FDEM simulation of dynamic failure mechanism of coal rock under impact

被引：0
|
作者：
Cheng S. [1 ]
Gao R. [1 ]
Zeng Y. [1 ]
Zhang J. [2 ]
Chen S. [3 ]
机构：
[1] School of Civil and Architectural Engineering, Wuhan University, Wuhan
[2] School of Sciences, Xi'an University of Science and Technology, Xi'an
[3] School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 19期
关键词：
cohesive forcemodel; finite-discrete element method (FDEM); impact failure; split Hopkinson pressure bar (SHPB); strain rate correlation;
D O I：
10.13465/j.cnki.jvs.2022.19.018
中图分类号：
学科分类号：
摘要：
Here, to study dynamic failure laws of coal rock, 50mm split Hopkinson pressure bar (SHPB) device was used to conduct coal rock impact failure tests. Based on the zero-thickness cohesive force element, the finite-discrete element (FDEM) model of coal rock was established, and its parameters were calibrated. Finally, SHPB impact testswere simulated on LS-DYNA software platform, the applicability of FDEM model in simulating dynamic failure was discussed, and the failure process of coal rock was analyzed. The results showedthat (1) the dynamic compressive strength and strain rate of coal rock meet the empirical relation, when strain ratesare 98.05s-l, 119.22s-l and 135.85s-l, the dynamic intensity factors (DIFs) are 1.92, 2.08 and 2.23, respectively; (2) under action of impact, the elastic deformation stage of coal rock is shorter, its plastic deformation ability is stronger, and the strain rate correlation of dynamic elastic modulus is not significant; (3) FDEM model can simulate brittle failure of rock type materials through failure of the zero-thickness cohesive force element, when the grid size is reasonable, due to existence of inertia effect, model parameters calibrated with quasi-static tests are also suitable for simulation of impact failure; (4) fragmentation degree of coal rock under impact is positively correlated to impact velocity, and its failure forms are local shear failure caused due to compression wave and overall tension failure caused due to Poisson effect. © 2022 Chinese Vibration Engineering Society. All rights reserved.
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页码：136 / 143
页数：7
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