摘要
利用SHPB实验系统及自行研制的混凝土类材料快速高温加热设备,对水泥砂浆试件进行了不同温度(20～600℃)和3种冲击速度下的实验,得到了不同温度和冲击速度下水泥砂浆试件的应力应变关系曲线。基于ZWT粘弹性本构模型,并且考虑高温下水泥砂浆损伤演化规律都服从Weibull分布,提出了一个水泥砂浆的热粘弹性率型损伤本构模型。通过数据拟合,获得了本构模型的相关参数,结果表明:理论预测和实验结果吻合良好。
Based on a 50-mm-diameter split Hopkinson pressure bar(SHPB) system and a self-developed concrete-like material rapid heating device,impact compressive experiments were carried out.The stress-strain curves at different temperature and three kinds of impact velocities were obtained.Based on the ZWT visco-elastic constitutive model and damage evolution of cement mortar following Weibull distribution,the damage thermo-viscoelastic constitutive equation at high strain rates was proposed.Through the numerical fitting,the parameters of the constitutive equation were obtained.Comparisons show that the model predictions agree well with the experiment results.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2011年第3期268-273,共6页
Explosion and Shock Waves
基金
国家自然科学基金项目(10602048
10972187)~~
关键词
固体力学
本构模型
SHPB
水泥砂浆
温度
损伤
粘弹性
solid mechanics
constitutive equation
SHPB
cement mortar
temperature
damage
viscoelastic
