| 扩展裂纹尖端奇异场的实验研究 |
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| 引用本文： | 刘宝琛,蔺书田. 扩展裂纹尖端奇异场的实验研究[J]. 力学学报, 1991, 23(5): 606-616. DOI: 10.6052/0459-1879-1991-5-1995-883 |
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| 作者姓名： | 刘宝琛 蔺书田 |
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| 作者单位： | 清华大学力学系 |
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| 摘 要： | 用云纹方法测量了 LY12-M 铝材,双边裂纹试件、扩展裂纹沿 x和y方向位移场u_x,u_y。实验的裂纹尖端奇异场与 GH 理论奇异场进行了比较。两者偏差在±10％范围内,得到实验的 GH 奇异场范围与形状。实验证明:扩展裂纹尖端场有(lnA/r)~(α+1)奇异主导区。该主导区形状由腰子形向扁圆、圆形过渡,接近裂纹扩展时形状不规则。在 GH 主导区内,裂纹尖端附近有一个三维贲形,材料损伤区。在该区内 GH 奇异性不存在。
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| 关 键 词： | 裂纹尖端 奇异场 损伤区 云纹法 |
EXPERIMENTAL GH SINGULARITY FIELD AROUND GROWING CRACK TIP |
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| B. C. Liu and S. T. Lin. EXPERIMENTAL GH SINGULARITY FIELD AROUND GROWING CRACK TIP[J]. chinese journal of theoretical and applied mechanics, 1991, 23(5): 606-616. DOI: 10.6052/0459-1879-1991-5-1995-883 |
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| Authors: | B. C. Liu and S. T. Lin |
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| Abstract: | The displacement fields ux,uy of growing crack tip for LY12-M material specimens with double edge cracks are measured using Moire method. The experimental singularity fields are compared with GH theoretical field. The size and shape of the experimental GH singularity fields are obtained. The di screpancy of experiment and theory is within ±10%. The experiments show thatthere is (InA/r)α+1 singularity dominant around growing crack tip. The shape of thisregion of dominant singularity are batterfly wing, then ... |
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| Keywords: | crack tip singularity field damage zone Moire method |
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