爆炸聚能作用下混凝土试件劈裂的高速3D DIC实验

徐振洋; 杨军; 郭连军

doi:10.11883/1001-1455(2016)03-0400-07

爆炸聚能作用下混凝土试件劈裂的高速3D DIC实验

doi: 10.11883/1001-1455(2016)03-0400-07

1.
辽宁科技大学矿业工程学院, 辽宁鞍山 114051
2.
北京理工大学爆炸科学与技术国家重点实验室, 北京 100081

基金项目:

国家自然科学基金青年科学基金项目 51504129

详细信息

作者简介:
徐振洋(1982—), 男, 博士, 讲师, xuzhenyang10@foxmail.com

中图分类号: O385;TD235.1
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- 被引次数: 18
出版历程
- 收稿日期: 2014-10-24
- 修回日期: 2015-04-08
- 刊出日期: 2016-05-25

Study of the splitting crack propagation morphology using high-speed 3D DIC

1.
College of Mining Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为探寻非钻孔条件下露天爆破大块二次破碎形态的控制方法, 应用线性聚能射流对圆柱混凝土模型试件进行侵彻实验, 使用High-speed 3D DIC(高速三维数字图像相关方法)方法分析试件劈裂发展过程的全场三维形变特征。研究结果表明, 数据分析区内劈裂裂纹扩展速度在4个区间内呈阶梯式变化趋势, 峰值速度为235.52 m/s, 平均速度为140.89 m/s；线性聚能射流侵彻对劈裂裂纹扩展有明显导向作用, 应力集中作用使得劈裂裂纹围绕线性射流侵彻对称轴扩展, 扩展方向变化幅度较小；在劈裂裂纹扩展速度突变的3个时刻, 劈裂裂纹路径产生了3处明显拐点, 在拐点处伴随有支裂纹的产生, 支裂纹的扩展距离均未超过5 cm；主应变集中带形状及分布位置决定了裂纹扩展路径及趋势, 拉应变集中先于裂纹出现, 试件呈现准静态劈裂形态, 劈裂面平整度较高。
- 爆炸力学 /
- 裂纹 /
- 高速3D DIC /
- 混凝土 /
- 速度 /
- 应变
Abstract: To explore a method for control over the boulders splitting morphology, cylindrical concrete specimens were penetrated by a linear-shaped charge, the splitting cracks' propagation and development were photographed and the splitting development process of their 3D deformation characteristics were analyzed using high-speed 3D DIC. The results show that the velocity of the crack propagation within the data analysis region exhibits a tendency for a step-by-step increase. The peak velocity and the average velocity are respectively 235.52 m/s and 140.89 m/s. The impact of the linear shaped-charge jet plays a significant role in determining the splitting of the target so that the cracks of the target propagated symmetrically downward in an s-shape along the axis, and on its path the crack showed three obvious inflection points, where branch cracks were produced whose propagation distance was below 5 cm. The shape and location of the main strain concentration determines the crack propagation trend and path, and the tensile strain concentration occurs before the crack appears. The specimen exhibits a quasi-static splitting and the cracks have a fairly even distribution.
- mechanics of explosion /
- crack /
- High-speed DIC-3D /
- concrete /
- velocity /
- strain

HTML全文

图 1 实验照片

Figure 1. Pictures of the test

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图 2 测试系统及设备

Figure 2. Test systems and equipments

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图 3 标定及散斑图

Figure 3. Calibration and speckle

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图 4 数据三维重构

Figure 4. Three-dimensional reconstruction

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图 5 裂纹尖端观测点

Figure 5. Crack tip measuring points

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图 6 裂纹扩展速度曲线

Figure 6. Crack propagation velocities

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图 7 裂纹扩展动态图

Figure 7. Dynamic of crack propagation

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图 8 损伤破裂形貌

Figure 8. Damage rupture morphology

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图 9 最大主应变

Figure 9. Maximum principal strain field

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