| 李永正,张世鑫,王珂*,黄翔宇,李艳青,白旭.海洋结构物用钛合金材料保载-疲劳裂纹扩展影响因素试验研究[J].实验力学,2020,35(6):1157~1162 |
| 海洋结构物用钛合金材料保载-疲劳裂纹扩展影响因素试验研究 |
| Experimental study on factors affecting the dwell-fatigue crack growth of titanium alloy materials for marine structures |
| 投稿时间：2019-10-11 修订日期：2019-12-10 |
| DOI：10.7520/1001-4888-19-184 |
| 中文关键词: 钛合金 保载-疲劳 载荷比 保载时间 氧化 |
| 英文关键词:titanium alloy dwell-fatigue load ratio dwell time oxidation |
| 基金项目:国家自然科学基金 (51709134)；青年基金项目(BK20160559)；国家重点研发计划子课题(2016YFC0300603-02)资助 |
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| 中文摘要: |
| 本文针对某一海洋结构物所用的高强度钛合金材料，开展恒幅循环载荷下氧化环境与非氧化环境、保载时间和载荷比的保载-疲劳裂纹扩展行为试验，探讨不同外部环境、不同保载时间和不同载荷比对其保载-疲劳裂纹扩展行为的影响。结果表明：两种外部环境(即室温氧化环境与室温非氧化环境)对该钛合金材料保载-疲劳裂纹扩展无明显影响；载荷峰值处保载时间的增加将会极大地缩短保载-疲劳循环寿命，该钛合金保载-疲劳裂纹扩展行为表现出明显的保载时间和应力强度因子范围的敏感性；随着载荷比的提高，保载-裂纹扩展速率增加。 |
| 英文摘要: |
| The dwell-fatigue crack propagation tests are carried out on the compact tensile specimens of a titanium alloy used for marine structures. The oxidation and non-oxidation environments under constant amplitude loads are considered. Effects of external environmental conditions, dwell-times and load ratios on the crack growth behavior of titanium alloy materials are discussed. The results show that two external environmental conditions, namely room temperature oxidation environment and room temperature non-oxidation environment, hardly affect the dwell-fatigue crack growth of titanium alloy materials. The increase of dwell time greatly shortens the dwell-fatigue crack growth life, and the dwell-fatigue crack growth behavior of the current titanium alloy exhibits significant sensitivities to dwell time and stress intensity factor range. As the load ratio increases, the dwell-fatigue crack propagation becomes much faster. |
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