| TC25钛合金低周疲劳特性与断口分析 |
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| 引用本文： | 罗希延,赵荣国,何伟,李红超,刘学晖,谭敦厚.TC25钛合金低周疲劳特性与断口分析[J].固体力学学报,2011(Z1). |
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| 作者姓名： | 罗希延 赵荣国 何伟 李红超 刘学晖 谭敦厚 |
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| 作者单位： | 湘潭大学土木工程与力学学院;中国航空工业集团黎阳航空发动机公司; |
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| 基金项目： | 湖南省教育厅优秀青年项目(11B125)资助 |
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| 摘 要： | 对TC25钛合金进行不同应力幅值下的低周疲劳试验,测试钛合金的低周疲劳寿命.在分析钛合金的低周疲劳应力应变迟滞回线的基础上,利用试验特性和应力应变本构关系,推导简化的Manson-Coffin公式,获取钛合金的应力-寿命曲线.最后,应用SEM对钛合金试样断口进行形貌观测,分析低周疲劳的断裂机理.结果表明,TC25钛合金的低周疲劳塑性变形,主要产生在加速断裂阶段.钛合金试样断面存在多处剪切唇,瞬时断裂由剪应力主导.钛合金的低周疲劳断裂以解理形核形成疲劳源,裂纹扩展存在多种模式,瞬断为准脆性断裂.
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| 关 键 词： | TC25钛合金 低周疲劳 断口分析 迟滞回线 |
ANALYSIS ON LOW CYCLE FATIGUE PROPERTIES AND FRACTOGRAPHY OF TC25 TITANIUM ALLOY |
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| Xiyan Luo, Rongguo Zhao Wei He Hongchao Li Xuehui Liu Dunhou Tan.ANALYSIS ON LOW CYCLE FATIGUE PROPERTIES AND FRACTOGRAPHY OF TC25 TITANIUM ALLOY[J].Acta Mechnica Solida Sinica,2011(Z1). |
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| Authors: | Xiyan Luo Rongguo Zhao Wei He Hongchao Li Xuehui Liu Dunhou Tan |
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| Institution: | Xiyan Luo1,2 Rongguo Zhao1 Wei He1 Hongchao Li1 Xuehui Liu2 Dunhou Tan1(1 College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan,411105)(2 Liyang Aero-Engine Corporation,Aviation Industry Corporation of China,Anshun,561102) |
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| Abstract: | The low cycle fatigue tests of TC25 titanium alloy under different stress amplitudes was carried out at ambient temperature,and the low cycle fatigue life was measured.Based on the analysis of stress-strain hysteresis loop of low cycle fatigue,the simplified Manson-Coffin equation was derived using both the experimental characteristics and the stress-strain constitutive relations of TC25 titanium alloy,and the stress-fatigue life curve was obtained.Finally,the fracture surface morphologies of TC25 titanium ... |
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| Keywords: | TC25 titanium alloy low cycle fatigue fractography hysteresis loop |
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