爆炸荷载下青砂岩动态起裂韧度的测试方法

肖定军 朱哲明 蒲传金 陆路 胡荣

肖定军, 朱哲明, 蒲传金, 陆路, 胡荣. 爆炸荷载下青砂岩动态起裂韧度的测试方法[J]. 爆炸与冲击, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516
引用本文: 肖定军, 朱哲明, 蒲传金, 陆路, 胡荣. 爆炸荷载下青砂岩动态起裂韧度的测试方法[J]. 爆炸与冲击, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516
XIAO Dingjun, ZHU Zheming, PU Chuanjin, LU Lu, HU Rong. Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading[J]. Explosion And Shock Waves, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516
Citation: XIAO Dingjun, ZHU Zheming, PU Chuanjin, LU Lu, HU Rong. Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading[J]. Explosion And Shock Waves, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516

爆炸荷载下青砂岩动态起裂韧度的测试方法

doi: 10.11883/bzycj-2018-0516
基金项目: 国家自然科学基金(11702181,11802255);西南科技大学博士基金(19ZX7168)
详细信息
    作者简介:

    肖定军(1982- ),男,博士,讲师,xhemers@sina.com

    通讯作者:

    蒲传金(1979- ),男,硕士,副教授,puchuanjin@sina.com

  • 中图分类号: O389

Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading

  • 摘要: 为了研究爆炸荷载下青砂岩I型裂纹动态断裂韧度的测试方法,利用内部中心单裂纹圆盘(internal center single crack disc,ICSCD)试样进行了爆炸试验研究。试样由外径为400 mm、内部加载孔径为40 mm、预制裂纹长为60 mm的青砂岩制成。利用同步触发器实现圆盘中心起爆,并同步触发超动态应变仪,通过径向应变片获取爆炸应变曲线、裂纹尖端的环向应变片获取裂纹起裂时刻。以实测爆炸应变曲线为参量,应用Laplace变换推导出试样加载孔壁应力时程曲线表达式,并用数值反演法得出其数值解。利用ANSYS有限元软件,建立数值计算模型,通过相互作用积分法得出了在爆炸荷载作用下砂岩的I型动态应力强度因子曲线。研究结果表明:(1)ICSCD试件能够很好地用来测试岩石的动态起裂韧度;(2)炮孔周边的应力可以通过拉普拉斯变换的数值反演方法得到;(3)通过试验-数值法能稳定计算出ICSCD砂岩构型的动态起裂韧度,其最大误差仅为7%。
  • 图  1  实验数值方法流程图

    Figure  1.  Flow chart of experimental numerical method

    图  2  爆炸加载示意图

    Figure  2.  Sketch of specimen under explosive loading

    图  3  xz方向应变曲线对比

    Figure  3.  Contrast of strain curves for x and z directions

    图  4  试样构型

    Figure  4.  Sketch map of specimens

    图  5  应变测试系统示意图

    Figure  5.  Strain test system

    图  6  炮孔近区典型应变波形

    Figure  6.  Typical histories of strain near blast holes

    图  7  断裂信号与起裂时间确定

    Figure  7.  Fracture signal and initiation time

    图  8  爆破后试样形态

    Figure  8.  Specimen failure patterns after blasting

    图  9  反演与实测应变对比曲线

    Figure  9.  Contrast of strain curves for inversion and testing

    图  10  炮孔应力回推曲线

    Figure  10.  Histories of pressure on wall of borehole

    图  11  J积分的定义简图

    Figure  11.  Definition of the J integral

    图  12  有限元计算加载模型

    Figure  12.  Finite element calculation loading model

    图  13  应力强度因子时程曲线

    Figure  13.  Histories of the stress intensity factor

    表  1  电阻应变片尺寸及参数

    Table  1.   Parameters of strain gauge

    型号敏感栅尺寸基底尺寸电阻值/Ω灵敏度/%
    BA120-10AA9.8 mm×3.0 mm15.0 mm×5.0 mm120±0.22.21±1
    BA120-1AA1.0 mm×2.2 mm4.3 mm×3.5 mm120±0.22.21±1
    下载: 导出CSV

    表  2  应变测点位置与测试值

    Table  2.   Location of Strain gauge point and test value

    试样序号测点号$\overline r $应变时间/μs应变峰值/10−3
    起始时间峰值时间终止时间加载时间卸载时间
    1G41620.522.8 72.42.3 49.611.1
    G53238.640.3208.11.7167.8 4.8
    G65667.269.3133.83.3 64.5 2.5
    G73237.439.1201.11.7162.0 5.6
    2G41620.722 71.11.3 49.111.7
    G53238.940.6204.81.7164.2 5.4
    G65667.569.3132.41.8 63.1 3.0
    G73236.039.7204.93.7165.2 5.5
    3G41620.522.9 78.62.4 55.713.6
    G53238.540.3210.21.8169.9 4.6
    G65667.171.7137.54.6 65.8 2.8
    G73240.442.1205.61.7163.5 5.6
    4G41620.922.6 70.91.7 48.314.1
    G53238.741.5215.82.8174.3 5.3
    G65668.570.7148.32.2 77.6 2.9
    G73238.740.6215.81.9175.2 5.6
    下载: 导出CSV

    表  3  裂纹断裂时间

    Table  3.   Time of the crack fracture

    试样序号测点号$\overline r $应变时间/μs
    起始时间断裂时间断裂积累时间
    1G23238.079.941.9
    2G23237.584.446.9
    3G23239.586.447.0
    4G23238.778.840.1
    平均值3238.482.444.0
    下载: 导出CSV

    表  4  不同试样起裂韧度

    Table  4.   Fracture toughness of different specimens

    试样回推点起裂韧度/
    (MPa·m−1/2)
    平均值/
    (MPa·m−1/2)
    1G54.75.0
    G75.2
    2G55.15.5
    G75.9
    3G54.85.2
    G75.5
    4G54.84.8
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-12-26
  • 修回日期:  2019-05-10
  • 网络出版日期:  2019-11-25
  • 刊出日期:  2020-02-01

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