| 罗云蓉,王清远,付磊*,张应迁,陶静,谢文玲.地震频率对Q235钢结构材料超低周疲劳行为的影响[J].实验力学,2018,33(5):743~750 |
| 地震频率对Q235钢结构材料超低周疲劳行为的影响 |
| On the effect of seismic frequency on extremely low cycle fatigue behaviors of Q235 steel structure material |
| 投稿时间：2017-04-24 修订日期：2017-07-20 |
| DOI：10.7520/1001-4888-17-100 |
| 中文关键词: 钢结构材料 超低周疲劳 频率影响 寿命预测 |
| 英文关键词:steel structure materials extremely low cycle fatigue (ELCF) Frequency effect life prediction |
| 基金项目:国家自然科学基金(51301115)，材料腐蚀与防护四川省重点实验室基金(2016CL17， 2012CL10)，四川理工学院人才引进项目(2015RC34), 过程装备与控制四川省高等学校重点实验室(GK201708， GK201716),桥梁无损检测与工程计算四川省高等学校重点实验室项目(2018QYJ03， 2018QZY01) |
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| 中文摘要: |
| 研究了两种地震极限频率对于Q235钢结构材料的超低周疲劳性能的影响。采用横向应变控制方法，分别保持频率1Hz、3Hz恒定，在岛津电液伺服疲劳试验机上开展了试验钢的超低周疲劳试验。研究发现，循环应力响应特征，循环应力-应变关系，以及疲劳寿命均与频率相关，且在较高频率下，试验材料出现了二次循环硬化现象。分别建立了试验钢在两种频率下基于塑性应变幅值及应变速率的疲劳寿命预测公式。两种寿命预测公式均与试验结果吻合良好。通过电镜扫描(SEM)，对比分析了不同频率下试验钢超低周疲劳下的微观断裂机理。 |
| 英文摘要: |
| In this paper, the effect of two kinds of seismic limit frequencies on the extremely low cycle fatigue (ELCF) performance of Q235 steel structural material are investigated. ELCF experiment for the tested steel was carried out on Shimadzu electro-hydraulic servo fatigue testing machine by using the transverse strain control method and keeping the frequency of 1 Hz and 3 Hz, respectively. It is found that the response characteristics of cyclic stress, the cyclic stress-strain relationship and fatigue life are all related to frequency, and secondary cyclic hardening of tested material occurs at higher frequencies. Based on plastic strain amplitude and strain rate, the fatigue life prediction formulas of tested steel were established respectively, under both frequency condition. The two life prediction formulas are in good agreement with the experimental results. Finally, by using scanning electron microscope (SEM), the microscopic fracture mechanism of tested steel under extremely low cycle fatigue at different frequencies was compared and analyzed. |
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