| NiCr/ZrO2功能梯度复合材料中混合型准静态裂纹启裂的数字散斑相关方法实验研究 |
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| 引用本文： | 金鑫,吴林志,孙雨果,果立成,于红军.NiCr/ZrO2功能梯度复合材料中混合型准静态裂纹启裂的数字散斑相关方法实验研究[J].复合材料学报,2009,26(6):150-154. |
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| 作者姓名： | 金鑫 吴林志 孙雨果 果立成 于红军 |
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| 作者单位： | 哈尔滨工业大学复合材料与结构研究所,哈尔滨,150080 |
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| 摘 要： | 采用粉末冶金方法制备出NiCr/ZrO2功能梯度材料FGMs。通过2种断裂试件研究了材料梯度对混合型断裂行为的影响(FGM-A试件，裂纹位于试件的弹性模量较大一侧；FGM-B试件，裂纹位于试件的弹性模量较小一侧)。对2种断裂试件在非对称载荷下进行准静态断裂实验，并利用数字散斑相关方法测得Ⅰ、Ⅱ型应力强度因子。结果表明：FGM-A的裂纹的开裂角小于FGM-B的开裂角；FGM-A的弹性梯度对静态裂纹有保护作用；弹性模量的梯度变化和裂尖局部材料的断裂韧性会影响混合型裂纹的启裂。
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| 关 键 词： | 功能梯度材料 混合型裂纹 数字散斑方法 应力强度因子 断裂韧性 |
| 收稿时间： | 2008-11-04 |
| 修稿时间： | 2009-03-04 |
Experimental investigation of the quasi-static mixed-mode crack initiation in NiCr/ZrO_2 functionally graded materials by digital image correlation |
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| JIN Xin,WU Linzhi,SUN Yuguo,GU Licheng,YU Hongjun.Experimental investigation of the quasi-static mixed-mode crack initiation in NiCr/ZrO_2 functionally graded materials by digital image correlation[J].Acta Materiae Compositae Sinica,2009,26(6):150-154. |
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| Authors: | JIN Xin WU Linzhi SUN Yuguo GU Licheng YU Hongjun |
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| Affiliation: | (Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China) |
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| Abstract: | The NiCr/ZrO2 functionally graded materials(FGMs) were fabricated by the powder metallurgy.To study the effect of material gradient on the mixed-mode crack initiation,two types of fracture samples were prepared: FGM-A corresponding to the specimen with the crack situated on the stiffer side and FGM-B corresponding to the specimen with the crack situated on the compliant side.The quasi-static fracture tests were conducted under the unsymmetrical loading conditions,and the full-field digital image correlation... |
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| Keywords: | functionally graded materials mixed-mode crack digital image correlation stress intensity factors fracture toughness |
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