脆性材料水泥砂浆多轴应力下的动态响应分析  

Dynamic response of brittle material cement mortar under multi-axial stress

作　　者：李英华[1] 杨黎明[2] 汤立群[1] 刘逸平[1] 魏志强[1] 

机构地区：[1]华南理工大学土木与交通学院,广州510640 [2]宁波大学机械工程与力学学院,宁波315211

出　　处：《振动与冲击》2011年第10期216-220,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(10872070);广东省自然科学基金资助项目(05006591)

摘　　要：在实际的结构应用中,混凝土类材料一般处于复杂工作应力状态,且可能承受动态荷载的作用。据此,本文采用Instron3421液压伺服试验机和具有主动围压加压装置的SHPB研究了混凝土材料-砂浆宽应变率范围多轴应力下的动态力学行为;基于Johnson-Cook强度模型框架,确定了等效强度模型的率相关参数及其他材料常数;提出了适用于描述主动围压下砂浆受冲击荷载的损伤演化规律,并确定了损伤演化常数,实验数据与理论值吻合较好。Concrete materials used in structures generally work in state of complex stress and may bear dynamic loads.So,an instron servo-hydraulic testing system and a SHPB with a confining pressure device were used here to investigate the dynamic behavior of a concrete material-mortar under multi-axial stress in a wider range of strain rate.According to Johnson-Cook equivalent strength model,the strain rate coefficient and the related material constants of the mortar were determined experimentally.The damage evolution law of the mortar under SHPB impact with a confining pressure was presented and the damage evolution parameters were determined by experiments.The experimental data agreed well with the theoretical values.

关 键 词：水泥砂浆 SHPB 主动围压 等效强度模型 损伤演化 

分 类 号：TQ172.1[化学工程—水泥工业] O34[化学工程—硅酸盐工业]