PVA-ECC单轴拉伸本构关系研究

Study on the Uniaxial Tensile Constitutive Relationship for PVA-ECC

根据同一材料配合比PVA-ECC单轴拉伸和单轴压缩试验结果,首先研究了PVA-ECC单轴拉伸强度(f_(tp))与单轴压缩强度(f_(cu70.7)),峰值拉应变和峰值拉应力之间的关系。接着,根据试验分析结果提出PVA-ECC单轴拉伸本构关系,并根据Sidoroff能量等价原理推导PVA-ECC的拉伸损伤计算表达式。最后,通过对比四点弯曲构件的模拟与试验结果,验证了本文提议方法的有效性。

Based on the uniaxial tensile and uniaxial compression test results of PVA-ECC with the same mixing ratio,the relationships between the uniaxial tensile strength(f tp)and compressive strength(f cu70.7),peak tensile strain and peak tensile stress of PVA-ECC were investigated.Subsequently,a constitutive relationship for the PVA-ECC under uniaxial tensile stress was proposed based on the results of the experimental analysis.The expressions for calculating the uniaxial tensile damage of PVA-ECC were derived using the Sidoroff energy equivalence principle.Finally,the validity of the proposed constitutive relationship was verified through a comparison of the four-point bending numerical simulation with the experimental results.