单轴压缩下水泥砂浆本构关系的试验研究

为探讨水泥砂浆材料在不同应变率条件下的本构关系，进行了水泥砂浆单轴压缩试验，试验分析得出，砂浆材料是率相关的，砂浆的初始损伤的演化发生在应变值达到0.7～0.9倍应力峰值对应的应变值之后。据此，在标准线性固体模型的基础上，考虑损伤内变量的演化，建立了应变率相关的水泥砂浆的非线性黏弹性损伤模型。通过数值计算表明，试验数据和本文本构方程的吻合较好。

Experimental study on constitutive relation of cement mortar

The behaviors of cement mortar under uniaxial compression with various strain rates are studied experimentally. The result shows that the stressstrain relationship of cement mortar is depending on the strain rate. The evolution of initial damage takes place when the strain excesses a critical value. Thus, a nonlinear viscoelastic constitutive relation for cement mortar based on standard linear solid model considering the evolution of the damage internal variable is established accordingly. It is found that the experimental data are in good agreement with the theoretical curves.