裂纹面动摩擦作用对脆性材料动力破坏的影响

夏晨; 戚承志; 利学; 周卓群

doi:10.6052/j.issn.1000-4750.2021.07.0552

裂纹面动摩擦作用对脆性材料动力破坏的影响

doi: 10.6052/j.issn.1000-4750.2021.07.0552

夏晨^{1, 2, 3,},
戚承志^{1, 2, 3, ,},
利学^1,,
周卓群^1,

1.
北京建筑大学土木与交通工程学院，北京100044
2.
北京未来城市设计高精尖创新中心，北京100044
3.
城市交通基础设施建设北京国际科技合作基地，北京100044

基金项目: 国家自然科学基金项目(51708018，51774018)；北京市教委科研项目-科技计划一般项目(KM202010016016)；北京建筑大学“建大英才计划”项目(JDYC20200308)

详细信息

作者简介:
夏　晨(1989−)，男，湖北人，副教授，博士，主要从事震源物理以及地下结构抗震研究(E-mail: xiachen@bucea.edu.cn)

利　学(1999−)，男(蒙古族)，内蒙人，硕士生，主要从事震源物理研究(E-mail: 2108590020132@stu.bucea.edu.cn)

周卓群(1998−)，男，山东人，硕士生，主要从事地下结构抗震研究(E-mail: 2108590020119@stu.bucea.edu.cn)

通讯作者:
戚承志(1965−)，男，山东人，教授，博士，主要从事断裂力学和岩石力学相关研究(E-mail: qichengzhi@bucea.edu.cn)

中图分类号: TU452
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- HTML全文浏览量: 52
- PDF下载量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-19
- 录用日期: 2021-11-16
- 修回日期: 2021-10-28
- 网络出版日期: 2021-11-16
- 刊出日期: 2022-12-01

EFFECT OF DYNAMIC FRICTION ON CRACK SURFACE ON DYNAMIC FAILURE OF BRITTLE MATERIALS

XIA Chen^{1, 2, 3
,},
QI Cheng-zhi^{1, 2, 3
, ,},
LI Xue^1
,,
ZHOU Zhuo-qun^1
,

1.
School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2.
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
3.
Beijing International Scientific and Technological Cooperation Base of Construction of urban Traffic Infrastructure, Beijing 100044, China

摘要

摘要: 基于岩石类材料的I型裂纹模型，提出了一种考虑裂纹密度、裂纹相互作用以及裂纹面动摩擦作用的脆性材料动力模型。以正方形阵列分布的裂纹为例，定量分析了不同裂纹密度及不同摩擦行为对试件的裂纹扩展过程、试件受力和破坏的影响。数值计算结果表明：随着裂纹密度增大，裂纹间的相互作用增强，试件破坏时的加载应力降低，惯性效应引起试件轴向附加应力增大。裂纹面的滑动会降低裂纹面的动摩擦系数，促进裂纹发展，并降低试件的强度。相对于常数摩擦系数，考虑速度及状态依赖型摩擦模型对裂纹面的滑动过程更为合理。动强度因子对比结果显示出试件明显的应变率效应和尺寸效应。
- 翼型裂纹模型 /
- 裂纹相互作用 /
- 裂纹密度 /
- 动摩擦 /
- 动强度因子
Abstract: Based on the model of Mode I cracks for rock-like material, a dynamic model for rock-like materials is proposed, which considers the crack concentration, density effect and dynamic friction of cracks. Taking the crack distributed in the square array as an example, the effects of different crack density and friction behavior on the crack propagation process, stress and failure of the specimen are quantitatively analyzed. The numerical results show that: with the increase of crack density, the interaction between cracks increases, the loading stress decreases, and the inertia effect causes the axial additional stress of the specimen to increase. The sliding of the crack surface will reduce the dynamic friction coefficient of the crack surface, promote the crack development, and reduce the strength of the specimen. Compared with the constant friction coefficient, considering the velocity and state-dependent friction model is more reasonable for the sliding process of the cracked surface. The comparison results of dynamic strength factors show that the specimen display an obvious strain rate effect and a dynamic size effect of rock mass strength.
- wing crack model /
- interaction of crack /
- crack density /
- dynamic friction /
- dynamic increase factors.

HTML全文

图 1 圆柱体试件坐标示意图

Figure 1. Diagram of coordinate axes for cylindrical sample.

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图 2 I型裂纹受力状态及单个I型裂纹示意图^[27]

Figure 2. Stress condition for mode I crack and diagram of one isolated crack^[27]

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图 3 不同岩石材料摩擦系数与滑移速度相关性^[32-33]

Figure 3. Dependence of friction coefficient on slip velocity^[32-33]

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图 4 I型裂纹初始裂纹面滑移时的受力状态^[35]

Figure 4. Slip over pre-existing crack as a driving mechanism for wing crack growth^[35]

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图 5 I型裂纹张开时的相互作用效应^[35]

Figure 5. Effect of crack interaction on wing crack opening^[35]

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图 6 轴向应变随时间的变化

Figure 6. Axial strain vs time

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图 7 轴向应变率随着时间的变化

Figure 7. Axial strain rate of the specimen vs time

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图 8 轴向应变加速度随时间的变化

Figure 8. Variation of axial strain acceleration of the specimen with time

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图 9 正方形分布裂纹阵列示意图^[31]

Figure 9. Periodic square configuration cracks^[31]

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图 10 裂纹密度参数为0.9时的裂纹面滑移速度

Figure 10. Slip velocity vs time for 'S-0.9' cracks

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图 11 不同裂纹密度条件下轴向应力随加载时间变化

Figure 11. Axial stress vs time for different crack concentration

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图 12 不同裂纹密度条件下惯性引起附加轴向应力随加载时间变化

Figure 12. Inertia induced additional axial stress vs time for different crack density

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图 13 不同尺寸试样的动强度因子对比

Figure 13. DIFs of concrete-like materials obtained from this study and SHPB specimens with different diameters

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图 14 不同摩擦系数条件下轴向应力随加载时间变化

Figure 14. Axial stress vs time for different constant friction coefficients for the model of wing crack interaction

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表 1 数值计算采用的参数

Table 1. List of the parameters for the numerical calculations

参数	数值
试件原始半径/mm	37
试件原始高度/mm	42
裂纹初始长度/mm	3
弹性模量E/GPa	17.2
单轴抗压强度/MPa	45
泊松比	0.19
密度/(kg/m)	2179
K_I0/(MPa·m^1/2)	0.56
${c_{\text{R}}}$/(m/s)	1656
${c_{\rm{P}}}$/(m/s)	2944
${v_{\text{m}}}$/(m/s)	800

下载: 导出CSV

表 2 不同裂纹密度条件下启裂和破坏时刻以及相应的加载应力

Table 2. The moments of crack growth initiation, sample failure and corresponding loading stresses for different crack density

裂纹密度	裂纹相互作用系数	启裂时刻/ (×10⁻⁶ s)	启裂时加载应力/MPa	破坏时刻/ (×10⁻⁶ s)	破坏时加载应力/MPa
0.15	1.0008	64	3.46	124	199.18
0.30	1.0049	63	3.19	113	122.46
0.50	1.0254	62	3.19	99	50.62
0.70	1.0896	62	3.19	92	30.22
0.80	1.1595	61	2.93	88	22.21
0.90	1.2929	60	2.49	91	28.01
0.95	1.4218	59	2.29	88	22.21

下载: 导出CSV

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