单边偏置裂纹相互作用的实验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (17) : 121-127.

论文

单边偏置裂纹相互作用的实验研究

杨仁树1,2，陈程1，付晓强1，林海1，丁晨曦1

作者信息 +

Tests for interaction of unilateral offset cracks

YANG Ren-shu1,2 CHEN Cheng1 FU Xiaoqiang1 LIN Hai1 DING Chenxi1

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文章历史 +

摘要

为研究脆性介质中裂纹相互作用对裂纹扩展形态的影响，以有机玻璃（PMMA）为相似材料，采用动态焦散线实验方法开展了三点弯冲击动力学实验研究。结果表明：冲击荷载条件下，裂纹间相互作用影响裂纹起裂时间、裂纹尖端应力场以及裂纹偏转方向。裂纹相互作用使得裂纹起裂时应力强度因子KId降低，起裂所需能量累积时间缩短；裂纹扩展初始阶段，单偏置裂纹尖端应力场剪应力分量为正，应力强度因子KIId大于0，单边偏置平行双裂纹相同位置处裂纹尖端应力场剪应力分量为负，KIId小于0；裂纹距离中心位置10mm的情况下，单偏置裂纹起裂后向内侧偏转，单边偏置平行双裂纹相同位置处裂纹向外侧偏转。

Abstract

Here, in order to study effects of cracks interaction in brittle medium on crack growth morphology, the dynamic caustics method was used to conduct 3-point bend impact dynamic tests taking PMMA as a similar material.The results showed that under the condition of impact load, cracks interaction affects crack initiation time, crack tip stress field and crack deflection direction; cracks interaction causes decreases in stress intensity factor KdI during crack initiation and time required for crack initiation energy accumulation; in initial stage of crack propagation, shear stress component of single-offset crack tip stress field is positive and stress intensity factor KdII is larger than zero, while shear stress component of crack tip stress field at the same position of unilateral offset parallel double cracks is negative and KdII is less than zero; when crack position is 10 mm away from center position, a single-offset crack deflects to inside after its initiation, a crack at the same positon of unilateral offset parallel double cracks deflects to outside.

导出引用

杨仁树1,2，陈程1，付晓强1，林海1，丁晨曦1. 单边偏置裂纹相互作用的实验研究[J]. 振动与冲击, 2019, 38(17): 121-127

YANG Ren-shu1,2 CHEN Cheng1 FU Xiaoqiang1 LIN Hai1 DING Chenxi1. Tests for interaction of unilateral offset cracks[J]. Journal of Vibration and Shock, 2019, 38(17): 121-127

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