玻璃钢夹砂管涵夹砂层细观断裂数值模拟  

Numerical Simulation of Mesoscopic Fracture of Sand Layer in GRPM Pipe Culvert

作　　者：王清洲 孙颖晖 薛晓 马士宾 肖成志 WANG Qingzhou;SUN Yinghui;XUE Xiao;MA Shibin;XIAO Chengzhi(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《材料导报》2024年第17期294-303,共10页Materials Reports

基　　金：天津市自然科学基金(20JCYBJC00630)。

摘　　要：为了提高玻璃钢夹砂管中夹砂层的力学性能,增强其可设计性,借助有限元仿真软件构建代表性体积单元重现树脂夹砂层的细观结构特性,通过全域插设零厚度粘聚单元,实现复杂离散的多裂缝萌生和扩展。对夹砂层试样单轴拉伸断裂过程进行模拟,分析细观断裂损伤演化过程,探究各组分参数对夹砂层断裂力学行为的影响规律。结果表明:构建的细观粘聚断裂模型能较好地表征夹砂层复杂断裂过程,轴向拉伸变形时复合材料主裂缝的形成位置近似垂直于加载方向,伴随界面脱粘和基体内裂纹的萌生与扩展。裂纹扩展方向主要受细观颗粒分布的位置影响,提高颗粒体积分数能显著提高材料刚度;多颗粒粒径分布的增强效果优于单粒径分布,粒径越小,则增强增韧效果越好;粘聚单元的抗拉强度和断裂能的增大均能够提升模型整体抗拉强度,断裂能越大,则裂纹路径分支越少。In order to improve the mechanical properties of the sand layer in the GRPM pipe and enhance its designability,a representative volume element model was constructed to reproduce its mesoscopic structure characteristics by means of finite element simulation software,and the zero-thickness cohesive element was inserted into the model to realize the complex and discrete multi-crack initiation and expansion of the model.The uniaxial tensile fracture process of the sand layer specimen was simulated,the microscopic fracture damage evolution processwas analyzed,and the influence of each component parameter on the fracture mechanical behavior of the sand layer was explored.The research results show that cohesive fracture model can better characterize the complex fracture process of sand layer.During axial tensile deformation,the main crack of the material is approximately perpendicular to the loading direction,accompanied by interfacial debonding and cracks propagation in the matrix.The crack propagation direction is mainly affected by the position of the particle distribution,increasing its volume fraction can improve the stiffness of the material.The enhancement effect of multi-particle size distribution is better than that of single particle size distribution,the smaller the particle size,the better the reinforcement and toughening effect.The increase of the tensile strength and fracture energy of the cohesive unit can improve the overall tensile strength of the model.The larger the crack path,the simpler the crack path.

关 键 词：颗粒增强复合材料 玻璃钢夹砂管 细观仿真 裂纹扩展 粘聚单元法 

分 类 号：TB332[一般工业技术—材料科学与工程]