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| 不锈钢在扭转/拉伸复合载荷下近门槛值的疲劳裂纹扩展行为 | |
| 引用本文： | 于慧臣,孙燕国,张岩基,谢世殊,田中启介.不锈钢在扭转/拉伸复合载荷下近门槛值的疲劳裂纹扩展行为[J].金属学报,2006,42(2):186-190. |
| 作者姓名： | 于慧臣 孙燕国 张岩基 谢世殊 田中启介 |
| 作者单位： | 1. 北京航空材料研究院,北京,100095 2. 沈阳重型机械集团有限责任公司,沈阳,110025 3. 本溪钢铁集团有限责任公司,本溪,117100 4. 宝山钢铁集团公司技术中心,上海,201900 5. 名古屋大学工学部,名古屋,464-8603,日本 |
| 摘 要： | 研究了带环状预裂纹的奥氏体不锈钢圆棒试样在循环扭转／拉伸复合载荷下，门槛值附近的疲劳裂纹扩展行为，分析了复合加载时不同载荷比对裂纹扩展的影响，对裂纹扩展的初始阶段进行了详细研究，用应力强度因子表征了裂纹扩展开始的门槛值．提出了椭圆方程表达的疲劳裂纹扩展开始的门槛值模型，该方程可在裂纹尖端位移准则的基础上导出．疲劳裂纹扩展停止的门槛值条件也可用椭圆方程表达． |
| 关 键 词： | 扭转/拉伸复合加载 疲劳裂纹扩展 滑移接触 应力强度因子 门槛值 |
| 文章编号： | 0412-1961（2006）02-0186-05 |
| 收稿时间： | 2005-05-26 |
| 修稿时间： | 2005-05-262005-08-19 |
Near Threshold Fatigue Crack Propagation Under Combined Torsion And Tension In Stainless Steel |
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| YU Huichen,SUN Yanguo,ZHANG Yanji,XIE Shishu,TANAKA Keisuke.Near Threshold Fatigue Crack Propagation Under Combined Torsion And Tension In Stainless Steel[J].Acta Metallurgica Sinica,2006,42(2):186-190. | |
| Authors: | YU Huichen SUN Yanguo ZHANG Yanji XIE Shishu TANAKA Keisuke |
| Abstract: | Near-threshold fatigue crack propagation tests were conducted under combined torsion and tension on a circumferentially pre-cracked round bar of an austenite stainless steel. The propagation behavior was studied extensively under various combinations of cyclic loads. The threshold condition of fatigue crack extension was expressed by a quarter-elliptic function in terms of the stress intensity factor ranges for mode I and III. The equation can be derived on the basis of the crack-tip displacement criterion. The threshold condition for fracture is also expressed by another quarter-elliptic function. |
| Keywords: | combined torsion and tension fatigue crack propagation sliding contact stress intensity factor(SIF) threshold |
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