| 拱形试件动态断裂的动光弹分析 |
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| 引用本文： | 沈家瑶,冯英先,刘新华,宋刚,吴树森.拱形试件动态断裂的动光弹分析[J].实验力学,1987,2(1). |
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| 作者姓名： | 沈家瑶 冯英先 刘新华 宋刚 吴树森 |
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| 作者单位： | 华东工学院，华东工学院，华东工学院，华东工学院，华东工学院 |
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| 摘 要： | 本文采用动光弹方法,分析了对带边裂纹的拱形三点弯曲试件在抢击加载条件下的瞬态反应。从多火花动光弹仪记录下来的16幅断裂过程的照片和微机输出的电火花光信号图上,得到了各时刻的等差线图形和裂纹长度。使用运动裂纹尖端附近的应力场解,去计算动应力强度因子。对环氧树脂材料,测定了动态应力强度因子与裂纹扩展速度之间的关系,并给出了当裂纹扩展速度达到410m/s时,为裂纹产生分叉的条件。
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| 关 键 词： | 断裂 动态光弹性 |
Photoelastic Analysis of Dynamic Fracture in Arch Specimen |
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| Shen Jiayao Feng Yingxian Liu Xinhua Song Gang Wu Shusen.Photoelastic Analysis of Dynamic Fracture in Arch Specimen[J].Journal of Experimental Mechanics,1987,2(1). |
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| Authors: | Shen Jiayao Feng Yingxian Liu Xinhua Song Gang Wu Shusen |
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| Institution: | East China Institute of Technology |
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| Abstract: | In this paper, the transient response of three-points bending arch specimens with crack under impact is analyzed by means of dynamic photoelasticity. From 16 photographs of fracture process recorded by multiplespark camera, the isochromatic pattern and crack length of each moment are obtained. The stress field near a crack tip obtained therefrom is used to calculate dynamic stress intensity factor and the relation between this factor and crack propagating velocity of epoxy resin can then be determined. |
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| Keywords: | photoelasticity dynamic fracture |
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