摘要
针对3D打印混凝土自身的层面特征和各向异性的力学性能,目前尚缺少有效的数值模拟方法对3D打印混凝土进行力学性能分析的现状,基于变形条件和力学平衡条件,推导出了3D打印混凝土各向异性等效单元的线弹性本构模型,并基于剪应力互等定理给出了3D打印混凝土的层面应力计算方法。以100 mm×100 mm×100 mm的3D打印混凝土立方块体为研究对象,利用ANSYS有限元软件对3D打印混凝土立方块体进行了受力性能的数值模拟分析。结果显示:采用等效单元法得到的单元网格数量减少了64倍,位移结果的整体误差能够控制在1%以内,计算效率提高了430多倍。通过本文研究,采用等效单元法实现了具有层面特征的各向异性3D打印混凝土的有限元模拟分析,能够保证计算精度的前提下大幅度提高计算效率。
Due to the layer characteristics and anisotropic mechanical properties of 3D printed concrete,there is still lacking effective numerical simulation method for force analysis of 3D printed concrete.In this paper,the lin-ear elastic constitutive parameters of 3D printed concrete anisotropic equivalent elements are deduced,based on the deformation conditions and mechanical equilibrium conditions,and based on the shear stress reciprocity theo-rem,the layer stress calculation method of 3D printed concrete is given.A 100 mm×100 mm×100 mm 3D printed concrete cubic block is taken as an example.The ANSYS finite element software is carried out to simulate the force performance of 3D printed concrete.The results show that the number of elements obtained by the equivalent element method is reduced by 64 times,the overall error of the displacement results can be controlled within 1%,and the calculation efficiency is increased by more than 430 times.Through the research in this paper,the finite element simulation analysis of anisotropic 3D printed concrete with layer characteristics is realized,which can greatly improve the calculation efficiency under the premise of ensuring the calculation accuracy.
作者
刘晓蓬
韩小凯
周晶
薛冰寒
LIU Xiaopeng;HAN Xiaokai;ZHOU Jing;XUE Binghan(College of Water Conservancy and Civil Engineering,Shandong Agricultural University,Taian 271018,China;Shandong Transportation Planning and Design Institute Group Co.,Ltd.,Jinan 250101,China;Taishan Polytechnic,Tai’an 271000,China;College of Water Conservancy&Environment,Zhengzhou University,Zhengzhou 450001,China)
出处
《桂林理工大学学报》
CAS
北大核心
2024年第1期75-80,共6页
Journal of Guilin University of Technology
基金
国家自然科学基金面上项目(51878400)。
关键词
3D打印
混凝土
各向异性
层间弱面
力学性能
3D printing
concrete
anisotropy
weak interlayer
mechanical properties
