胶凝砂砾石材料的细观滞回模型

Mesoscopic Hysteretic Model of Cemented Sand and Gravel Material

关键词:  胶凝砂砾石材料  滞回曲线  细观滞回模型  疲劳寿命

Key words:  cemented sand and gravel material  hysteretic curve  mesoscopic hysteretic model  fatigue life

摘要:

为充分认识胶凝砂砾石（CSG）材料的动力学特性,更好地揭示其动态本构关系,基于经典Preisach Mayergoyz（PM）细观滞回模型,结合CSG材料的非线性滞后特性,计入塑性残余应变和循环次数的影响,建立了CSG材料的细观滞回模型.将改进后的模型与试验滞回曲线进行对比分析后可知,该模型不仅可以反映CSG材料在循环荷载下的非线性滞后特征,还可以预测循环荷载下CSG材料的疲劳寿命.

Abstract:

In order to fully understand the dynamic characteristics of cemented sand and gravel(CSG) material and reveal its dynamic constitutive relationship better, based on the classical Preisach Mayergoyz(PM) mesoscopic hysteretic model, combined with the nonlinear hysteresis characteristic of CSG material, considering the influence of plastic residual strain and cycle number, the elastic plastic mesoscopic hysteretic model of CSG material was obtained. By comparing the hysteretic curve of the improved mesoscopic model with the test curve, it can be seen that this model can reflect the hysteretic characteristics of the CSG material, and the fatigue life of CSG material under cyclic load can be predicted by the model.