煤的动态力学本构模型

为揭示煤岩动态破坏机理，利用φ50mm的分离式霍普金森压杆（SHPB）实验系统，对煤试样进行不同应变速率下的冲击加载实验，实验结果表明：煤体动态本构曲线前期就呈现出很强的非线性，初始弹性模量、屈服强度和极限强度都随应变率的增大而增大，塑性变形则是先增大后减小。根据动态本构曲线特征以及前人对本构模型的研究成果，运用弹塑性理论，建立了损伤体一黏弹性本构模型，模型的拟合曲线与实测动态本构曲线具有较好的一致性，拟合结果表明，煤体的动态力学性质对高低应变率的敏感性不同，对高应变率比较敏感，尤其是在300s-1的应变率下，煤体的塑性流动最强，应力应变曲线产生了二类卸载（正斜率）。...

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Bibliographic Details
Published in煤炭学报 Vol. 38; no. 10; pp. 1769 - 1774
Main Author 付玉凯 解北京 王启飞
Format Journal Article
LanguageChinese
Published 2013
Subjects
动态力学性能
本构模型
煤岩体
霍普金森压杆
Online AccessGet full text
ISSN0253-9993

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Summary:为揭示煤岩动态破坏机理，利用φ50mm的分离式霍普金森压杆（SHPB）实验系统，对煤试样进行不同应变速率下的冲击加载实验，实验结果表明：煤体动态本构曲线前期就呈现出很强的非线性，初始弹性模量、屈服强度和极限强度都随应变率的增大而增大，塑性变形则是先增大后减小。根据动态本构曲线特征以及前人对本构模型的研究成果，运用弹塑性理论，建立了损伤体一黏弹性本构模型，模型的拟合曲线与实测动态本构曲线具有较好的一致性，拟合结果表明，煤体的动态力学性质对高低应变率的敏感性不同，对高应变率比较敏感，尤其是在300s-1的应变率下，煤体的塑性流动最强，应力应变曲线产生了二类卸载（正斜率）。
Bibliography:FU Yu-kai, XIE Bei-jing, WANG Qi-fei （ 1. Coal Mining ＆ Designing Department, Tiandi Science ＆ Technology Co. , Ltd. , Beijing 100013, China;2. School of Resources and Safety Engineering China University of Mining and Technology （ Beijing ） ,Beijing 100083 ,China）
Split Hopkinson Pressure Bar; dynamic mechanical properties;constitutive model;coal mass
11-2190/TD
In order to reveal the mechanism of coal mass dynamic ple was made by φ50 mm split Hopkinson pressure bar （SHPB） damage , the impacting compression test of coal sam- experimental system under different strain rate. The experimental results show that the preliminary dynamic constitutive curve shows great nonlinear and initial elastic mod- ulus, yield strength and ultimate strength increase with the strain rate increasing, but plastic deformation first increases and then decreases. According to the dynamic constitutive curve characteristics and previous constitutive model re- search, damage visco-elastic constitutive model was introduced by using elastic a
ISSN:0253-9993