| 缺口对转向架用SMA490BW钢的疲劳性能的影响 |
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| 引用本文： | 许 良,苏居季,周 松.缺口对转向架用SMA490BW钢的疲劳性能的影响[J].科学技术与工程,2018,18(31). |
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| 作者姓名： | 许 良 苏居季 周 松 |
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| 作者单位： | 沈阳航空航天大学,沈阳航空航天大学,沈阳航空航天大学 |
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| 基金项目： | 国家自然科学青年基金(51405309),辽宁省自然科学基金(2015020183)。 |
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| 摘 要： | 基于高速列车转向架在运行进程中常因承受各种交变载荷而导致疲劳断裂问题,针对CRH2高速列车转向架用SMA490BW钢试样进行拉伸试验,确保SMA490BW钢的力学性能符合标准要求下,对此种钢进行疲劳性能研究并通过扫描电镜进行断口分析。结果表明：与光滑试件(kt = 1)相比缺口试件(kt = 3),疲劳极限应力减小了61％,S-N曲线左侧的斜率更大；其缺口敏感系数为0.786；光滑试样的裂纹源为角部裂纹,缺口试样的裂纹源为表面裂纹。
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| 关 键 词： | SMA490BW钢 应力集中系数 S-N曲线 缺口敏感系数 |
| 收稿时间： | 2018/6/20 0:00:00 |
| 修稿时间： | 2018/8/25 0:00:00 |
Influence of notch on fatigue performance of SMA490BW steel |
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| xu liang,Su Juji and.Influence of notch on fatigue performance of SMA490BW steel[J].Science Technology and Engineering,2018,18(31). |
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| Authors: | xu liang Su Juji and |
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| Institution: | SHENYANG AEROSPACE UNIVERSITY,SHENYANG AEROSPACE UNIVERSITY, |
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| Abstract: | Due to the fact that high-speed train bogies often suffer from fatigue fracture due to various alternating loads in the course of operation, tensile tests are performed on CRH2 high-speed train bogies using SMA490BW steel specimens to ensure that the mechanical properties of SMA490BW steel meet the standard requirements. The fatigue properties of this steel were tested under different stress concentration factors and analyzed by scanning electron microscopy. The results show that the fatigue limit stress of the notched specimen is 61% lower than that of the smooth specimen, and the slope of the left section of the SN curve is larger; the notch sensitivity coefficient is 0.786; the crack source of the smooth specimen is the corner crack. The crack source of the notched specimen is a surface crack. |
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| Keywords: | SMA490BW steel stress concentration factor S-N curve notch sensitivity factor |
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