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基于SHPB脉冲波形特征的类岩石材料动态响应

Dynamic Response of Rock-like Materials Based on SHPB Pulse Waveform Characteristics.

作者信息

Sun Bi, Chen Rui, Ping Yang, Zhu Zhende, Wu Nan, He Yanxin

机构信息

Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

Shenzhen Water Planning and Design Institute Co., Ltd., Shenzhen 518001, China.

出版信息

Materials (Basel). 2021 Dec 28;15(1):210. doi: 10.3390/ma15010210.

DOI:10.3390/ma15010210
PMID:35009356
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8746182/
Abstract

Rock-like brittle materials under dynamic load will show more complex dynamic mechanical properties than those under static load. The relationship between pulse waveform characteristics and strain rate effect and inertia effect is rarely discussed in the split-Hopkinson pressure bar (SHPB) numerical simulation research. In response to this problem, this paper discusses the effects of different pulse types and pulse waveforms on the incident waveform and dynamic response characteristics of specimens based on particle flow code (PFC). The research identifies a critical interval of rock dynamic strength, where the dynamic strength of the specimen is independent of the strain rate but increases with the amplitude of the incident stress wave. When the critical interval is exceeded, the dynamic strength is determined by the strain rate and strain rate gradient. The strain rate of the specimen is only related to the slope of the incident stress wave and is independent of its amplitude. It is also determined that the inertia effect cannot be eliminated in the SHPB. The slope of the velocity pulse waveform determines the strain rate of the specimen, the slope of the force pulse waveform determines the strain rate gradient of the specimen, and the upper bottom time determines the strain rate of the specimen. It provides a reference for SHPB numerical simulation. A dynamic strength prediction model of rock-like materials is then proposed, which considers the effects of strain rate and strain rate gradient.

摘要

动态载荷作用下的类岩石脆性材料会呈现出比静态载荷作用下更为复杂的动态力学性能。在分离式霍普金森压杆（SHPB）数值模拟研究中，脉冲波形特征与应变率效应和惯性效应之间的关系鲜有探讨。针对这一问题，本文基于颗粒流代码（PFC），讨论了不同脉冲类型和脉冲波形对试件入射波形及动态响应特性的影响。研究确定了岩石动态强度的一个临界区间，在此区间内，试件的动态强度与应变率无关，但随入射应力波幅值的增大而增大。当超过临界区间时，动态强度由应变率和应变率梯度决定。试件的应变率仅与入射应力波的斜率有关，与其幅值无关。研究还确定在SHPB中无法消除惯性效应。速度脉冲波形的斜率决定试件的应变率，力脉冲波形的斜率决定试件的应变率梯度，上下底时间决定试件的应变率。这为SHPB数值模拟提供了参考。随后提出了一种考虑应变率和应变率梯度影响的类岩石材料动态强度预测模型。

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