| 微裂纹串级连接及临界破坏 |
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| 引用本文： | 卢春生,白以龙.微裂纹串级连接及临界破坏[J].上海力学,1994,15(4):1-7. |
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| 作者姓名： | 卢春生 白以龙 |
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| 作者单位： | 中国科学院力学研究所非线性连续介质力学开放实验室
(卢春生，白以龙，凌中，夏蒙棼)，中国科学院力学研究所非线性连续介质力学开放实验室(柯孚久) |
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| 基金项目： | 攀登计划《非线性科学》，国家自然科学基金 |
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| 摘 要： | 对一铝合金材料层裂过程的实验研究发现，当损伤累积到一定程度时，受损材料的残余强度突然丧失，表现出临界破坏现象。层裂表面具有分形特征，其分形断面的形成归因于大量微裂纹的串级连接。据此提出了一重正化群弱面模型，并对损伤演化后期的临界破坏现象进行了初步的分析和探讨。
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| 关 键 词： | 微裂纹串级连接 临界破坏 铝合金 材料力学 |
CASCADE COALESCENCE OF MICROCRACKS AND CRITICAL FAILURE |
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| Lu Chunsheng Bai Yilong Ling Zhong Xia Mengfen Ke Fujiu.CASCADE COALESCENCE OF MICROCRACKS AND CRITICAL FAILURE[J].Chinese Quarterly Mechanics,1994,15(4):1-7. |
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| Authors: | Lu Chunsheng Bai Yilong Ling Zhong Xia Mengfen Ke Fujiu |
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| Abstract: | Experimental tests on an aluminium alloy reveal that the residual strength of the alloy, subj ected to planar impact, shows a critical transition to complete failure at a certain level of accumulative damage. Microscopic observations and fractography of the spalled surface unveil fractal feature in a certain range of length scale. It shows that critical failure in spallation results from a cascade of coalescence of microcracks. In view of this fact, a renormalization group model Of weak surfaces in combination with mechanical analysis is used to understand the physical mechanism underlying the coalescence of microcracks to critical failure of the material. |
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| Keywords: | Spallation Cascade coalescence of microcracks Fractal Critical failure Renormalization group |
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