压应力场中爆生裂纹分布与扩展特征实验分析

杨立云 马佳辉 王学东 张五成 张磊

杨立云, 马佳辉, 王学东, 张五成, 张磊. 压应力场中爆生裂纹分布与扩展特征实验分析[J]. 爆炸与冲击, 2017, 37(2): 262-268. doi: 10.11883/1001-1455(2017)02-0262-07
引用本文: 杨立云, 马佳辉, 王学东, 张五成, 张磊. 压应力场中爆生裂纹分布与扩展特征实验分析[J]. 爆炸与冲击, 2017, 37(2): 262-268. doi: 10.11883/1001-1455(2017)02-0262-07
Yang Liyun, Ma Jiahui, Wang Xuedong, Zhang Wucheng, Zhang Lei. Experimental study on blasting crack initiation and propagation behaviorin compression stress field[J]. Explosion And Shock Waves, 2017, 37(2): 262-268. doi: 10.11883/1001-1455(2017)02-0262-07
Citation: Yang Liyun, Ma Jiahui, Wang Xuedong, Zhang Wucheng, Zhang Lei. Experimental study on blasting crack initiation and propagation behaviorin compression stress field[J]. Explosion And Shock Waves, 2017, 37(2): 262-268. doi: 10.11883/1001-1455(2017)02-0262-07

压应力场中爆生裂纹分布与扩展特征实验分析

doi: 10.11883/1001-1455(2017)02-0262-07
基金项目: 

国家自然科学基金项目 51404273

高等学校博士学科点专项科研基金(新教师类)项目 20120023120020

详细信息
    作者简介:

    杨立云(1983—),男,博士,副教授,yangly@cumtb.edu.cn

  • 中图分类号: O381;O348.2

Experimental study on blasting crack initiation and propagation behaviorin compression stress field

  • 摘要: 采用动静组合加载实验装置和数字激光焦散线实验系统,进行了0、3、6、9 MPa等4种压应力场中PMMA试件的爆破致裂实验,分析了沿静态主应力方向扩展的裂纹运动学和力学行为。实验结果表明:首先,静态竖向载荷在预制炮孔周围产生应力集中,在炮孔壁上下端部处出现最大拉应力;随后,在动态爆炸载荷的叠加作用下,裂纹优先在炮孔壁上最大拉应力位置处起裂,并沿最大主应力方向扩展;裂纹扩展过程中,静态竖向载荷越大,裂纹扩展速度越大,且裂纹尖端应力强度因子值越大。
  • 图  1  裂纹尖端焦散线示意图

    Figure  1.  Schematic illustration of caustics at a crack tip

    图  2  圆孔周围焦散线示意图

    Figure  2.  Schematic illustration of caustics surrounding a circle hole

    图  3  新型焦散线实验系统

    Figure  3.  Optical setup of new-type caustics system

    图  4  动静组合加载系统

    Figure  4.  Static and dynamic combination loading system

    图  5  围压作用下炮孔周围的焦散线

    Figure  5.  Caustics induced by the compression

    图  6  爆破后的试件

    Figure  6.  Specimens after blasting

    图  7  不同时刻的焦散线照片(试件S4)

    Figure  7.  Caustics of specimen S4 at different times

    图  8  裂纹扩展长度随时间的变化

    Figure  8.  Crack length varying with time

    图  9  应力强度因子随时间的变化

    Figure  9.  Dynamic stress intensity factor varying with time

    表  1  炮孔周围静态焦散线结果

    Table  1.   Result of caustics surrounding the blasthole

    (p-q)/MPaD/mm
    理论实验
    06.06.0
    311.111.0
    613.213.0
    914.614.5
    下载: 导出CSV
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出版历程
  • 收稿日期:  2015-09-17
  • 修回日期:  2015-12-26
  • 刊出日期:  2017-03-25

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