摘要
在34个RHT模型参数中,19个参数可以通过试验、理论研究等手段获得,但还剩15个参数较难确定.为了较为准确的获得相关参数,在只改变参数N、p_(comp)、f_t~*、f_s~*、A、n、Q_0、g_c~*、ξ、D_1、ε_p^m、A_f、n_f、B、g_t~*的情况下,利用LS-DYNA对石灰岩进行单轴、三轴压缩模拟计算,通过对比RHT模型的弹性、线性强化以及损伤软化段的曲线对以上15个参数的敏感性进行研究,并以红砂岩为例,利用SHPB冲击红砂岩获得应力-应变曲线,并通过静力学、声波测试等试验获得红砂岩相关物理参数,以LS-DYNA模拟SHPB冲击试验作为手段,通过正交试验的方法得到了红砂岩的RHT模型参数,为了验证所确定参数的正确性,将LS-DYNA模拟SHPB冲击红砂岩的曲线与SHPB冲击试验曲线进行了对比,取得了令人满意的效果.
Among the total 34parameters of RHT constitutive model,there are 19parameters can be confirmed from experiment or theoretical study,but the left ones,N、p（comp）、ft^＊、fs^＊、A、n、Q0、gc^＊、ξ、D1、εp-m、Af、nf、Band gt^＊,are generally hard to acquire.A sensitivity study of the 15hard-acquired parameters was conducted through numerical simulation of uniaxial and triaxial compression of limestone using LS-DYNA.And then a new method was proposed in this paper to acquire all 34parameters of RHT model in terms of red sandstone by orthogonal experiment coupled with static test,sonic wave test,SHPB impact test and LS-DYNA numerical simulation.The simulated result of red sandstone is in a well line with the result from SHPB impact test of red sandstone,which evidenced the RHT model of red sandstone is effective.
作者
李洪超
陈勇
刘殿书
黄永辉
赵磊
LI Hong-chao;CHEN Yong;LIU Dian-shu;HUANG Yong-Hui;ZHAO Lei(City College,Kunming University of Science and Technology,Kunming,Yunnan 650051,China;School of Mechanics ~ Civil Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China;Electrical Engineering College,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;Faculty of Science and Technology,Federation University Australia,University Drive,Mt Helen,Ballarat,Victoria 3353,Australia)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2018年第8期779-785,共7页
Transactions of Beijing Institute of Technology
基金
昆明理工大学引进人才科研启动基金资助项目(KKSY201756009)
