|
|
|
| Crack formation mechanism of concrete with an initial crack under hydraulic impacting |
| LIU Jialiang1,2,3,ZHANG Di2,DU Shujian2,WANG Haiyang2,3 |
1.Chongqing Key Laboratary of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China;
2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China；
3.National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China |
|
|
|
Abstract In order to explore the breaking mechanism of concrete with initial cracks under hydraulic impacting, a numerical model was established based on the smooth particle hydrodynamics (SPH), and the evolution process of concrete crushed in the crack area was quantitatively investigated by using the image processing technology.The results show that at the weak influence zone of an initial crack, the water hammer effect causes shear fracture in concrete on liquid-solid contact boundaries, resulting in a bowl-shaped crushing pit.At the strong influence zone of the initial crack, cracks nearby the upper tip of the initial crack are induced by combined effects of the compression-shear stress on liquid-solid contact boundaries and the stress concentration at the upper zone of the initial crack.Then synergistic actions of the water wedge and concrete wedge effects, combined with the stress concentration at the lower zone of the initial crack produce the cracks nearby the lower tip of the initial crack.Conical cracks are caused by the superimposed stress waves reflecting on free boundaries and on the initial crack.The degree of concrete crushing decreases along the water jet axis direction with different attenuation rate, indicating that the initial crack has significant blocking effect and strong interference action on the evolution of concrete crushing.
|
|
Received: 08 January 2019
Published: 15 July 2020
|
|
|
|
[1] MOMBER A W. A probabilistic model for the erosion of cement-based composites due to very high-speed hydro-abrasive flow [J]. Wear, 2016, 368-369: 39-44.
[2] 黄 飞，卢义玉，刘小川，等. 高压水射流冲击作用下横观各向同性岩石破碎机制[J]. 岩石力学与工程学报，2014, 33(7): 1329-1335.
HUANG Fei, LU Yi-yu, LIU Xiao-chuan, et al. Breakage mechanism of transverse isotropic rock subjected to high-pressure water jet [J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(7): 1329-1335.
[3] JIANG Hongxiang, DU Changlong, LIU Songyong, et al. Numerical simulation of rock fragmentation under the impact load of water jet [J]. Shock and Vibration, 2014, 2014(3): 118-124.
[4] JIANG Hongxiang, LIU Zenghui, GAO Kuidong. Numerical simulation on rock fragmentation by discontinuous water-jet using coupled SPH/FEA method [J]. Powder Technology, 2017, 312: 248-259.
[5] 司 鹄，薛永志. 基于SPH算法的脉冲射流破岩应力波效应数值分析[J]. 振动与冲击，2016, 35(5): 146-152.
SI Hu, XUE Yong-zhi. Numerical analysis for stress wave effects of rock broken under pulse jets [J]. Journal of Vibration and Shock, 2016, 35(5): 146-152.
[6] 强洪夫，范树佳，陈福振，等. 基于SPH方法的聚能射流侵彻混凝土靶板数值模拟[J]. 爆炸与冲击，2016, 36(04): 516-524.
QIANG Hong-fu, FAN Shu-jia, CHEN Fu-zhen, et al. Numerical simulation on penetration of concrete target by shaped charge jet with SPH method [J]. Explosion and Shock Waves, 2016, 36(04): 516-524.
[7] 葛庆子，翁大根，张瑞甫. 飞机撞击特大型LNG储罐全过程仿真分析[J]. 振动与冲击，2016, 35(04): 1-7+21.
GE Qingzi, WENG Dagen, ZHANG Ruifu. Whole process simulation analysis of aircraft's crashing into an extra-large LNG storage tank [J]. Journal of Vibration and Shock, 2016, 35(04): 1-7+21.
[8] BA K, GAKWAYA A. Thermomechanical total Lagrangian SPH formulation for solid mechanics in large deformation problems [J]. Computer Methods in Applied Mechanics and Engineering, 2018, 342: 458-473.
[9] RUSSELL M A, SOUTO-IGLESIAS A, ZOHDI T I. Numerical simulation of Laser Fusion Additive Manufacturing processes using the SPH method [J]. Computer Methods in Applied Mechanics and Engineering, 2018, 341: 163-187.
[10] 林晓东，卢义玉，汤积仁，等. 基于SPH-FEM耦合算法的磨料水射流破岩数值模拟[J]. 振动与冲击，2014, 33(18): 170-176.
LIN Xiao-dong, LU Yi-yu, TANG Ji-ren, et al. Numerical simulation of abrasive water jet breaking rock with SPH-FEM coupling algorithm. Journal of Vibration and Shock, 2014, 33(18): 170-176.
[11] HOLMQUIST T J, JOHNSON G R, COOK W H. A computational constitutive model for concrete subjective to large strain, high strain rates, and high pressure [C] //1th International Symposium on Ballistic, Quebec City, Canada, 1993, 591-600.
[12] Kong Xiangzhen, Fang Qin, Wu Hao, et al. Numerical predictions of cratering and scabbing in concrete slabs subjected to projectile impact using a modified version of HJC material model [J]. International Journal of Impact Engineering, 2016, 75:61-71.
[13] MALVAR L J, CRAWFORD J E, WESEVICH J W, et al. A plasticity concrete material model for DYNA3D [J]. International Journal of Impact Engineering, 1997, 19(9-10): 847-873.
[14] HEYMANN F J. High-speed impact between a liquid drop and a solid surface [J]. International Journal of Applied Physics, 1969, 40(13): 5112-5122.
[15] FIELD J E. Stress waves, deformation and fracture caused by liquid impact [J]. Philosophical Transactions for the Royal Society of London. Philosophical Transactions for the Royal Society of London, 1966, 260(1110): 86-93.
|
|
|
|
