| PMMA材料断裂应力与银纹损伤研究 |
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| 引用本文： | 孙鹰,张平.PMMA材料断裂应力与银纹损伤研究[J].材料科学与工程学报,2005,23(1):92-95. |
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| 作者姓名： | 孙鹰 张平 |
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| 作者单位： | 湘潭大学,土木工程与力学学院,湖南,湘潭,411105;湘潭大学,土木工程与力学学院,湖南,湘潭,411105 |
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| 基金项目： | 国家自然科学基金
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湖南省自然科学基金 |
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| 摘 要： | 本文基于连续介质力学理论和最大拉应力准则,从能量的观点出发,根据能量守恒定律,提出了脆性材料的断裂应变能密度与断裂应变成线性关系,由此确定的平均应力为材料常数.并通过PMMA材料在不同应变率下的拉伸实验验证.同时通过表面银纹显微镜观察实验,研究了应变率对银纹密度的影响.
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| 关 键 词： | 应变能密度 断裂 应变率 失效准则 银纹密度 |
| 文章编号： | 1004-793X(2005)01-0092-04 |
| 修稿时间： | 2004年4月21日 |
Maximum Drawing Stress Criterion |
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| SUN Ying,ZHANG Ping.Maximum Drawing Stress Criterion[J].Journal of Materials Science and Engineering,2005,23(1):92-95. |
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| Authors: | SUN Ying ZHANG Ping |
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| Abstract: | Based on the theory of continuum mechanics and maximum tensile stress criterion and conservation law of energy, this paper has proposed that fracture strain energy density of brittle materials is linear with their fracture strain, and that average stress decided by them is a material constant, which have been verified by PMMA materials tensile test at the different loading rates. At the same time, through the microscope test of surface, the effect on craze density by strain rate has been investigated as well. |
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| Keywords: | strain energy density fracture strain rate failure criterion craze density |
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