RHT模型的改进与数值拟合
PDF下载 (574)施德胜,施冠银,陈江瑛*.RHT模型的改进与数值拟合[J].宁波大学学报(理工版),2014,27(03):93-96.DOI:
SHI De-sheng,SHI Guan-yin,CHEN Jiang-ying*.Improvement and Numerical Fitting of RHT Model[J].Journal of Ningbo University(Natural Science & Engineering Edition),2014,27(03):93-96.DOI:
| Title: | Improvement and Numerical Fitting of RHT Model |
| 作者: | 施德胜, 施冠银, 陈江瑛* |
| Author(s): | SHI De-sheng, SHI Guan-yin, CHEN Jiang-ying* |
| 关键词: | RHT模型; 失效强度参数; 当前面表达式; 冲击动态 |
| Keywords: | SHPB; RHT constitutive model; parameter of the failure surface; expression of current face; dynamic impact |
| 分类号: | TU502+.6 |
| 文献标识码: | A |
| 摘要: | RHT模型普遍用于混凝土的数值模拟当中, 但该模型的相关参数较难获得. 利用SHPB实验测得C40混凝土应力应变曲线, 并从该曲线中选取RHT模型中弹性极限面和失效强度面对应的应力状态点进行数值拟合, 从而得到RHT模型参数A、N、δ、α. 并引进当前面所对应的归一化静水压参量和应变增量, 改进了损伤量D的描述, 从而改进了在混凝土数值计算中广泛应用的RHT模型. 结果表明: 改进RHT模型得到的理论应力应变曲线与实验曲线吻合良好, 可作为获得RHT模型参数的有效方法. |
| Abstract: | The RHT model is widely employed in the numerical simulation of concrete, but its associated parameters are hard to obtain. The stress-strain curves of C40 concrete are obtained by taking advantage of SHPB, and the special arguments of the stress-strain curves for the given material corresponding to the elastic limit surface and failure surface are used in numerical fitting, and finally the parameters of RHT model A, N, δ and α are obtained. The normalization pressure of the strength between failure surface and residual strength surface, as well as the increment of strain are introduced to improve the description of the damage D. Consequently, the RHT model is further improved. The theoretic stress-strain curves of improved RHT model are in good agreement with experimental ones. The proposed method proves to be an efficient way to obtain the parameters of RHT model |
| 参考文献 /References: | [1].computational constitutive model for concrete subjected to large strains, high strain rates, and high pressures[C]. Proceedings 14th International Symposium on Ballistics, Quebec, Canada, 1993:591-600. [2].Riedel W, Thoma K , Hiermaier S, et al. Penetration of reinforced concrete by BETA2B2500 numerical analysis using a new macroscopic concrete model for hydrocodes [C]. 9th International Symposium, Interaction of the Effects of Munitions with Structures, Berlin-Strausberg: IBMAC, 1999:315-322. [3].Hansson H, Skoglund P. Simulation of concrete penetration in 2D and 3D with the RHT material model[R]. Sweden: Tumba, Swedish Defence Research Agency, 2002. [4].姜华, 王君杰. 弹体垂直侵彻钢筋混凝土数值模拟[J]. 同济大学学报, 2010, 38(4):557-563. [5].Zhenguo Tu, Yong Lu. Evaluation of typical concrete material models used in hydrocodes for high dynamic response simulations[J]. International Journal of Impact Engineering, 2009, 36:132-146. [6].Tu Zhenguo, Lu Yong. Modifications of RHT material model for improved numerical simulation of dynamic response of concrete[J]. International Journal of Impact Engineering, 2010, 37(10):1072-1082. [7].张若棋, 丁育青, 汤文辉, 等. 混凝土HJC、RHT本构模型的失效强度参数[J]. 高压物理学报, 2011, 25(1): 15-21. [8].李世民, 李晓军. 几种常用混凝土动态损伤本构模型评述[J]. 混凝土, 2011, 260(6):19-22. |
| 备注/Memo: | 收稿日期: 2013?10?15. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（10972109, 11272165, 10802039）; 973计划项目（61392010202）; 宁波大学学科基金（ZJ1013）. 第一作者: 施德胜（1989－）, 男, 浙江温州人, 在读硕士研究生, 主要研究方向: 冲击动力学. E-mail: shidesheng89@163.com *通信作者: 陈江瑛（1964－）, 女, 浙江宁波人, 教授, 主要研究方向: 冲击动力学. E-mail: chenjiangying@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
