| 钛合金Ⅰ型裂纹应力强度因子测试的实验研究 |
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| 引用本文： | 代树红,王召,张立新.钛合金Ⅰ型裂纹应力强度因子测试的实验研究[J].兵器材料科学与工程,2013,36(1):91-95. |
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| 作者姓名： | 代树红 王召 张立新 |
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| 作者单位： | 辽宁工程技术大学力学与工程学院,辽宁阜新,123000;沈阳黎明航空发动机(集团)公司,辽宁沈阳,110043 |
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| 摘 要： | 采用疲劳裂纹预制机对含I型缺口的TC4合金试件预制裂纹，通过数字图像相关方法观测试件在三点弯曲加载条件下裂纹的扩展过程及裂尖区域的位移场，将位移场数据带入裂尖位移场方程，计算裂尖位置和应力强度因子。结果表明，采用该方法可以准确测定钛合金的I型裂纹应力强度因子、裂尖位置及裂纹扩展长度。该方法解决了以往研究中因不能准确测定裂纹尖端位置，而无法准确测定钛合金I型裂纹应力强度因子的难题
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| 关 键 词： | 数字图像相关方法 钛合金 Ⅰ型裂纹应力强度因子 裂纹尖端位置 裂纹扩展长度 |
Experimental study on evaluation of mode Ⅰ stress intensity factor of Ti alloy |
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| DAI Shuhong
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WANG Zhao
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ZHANG Lixin.Experimental study on evaluation of mode Ⅰ stress intensity factor of Ti alloy[J].Ordnance Material Science and Engineering,2013,36(1):91-95. |
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| Authors: | DAI Shuhong WANG Zhao ZHANG Lixin |
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| Affiliation: | 1.School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China; 2.Shenyang Liming Aero-Engine(Group) Corporation,Shenyang 110043,China) |
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| Abstract: | A precrack was made in front of the notch of TC4 alloy specimen before testing,the displacement contour maps around the crack tip were measured by digital image correlation method during the loading process,then inputted the data into the displacement equations of crack tip,and the equations were solved.The experimental results show that the mode Ⅰ crack stress intensity factor,crack tip position and crack extension length of TC4 alloy specimen can be accurately evaluated from displacement components by the proposed method,and the evolution features of stress intensity factor and crack extension are revealed during the loading process. |
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| Keywords: | DICM Ti alloy mode Ⅰ stress intensity factor crack tip position crack extension length |
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