含缺陷结构的冲击断裂试验研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (15) : 103-108.

论文

含缺陷结构的冲击断裂试验研究

杨仁树1,2，丁晨曦1，杨立云1，陈程1，孙金超1

作者信息 +

Experimental study on structures with flaws under impact loading

YANG Ren-shu1,2, DING Chen-xi1, YANG Li-yun1, CHEN Cheng1, SUN Jin-chao1

Author information +

文章历史 +

摘要

利用新型数字激光动态焦散线试验系统和落锤冲击加载平台，以缺陷端部曲率为单一变量，将孔状缺陷和裂纹缺陷纳入同一个试验研究体系。研究了冲击荷载下，含不同端部曲率中央缺陷的PMMA条形试件的三点弯曲动态断裂过程，断裂破坏经历三个阶段：前期为冲击应力波作用下，试件下边界裂纹的起裂与扩展；中期为裂纹在缺陷处的应力释放和停滞；后期为落锤自重作用下，缺陷端部的起裂与试件贯穿。在相同的试验条件下，不同端部曲率的缺陷对前期裂纹起裂与扩展基本没有影响；缺陷端部曲率越大，中期缺陷处停滞时间越短，并得出二者之间的近似函数关系；后期缺陷端部起裂时的应力强度因子随着缺陷端部曲率的增大呈现出先减小后增大的变化趋势。

Abstract

Using the test system of digital laser dynamic caustics (DLDC) and experimental impacting platform of drop hammer, hole and crack flaws were brought into one experimental research system with single variable of curvature. Dynamic three point bending test of strip PMMA specimens with different flaws under impact loading was studied. Fracture failure experienced three stages: crack initiation and propagation at bottom border of specimens duo to impact stress wave during initial stage; stress release and crack stagnation at flaws during medium stage; crack initiation at top tips of flaws and running through specimens duo to the weight of drop hammer during ultimate stage. Under the same test condition, changes of curvature at flaw tips almost had no effect on crack initiation and propagation during initial stage; stagnation time became shorter with curvature increasing at flaw tips during medium stage, proximate functional relationship between the two was obtained; the stress intensity factors of crack initiation at flaw tips decreased first and then increased with the curvature increasing within limits during ultimate stage.

导出引用

杨仁树1,2，丁晨曦1，杨立云1，陈程1，孙金超1. 含缺陷结构的冲击断裂试验研究[J]. 振动与冲击, 2016, 35(15): 103-108

YANG Ren-shu1,2, DING Chen-xi1, YANG Li-yun1, CHEN Cheng1, SUN Jin-chao1. Experimental study on structures with flaws under impact loading[J]. Journal of Vibration and Shock, 2016, 35(15): 103-108

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