三峡大学学报（自然科学版）2024，Vol.46Issue(3)：76-83,8.DOI:10.13393/j.cnki.issn.1672-948X.2024.03.012
具有初始损伤的混凝土动态轴拉力学性能仿真研究
Simulation Study on Dynamic Axial Tensile Properties of Concrete with Initial Damage
摘要
Abstract
Based on the Walavin formula and Monte Carlo method,a numerical model of random aggregate is developed by Matlab.On the basis of the damage and fracture theory,the cohesive force unit is embedded in the mortar interface,the interface between aggregate and mortar and the interface of aggregate through the Python programming language.The cohesive force model of secondary concrete is established to describe the whole process of crack initiation,propagation,evolution and penetration in concrete.Based on the established meso-model,concrete specimens with different porosity and microcrack densities are subjected to dynamic tensile loading at different strain rates,and the dynamic axial tensile properties of concrete are studied.The results show that there is an obvious nonlinear relationship between the peak axial tensile stress and the porosity,and the decline curve is a logarithmic trend.With the increase of porosity,the weakening degree of the peak axial tensile stress of concrete decreases.The dynamic tensile strength of concrete with initial porosity increases with the increase of strain rate.The peak stress of concrete with initial microcrack decreases with the increase of microcrack density and the dynamic axial tensile strength also has a rate effect.关键词
混凝土/细观分析/数值仿真/初始损伤/应变速率/力学性能Key words
concrete/micro analysis/numerical simulation/initial damage/strain rate/mechanical properties分类
土木建筑引用本文复制引用
褚超,王乾峰,彭刚,谢艳芳,袁清驰,杨嘉伟..具有初始损伤的混凝土动态轴拉力学性能仿真研究[J].三峡大学学报（自然科学版）,2024,46(3):76-83,8.基金项目
国家自然科学基金项目(51579139,51709155) （51579139,51709155）
