3D打印混凝土界面力学行为及其对材料弹性常数影响的数值分析
Numerical Analysis of 3DPC Interface Machanical Performance and Its Influence on Material Elastic Constants
陈朝晖 1格茸汪堆 2王鹏飞 2张小月 1张志刚 1廖旻懋1
作者信息
- 1. 重庆大学土木工程学院,重庆 400045;山地城镇建设与新技术教育部重点试验室(重庆大学),重庆 400045
- 2. 重庆大学土木工程学院,重庆 400045
- 折叠
摘要
应用复合材料细观力学分析理论,提出了基于界面模型的3D打印混凝土(3DPC)各向异性数值模拟方法,定量揭示了层、条界面力学行为及其对3DPC各向异性弹性常数的影响规律.采用界面单元和连续体单元相结合,模拟界面滑移开裂行为与基体的力学性能,设计单轴压缩、劈拉、十字交叉拉伸和斜剪试验确定模型所需参数及相应取值范围.结果表明:界面拉伸和剪切张力-位移曲线均呈双线性特征,条间界面强度总体高于层间;界面剪切行为在两个剪切主方向上无显著差异;条间和层间弹性模量对整体弹性模量具有线性影响,对整体泊松比具有指数函数影响,条间和层间界面剪切模量对整体剪切模量具有综合影响.
Abstract
A numerical simulation method for anisotropy of 3 D printed concrete(3 DPC)based on interface model was proposed by applying micromechanics theory of composite materials.This method quantitatively revealed the mechanical behavior of layer/filament interface and its influence on anisotropic elastic constants of 3 DPC.By combining interface elements and continuum elements,the interface sliding-cracking behavior and mechanical properties of printed filament were simulated.Uniaxial compression,splitting tension,cross-bonded tension,and inclined shear tests were designed to determine the parameters and corresponding ranges required for model.The research shows that the interface tensile and shear traction-separation curves exhibit a bilinear characteristic,and the strength of filament interface is generally higher than that of layer interface.There is no significant difference in shear behavior in two shear principal directions.The elastic modulus between filament and layer has a linear impact on overall elastic modulus and has an exponential impact on Poisson's ratio.The shear modulus between filament and layer has a comprehensive impact on overall shear modulus.
关键词
3D打印混凝土/界面性能/各向异性弹性/本构关系/内聚力模型Key words
3D printed concrete/interface performance/anisotropic elasticity/constitutive model/cohesive zone model引用本文复制引用
基金项目
国家重点研发计划(十四五)(2021YFF0500804)
出版年
2024
国家科技期刊平台
NSTL
万方数据