冲击荷载下深梁动态断裂行为的光弹性实验

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (19) : 236-241.

论文

冲击荷载下深梁动态断裂行为的光弹性实验

岳中文，宋耀，杨仁树，王煦，邱鹏，陈程

作者信息 +

Photoelastic experiment of deep beam fracture behaviors under impact load

YUE Zhong-wen SONG Yao YANG Ren-shu WANG Xu QIU Peng CHEN Cheng

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文章历史 +

摘要

采用动态光弹性实验方法，对简支深梁进行冲击实验，研究其冲击动态断裂行为。实验得到了冲击断裂过程中深梁的等差条纹变化图片，分析了冲击荷载下裂纹尖端的动态应力强度因子和裂纹扩展速度的变化规律。研究结果表明：由于应力波的作用，在试件开裂前，预制裂纹尖端应力强度因子始终呈波动上升的趋势，最大值为1.995 ；试件起裂后，裂尖动态应力强度因子先迅速下降，然后保持在1.222 至1.677 的范围内震荡，平均值为1.458 ；裂纹起裂后，扩展速度先迅速增大，后保持在310m/s至380m/s之间，动态裂纹基本呈匀速扩展，平均扩展速度为345.703m/s。

Abstract

By using dynamic photoelastic method, the impact experiments were performed to study the dynamic fracture behaviors of simply supported deep beams. The isochromatic fringe patterns of the deep beams were obtained during the fracture process. The dynamic stress intensity factors (DSIF) and propagation velocities of the crack tips were calculated and analyzed in this paper. The results are shown as follows: the DSIF of the crack tip keeps increasing with fluctuation before the initiation as a consequence of stress waves, reaching the maximum value of 1.995 ; after the initiation, the DSIF decreases rapidly at first, and then stays oscillating within a range from 1.222 to 1.677 . The mean value of DSIF is 1.458 . The propagation velocity of crack after the initiation rises drastically at the beginning, and retains between 310m/s and 380m/s afterwards. The dynamic crack keeps a constant extension basically, and the average velocity is 345.703m/s.

导出引用

岳中文，宋耀，杨仁树，王煦，邱鹏，陈程 . 冲击荷载下深梁动态断裂行为的光弹性实验[J]. 振动与冲击, 2017, 36(19): 236-241

YUE Zhong-wen SONG Yao YANG Ren-shu WANG Xu QIU Peng CHEN Cheng. Photoelastic experiment of deep beam fracture behaviors under impact load[J]. Journal of Vibration and Shock, 2017, 36(19): 236-241

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