摘要
为研究沟槽类缺陷对EA4T车轴钢疲劳性能的影响规律,用线切割方法在试样上预置沟槽性缺陷,采用旋转弯曲试验方法测定光滑试样和含缺陷试样疲劳性能,绘制光滑和含缺陷试样的S-N曲线。通过扫描电子显微镜观察不同深度缺陷的疲劳断口,运用修正的Murakami模型预测试样疲劳强度。结果显示:疲劳裂纹萌生于预置缺陷处,缺陷尺寸对疲劳性能有显著影响,疲劳极限随着缺陷深度的增加而降低,疲劳强度的预测值与实际值的误差范围在20%之内。
In the interest of studying on the effects of groove defects on the fatigue performance of EA4 T axle steel,the grooving defects are preset on the specimens by wire-electrode cutting method. The rotary bending test is used to measure the fatigue performance of both smooth and groove defect specimens. The fatigue S-N curve of smooth and groove defect specimens was drawn. The fatigue fracture surfaces of the specimens with different depth defects were observed by scanning electron microscopy, and the fatigue resistance of the specimens was predicted by using the modified Murakami model. The results show that the fatigue crack originates at the preset defect. The size of the defect has a significant effect on the fatigue performance, such as the fatigue limit decreases with the increase of the defect depth. The error between the predicted and the actual fatigue strength is within 20%.
作者
尹鸿祥
吴毅
张关震
霍锋锋
张弘
YIN Hongxiang;WU Yi;ZHANG Guanzhen;HUO Fengfeng;ZHANG Hong
出处
《铁道技术监督》
2019年第8期20-24,共5页
Railway Quality Control
基金
国家重点研发计划(2017YFB0304600)
中国铁道科学研究院基金(2018YJ173)
中国铁道科学研究院基金(2017YJ089)
作者简介
尹鸿祥,助理研究员;吴毅,助理研究员;张关震,助理研究员;霍锋锋,工程师;张弘,研究员
