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.
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,δandαare obtained. The normalization pressure P＊ 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.
出处
《宁波大学学报（理工版）》
CAS
2014年第3期93-96,共4页
Journal of Ningbo University：Natural Science and Engineering Edition
基金
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)
关键词
RHT模型
失效强度参数
当前面表达式
SHPB
冲击动态
RHT constitutive model
parameter of the failure surface
expression of current face
SHPB
dynamic impact
作者简介
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
