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| 不锈钢在扭转/拉伸复合载荷下的低周疲劳裂纹扩展 | |
| 引用本文： | 于慧臣,孙燕国,谢世殊,田中启介. 不锈钢在扭转/拉伸复合载荷下的低周疲劳裂纹扩展[J]. 金属学报, 2005, 41(1): 73-78 |
| 作者姓名： | 于慧臣 孙燕国 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. 宝山钢铁集团公司技术中心,上海,201900 4. School of Engineering,Nagoya University,Nagoya 464-8603,Japan |
| 摘 要： | 研究了从SUS316NG不锈钢圆捧试样的环状预裂纹开始的低周疲劳裂纹扩展行为，分析了扭转／拉伸复合加载时不同载荷比对弹塑性疲劳裂纹扩展的影响．用J积分的指数方程表达了简单加载及复合加载的裂纹扩展速率．对于同样的J积分范围值，Ⅰ型载荷下的裂纹扩展速率最高，而Ⅲ型载荷下的速率最低．裂纹断口在高应力水平下为宏观平坦，在复合加载条件下的疲劳断口上观察到了疲劳条痕，同Ⅰ型加载条件下的相同，疲劳条痕间距与裂纹扩展速率二者数值相等． |
| 关 键 词： | 低周疲劳 裂纹扩展 J积分 扭转／拉伸复合加载 |
| 文章编号： | 0412-1961(2005)01-0073-06 |
| 收稿时间： | 2004-01-13 |
| 修稿时间： | 2004-06-07 |
Low Cycle Fatigue Crack Propagation in Stainless Steel Under Combined Torsion and Tension |
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| YU Huichen,SUN Yanguo,XIE Shishu,K. TANAKA. Low Cycle Fatigue Crack Propagation in Stainless Steel Under Combined Torsion and Tension[J]. Acta Metallurgica Sinica, 2005, 41(1): 73-78 | |
| Authors: | YU Huichen SUN Yanguo XIE Shishu K. TANAKA |
| Affiliation: | Beijing Institute of Aeronautical Materials, Beijing 100095 |
| Abstract: | Low cycle fatigue crack propagation tests wereconducted on a circumferentially pre--cracked roundbar of a stainless steel under various combinations ofcyclic torsion and tension. The crack propagation rate wasexpressed as a power function of $J$ integral range for both single andmixed mode. For the same $J$--integral range,the mode I propagation rate is the highest andthe mode III one is the lowest. The fatigue fracture surface ismacroscopically flat under the conditions of excessive plasticity.Striations were observed on the fatigue fracturesurface under mixed mode loading, and theirspacing value is equal to the crack propagation rate value,the same as in mode I case. |
| Keywords: | low cycle fatigue crack propagation J integral combined torsion and tension |
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