| 缺陷对EA4T车轴钢疲劳性能的影响 |
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| 引用本文： | 李行,张继旺,徐俊生,苏凯新,张金鑫,鲁连涛,吴明泽.缺陷对EA4T车轴钢疲劳性能的影响[J].西南交通大学学报,2021,56(3):627-633. |
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| 作者姓名： | 李行 张继旺 徐俊生 苏凯新 张金鑫 鲁连涛 吴明泽 |
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| 基金项目： | 国家自然科学基金（51675445，U1534209）； |
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| 摘 要： | 为了研究和准确评估不同尺寸的缺陷对EA4T车轴钢疲劳性能的影响，采用钻孔法在光滑试样表面人为引入缺陷，使用旋转弯曲疲劳试验机对光滑试样和不同尺寸缺陷的试样进行疲劳试验，以获得不同试样的疲劳极限；使用扫描电镜（SEM）观察断口形貌，使用Neuber公式（基于缺口敏感性）和修正的El-Haddad模型（基于断裂力学方法）评估带缺陷试样的疲劳极限. 研究结果表明:当试样等效缺陷尺寸小于59.64 μm时，其疲劳极限与光滑试样相同，都为360 MPa；当等效缺陷尺寸大于59.64 μm时，缺陷会降低光滑试样的疲劳极限，并且引入缺陷尺寸越大，疲劳极限越低；基于Neuber公式预测的疲劳强度能得到较为保守的疲劳强度估算值，而修正的El-Haddad模型可以更好地预测和评估不同尺寸的圆孔型三维缺陷对EA4T车轴钢疲劳强度的影响.
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| 关 键 词： | 缺陷 EA4T车轴钢 疲劳极限 Neuber公式 El-Haddad模型 |
| 收稿时间： | 2019-05-14 |
Effect of Defect on Fatigue Property of EA4T Axle Steel |
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| LI Hang,ZHANG Jiwang,XU Junsheng,SU Kaixin,ZHANG Jinxin,LU Liantao,WU Mingze.Effect of Defect on Fatigue Property of EA4T Axle Steel[J].Journal of Southwest Jiaotong University,2021,56(3):627-633. |
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| Authors: | LI Hang ZHANG Jiwang XU Junsheng SU Kaixin ZHANG Jinxin LU Liantao WU Mingze |
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| Abstract: | In order to accurately evaluate the effects of different size defects on the fatigue property of EA4T axle steel, the drilling method was used to artificially introduce defects on the surface of the smooth specimen, and the fatigue test was carried out to obtain the fatigue limits on the smooth specimens and the specimens with different size defects by the rotary bending fatigue machine. The fracture morphology was observed by a scanning electron microscopy (SEM). Finally, the fatigue limits of specimens with defects were assessed using Neuber's formula (based on notch sensitivity) and a modified El-Haddad model (based on fracture mechanics). The result show that when the defect size of the specimen is less than 59.64 μm, the fatigue limit is the same as the smooth specimen, both of which are 360 MPa, however, when the defect size is larger than 59.64 μm, the defect will reduce the fatigue limit of the smooth specimen, and the larger the introduced defect size, the lower the fatigue limit. Fatigue strength prediction based on the Neuber formula is conservative, however, the modified El-Haddad model can better predict and evaluate the effect of different size of 3D hole defects on the fatigue strength of EA4T axle steel. |
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