EPS混凝土动态力学性能研究  

Dynamic mechanical behavior of EPS concrete

作　　者：胡俊[1,2] 巫绪涛[3] 胡时胜[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,合肥230027 [2]安徽建筑工业学院土木工程学院,合肥230601 [3]合肥工业大学土木工程学院,合肥230009

出　　处：《振动与冲击》2011年第7期205-209,共5页Journal of Vibration and Shock

基　　金：安徽高校省级自然科学研究重点项目资助;(KJ2010A270)

摘　　要：借助霍普金森杆(SHPB)对不同粒径、不同含量的EPS混凝土的动态性能进行了研究。EPS混凝土具有明显的率效应;EPS混凝土在低应变率下表现出明显的三个不同的阶段:弹性区、平台区和致密区,随应变率的增加,这一特性逐渐消失;对于同样体积含量、粒径小的EPS混凝土表现出来的平台区更明显,在此分析了产生这种现象的物理机制;在高体积含量的EPS混凝土中,粒子尺寸效应逐渐消失;随应变率的增加,峰值应力后留有长长的"尾巴",主要是由于EPS颗粒的粘弹性特性。A split Hopkinson pressure bar（SHPB） was employed to study the dynamic characterteristics of EPS concrete with different sizes and EPS beads.The results showed that the characterteristics of EPS concrete are sensitive to strain rate under the loading conditions in this study;the stress-strain relationship of EPS concrete reveals three different regions： linear-elasticity deformation due to bending of cell walls;the plateau stress as result of plastic buckling of cell walls and plastic collapse of cells,and this behavior is gradually vanished as strain rates increased;the plasic characterteristics of EPS concrete with smaller bead size and the same EPS volume are more evident;the physical mechanism is analyzed for this phenomenon;the particle size effect becomes negligible for concrete with very high EPS volume;the post peak-stress behavior of EPS concrete is very evident with increase in strain-rate due to EPS particle viscoelatic behavior.

关 键 词：EPS混凝土 SHPB 应变率 准微观脆性指数 

分 类 号：O347.3[理学—固体力学] P314.5[理学—力学]