混凝土材料动态本构参数的分阶段计算反求技术  

A multi-stage computational inverse technique for identification of the dynamic constitutive parameters of concrete

作　　者：陈睿[1,2] 刘杰[1,2] 韩旭[1,2] 毕仁贵[1,2] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《爆炸与冲击》2014年第3期315-321,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(11202076);中央高校基本科研业务费基金项目~~

摘　　要：基于不同应变率下的分离式Hopkinson压杆实验,提出了一种混凝土材料动态本构参数的分阶段反求方法。该分阶段反求方法中,结合不同的实验模型对未知参数进行敏感性分析,并依据敏感程度对参数进行分类,每类参数对应于1组实验,再利用反求方法分阶段确定各类参数,在每一类参数反求时均将上一次反求结果作为已知条件。结果表明,该分阶段反求方法充分利用所有实验的测量响应信息,能快速获取混凝土本构中较难确定的关键参数,为参数的确定提供了一种有效的途径。A multi-stage computational inverse technique is presented to determine the dynamic constitutive parameters of concrete based on the split Hopkinson pressure bar tests at different strain rate loadings. In this method, sensitivity analysis for parameters is carriect out based on different experimental models and classification for the parameters is performed according to sensitivity, then the parameters are determined step by step through the inverse method. During parameters identification by multi-stage inverse method, last identified results are applied to current parameters identification. The results indicate that this method obtains the parameters rapidly, which are determined difficultly and expensively by traditional method, combining with different experiments. It is a potentially effective and useful tool to identify material constitutive parameters.

关 键 词：固体力学 反问题 分阶段 参数确定 SHPB实验 HJC本构模型 

分 类 号：O347.3[理学—固体力学]