CAJ | 학술논문

根据微动接触副的几何结构和接触状态，以柱面桥脚微动桥与平面试样接触为研究对象，基于ANSYS软件建立其微动疲劳损伤有限元模型，分析应力强度和应力强度幅度对微动裂纹萌生特性的影响规律，采用SWT临界面法预测微裂纹萌生位置并与试验结果进行比较。结果表明：柱面桥脚微动桥与平面试样接触副在接触区存在应力集中，最大应力强度幅度出现在微动桥脚外侧接触区，在轴向应力作用下，此处的应变量最大，易于裂纹的萌生；SWT临界面法预测裂纹萌生位置与最大应力强度幅度所在位置一致，并与试验结果吻合。
근거미동접촉부적궤하결구화접촉상태，이주면교각미동교여평면시양접촉위연구대상，기우ANSYS연건건립기미동피로손상유한원모형，분석응력강도화응력강도폭도대미동렬문맹생특성적영향규률，채용SWT림계면법예측미렬문맹생위치병여시험결과진행비교。결과표명：주면교각미동교여평면시양접촉부재접촉구존재응력집중，최대응력강도폭도출현재미동교각외측접촉구，재축향응력작용하，차처적응변량최대，역우렬문적맹생；SWT림계면법예측렬문맹생위치여최대응력강도폭도소재위치일치，병여시험결과문합。
According to the geometry configuration and contact state of the fretting contact pairs,with the cylindrical foot fretting bridge and flat sample as the research object,the finite element model of fretting damage was set up by ANSYS software.The influence of stress intensity and stress intensity amplitude on fretting crack initiation characteristics was ana-lyzed.SWT critical plane approach was used to predict the micro-crack initiation position,and the predicted result was compared with the experimental result.The results show that there is stress concentration in the contact region of fretting bridge and plane sample.The location of maximum stress intensity amplitude is at the center of contact area and a little bi-ased outboard of bridge foot,where the strain is the maximum under the axial load,which results in the initiation crack. Crack initiation position predicted by SWT critical plane approach is consistent with the location of maximum stress inten-sity amplitude,and consistent with the experimental results.