水泥乳化沥青砂浆统计损伤本构模型

Statistical Damage Constitutive Model of Cement and Asphalt Mortar

为研究水泥乳化沥青砂浆(CA砂浆)在不同应变率下的本构关系,采用统计损伤力学的方法,建立了CA砂浆的应变率效应统计损伤本构模型,并探讨了CA砂浆的损伤特性随应变率的变化规律.结果表明:本构模型的拟合结果与试验结果的相关系数均在0.978 1以上,且该模型能够有效体现CA砂浆的韧性随应变率增大向脆性的转化;应变率越大,CA砂浆峰值损伤率前的损伤率越小,峰值损伤率后的损伤率越大.

In order to investigate the constitutive relationship for cement and asphalt mortar （CA mortar） under different strain rates, a statistical damage constitutive model considering the strain rate effect of CA mortar was established by using the method of statistical damage mechanics. In addition, the variation of damage properties of CA mortar with strain rate was discussed. The research results show that correlation coefficients between fitting results based on the constitutive model and experimental ones are all above 0.978 1, and the constitutive model can effectively reflect the transformation of toughness to brittleness of CA mortar with the increase of strain rate. A great strain rate will result in a small damage after the peak damage rate rate of CA mortar before the peak damage rate and a big damage rate