花岗岩粗糙表面动摩擦形态演化

张磊; 王文帅; 苗春贺; 单俊芳; 王鹏飞; 徐松林

doi:10.11858/gywlxb.20200640

花岗岩粗糙表面动摩擦形态演化

doi: 10.11858/gywlxb.20200640

张磊^1,,
王文帅¹,
苗春贺¹,
单俊芳¹,
王鹏飞¹,
徐松林^{1, 2,*, ,}

1.
中国科学技术大学中国科学院材料力学行为和设计重点实验室，安徽合肥　230027
2.
中国地震局地震预测研究所高压物理与地震科技联合实验室，北京　100036

基金项目: 高压物理与地震科技联合实验室开放基金（2019HPPES01）；国家自然科学基金（11672286，11872361）；中石油与中科院重大战略合作项目（2015A-4812）

详细信息

作者简介:
张　磊（1991－），男，博士研究生，主要从事材料动态力学性能研究. E-mail：zl21@ustc.edu.cn

通讯作者:
徐松林（1971－），男，博士，研究员，博士生导师，主要从事冲击下材料的动态响应研究. E-mail：slxu99@ustc.edu.cn

中图分类号: O341
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出版历程
- 收稿日期: 2020-11-18
- 修回日期: 2020-12-16

Rough Surface Morphology of Granite Subjected to Dynamic Friction

1.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
The United Laboratory of High-Pressure Physics and Earthquake Science, CEA Key Laboratory of Earthquake Prediction (Institute of Earthquake Science), China Earthquake Administration, Beijing 100036, China

摘要

摘要: 冲击过程中岩石界面动摩擦特性对于地震滑移等现象的研究有重要意义。基于分离式霍普金森压杆（SHPB）杆束技术对含倾斜界面的花岗岩进行冲击实验，分别采用光学显微镜和台阶仪，观测较大视场（毫米尺度）和较小视场（亚毫米尺度）下花岗岩界面粗糙形态。结果表明：微动滑移条件下，表面仍非常粗糙，没有大的凸起，但是对于局部初始较平滑的表面，冲击后由于表面的摩擦作用变得粗糙，很难观察到大位移滑移时的光滑滑移面。采用斜条型有限子群表示，结合微界面相对滑移磨损扩散的控制方程，建立岩石界面粗糙形态动力学演化的描述方法。初步结果验证了此方法的可行性，但需要结合深入的实验观测进行完善。研究结果对界面动摩擦演化过程及其机制的认识具有良好的参考意义。
- 动摩擦 /
- 粗糙表面 /
- 分离式霍普金森压杆 /
- 有限群表示
Abstract: Dynamic friction characteristics of rock surface during impact are of great significance to investigations of seismic slip and other phenomena. Series of experiments on rock samples with inclined joint were conducted by the split Hopkinson pressure bar (SHPB) bundles device. Changes of surface roughness of granite were observed by optical microscope for large field of view (i.e., millimeter scale) and step instrument for small field of view (i.e., submillimeter scale). Under the condition of micro slip, the surface was still very rough, but there was no larger bulge; however, the local initially smooth surface became rough due to the friction effect of the surface. Thus it was difficult to observe the smooth sliding surface that appears during large displacement slip. Based on the governing equation of sliding friction and diffusion of micro surface, the description method of dynamic evolution of surface rough morphology was established by using inclined strip finite subgroup representation. The preliminary results show that this method was feasible, but it needs to be improved with more profound experimental observation. The results have a good reference significance for the understanding of the evolution process and mechanism of dynamic friction.
- dynamic friction /
- rough surface /
- split Hopkinson pressure bar /
- finite group representation

HTML全文

图 1 三维粗糙表面形态^[15]

Figure 1. 3D plot of the surface^[15]

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图 2 SHPB杆束实验装置

Figure 2. SHPB bundle bars device

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图 3 微动摩擦性能

Figure 3. Properties of microscale dynamic friction

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图 4 微动摩擦过程中20°界面x方向的位移场演化

Figure 4. Evolution of x-displacement field of 20° surface during microscale dynamic friction

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图 5 30°界面在光学显微镜下的表面形态

Figure 5. Surface morphology of 30° joint by microscope

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图 6 30°界面在光学显微镜下的局部摩擦形态

Figure 6. Local sliding morphology of 30° joint by microscope

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图 7 15°界面在台阶仪下的局部表面形态

Figure 7. Local surface morphology of 15° joint by stylus profiler

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图 8 30°界面在台阶仪下的局部表面形态

Figure 8. Local surface morphology of 30° joint by stylus profiler

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图 9 斜条型子群(a)与雁型排列子群(b)^[21]

Figure 9. Oblique strip pattern (a) and echelon pattern (b)^[21]

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图 10 应用斜条型子群拟合30°界面

Figure 10. Simulation surface of 30° joint by oblique strip pattern

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图 11 动摩擦过程界面形态演化

Figure 11. Simulated evolution of surface morphology during dynamic friction

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