피로손상치여실험소측치상부。해모형기능합리지묘술굉관척도하불동응력수평적피로손상연화과정，우능종합반영세관척도하미렬문적성핵여확전행위。이용저충다척도피로손상모형가이예측결구재피로미렬문성핵여확전계단소소모적피로수명，위각류결구피로손상루적과정평고화준학진행수명예측제공료일충신도경。
A multi-scale fatigue damage model is developed for describing fatigue accumulation dur-ing nucleation and micro-cracks growth by using the multi-scale method and its effectivity is verified by experiments.The multi-scale fatigue damage model is applied to predict the fatigue life of an ar-mored vehicle transmission shaft under variable-amplitude fatigue loading.The results show that the model can predict the fatigue damage and the rate of the nucleation and growth of micro-cracks.The fatigue damage values calculated by using the model are consistent with those measured by experi-ments.The multi-scale fatigue damage model can describe not only fatigue damage evolution under different levels of fatigue stress at the macro-scale,but also the behavior of the nucleation and growth of micro-cracks at the micro-scale.Therefore,the proposed model can predict the fatigue life of engineering structures on the process of accumulated fatigue due to the nucleation and growth of micro-cracks,and it provides a new method for the prediction of fatigue life.