[1]余道兴,宗周红,李明鸿,等.基于不同材料模型的混凝土SHPB试验数值模拟[J].东南大学学报(自然科学版),2017,47(1):124-129.[doi:10.3969/j.issn.1001-0505.2017.01.022]
 Yu Daoxing,Zong Zhouhong,Li Minghong,et al.Numerical simulation of concrete SHPB test based on different material models[J].Journal of Southeast University (Natural Science Edition),2017,47(1):124-129.[doi:10.3969/j.issn.1001-0505.2017.01.022]
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基于不同材料模型的混凝土SHPB试验数值模拟()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
47
期数:
2017年第1期
页码:
124-129
栏目:
数学、物理学、力学
出版日期:
2017-01-18

文章信息/Info

Title:
Numerical simulation of concrete SHPB test based on different material models
作者:
余道兴宗周红李明鸿刘路院素静
东南大学土木工程学院, 南京 210096
Author(s):
Yu Daoxing Zong Zhouhong Li Minghong Liu Lu Yuan Sujing
School of Civil Engineering, Southeast University, Nanjing 210096, China
关键词:
K& C模型 HJC模型 CSC模型 SHPB试验 数值模拟
Keywords:
K& C(Karagozian and Case)model HJC(Holmquist-Johnson-Cook)model CSC(continuous surface cap)model SHPB(split Hopkinson pressure bar)test numerical simulation
分类号:
O347
DOI:
10.3969/j.issn.1001-0505.2017.01.022
摘要:
为了分析不同材料模型对混凝土分离式霍普金森压杆(SHPB)试验数值模拟结果的影响,在LS-DYNA软件中分别运用K& C,HJC,CSC三种材料模型对混凝土的SHPB试验进行模拟.利用脉冲整形器对入射波进行整形以减小弥散效应,实现恒应变率加载,并从SHPB试验的基本假定出发验证了有限元模型的准确性.通过数值模拟得到了不同撞击速度下基于3种材料模型的混凝土破坏过程及其应力-应变曲线.结果表明:K& C,HJC,CSC三种模型基本上能够反映混凝土的动态力学特性,且K& C模型和CSC模型的失效模式为核心塌陷,而HJC模型则表现出留核现象;在相同的平均应变率下,HJC模型和K& C模型的动力放大系数大于CSC模型;随着平均应变率的增加,峰值应变增大,CSC模型和HJC模型的割线刚度减小,而K& C模型的割线刚度变化不明显.
Abstract:
To analyze the influence of the different material models on the numerical simulation results of the concrete split Hopkinson pressure bar(SHPB)test, the concrete SHPB test is simulated by using the K& C(Karagozian and Case),HJC(Holmquist-Johnson-Cook)and CSC(continuous surface cap)models in the LS-DYNA software, respectively. The incident wave is shaped by the pulse shaping device to reduce the dispersion effect, and the constant strain rates of loading are realized. The accuracy of the finite element simulation is verified based on the basic assumption of the SHPB test. The failure process of concrete and the corresponding stress-strain curves at different impact velocities based on three different material models are obtained by numerical simulation. The results show that the K& C model, the HJC model and the CSC model can basically reflect the dynamic mechanical properties of concrete. The failure modes of the K& C model and the CSC model are core collapse, while the HJC model shows the kernel phenomenon. At the same average strain rate, the dynamic amplification factors of the HJC model and the K& C model are larger than that of the CSC model. With the increase of the average strain rate, the peak strain increases, and the secant stiffnesses of the CSC model and HJC model decrease, while the stiffness of the K& C model does not change obviously.

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备注/Memo

备注/Memo:
收稿日期: 2016-07-19.
作者简介: 余道兴(1991—),男,硕士生;宗周红(联系人),男,博士,教授,博士生导师,zongzh@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51678141)、江苏高校优势学科建设工程资助项目(CE02-2-20)、江苏省普通高校研究生科研创新计划资助项目(KYLX16_0259).
引用本文: 余道兴,宗周红,李明鸿,等.基于不同材料模型的混凝土SHPB试验数值模拟[J].东南大学学报(自然科学版),2017,47(1):124-129. DOI:10.3969/j.issn.1001-0505.2017.01.022.
更新日期/Last Update: 2017-01-20