纤维增强型泥浆泵活塞开裂行为的细观尺度分析  

Microscale Analysis of Piston Cracking Behavior of Fiber-reinforced Mud Pump

作　　者：荣明达 田宏杰 米陇峰 李晴 Rong Mingda;Tian Hongjie;Mi Longfeng;Li Qing(CCTEG Xi'an Research Institute(Group)Co.,Ltd.,Xi'an 710077,China)

机构地区：[1]中煤科工西安研究院(集团)有限公司,西安710077

出　　处：《煤矿机械》2024年第1期61-64,共4页Coal Mine Machinery

基　　金：陕西省自然科学基础研究计划面上项目(2023JC-YB-403);天地科技股份有限公司科技创新创业资金专项项目(2021-TD-MS007)。

摘　　要：针对泥浆泵活塞的复合材料特征,考虑纤维增强体与橡胶基体之间粘结界面对宏观力学的影响,采用ABAQUS-Python二次开发的方法,生成了包含随机分布的纤维增强体的泥浆泵活塞模型;基于内聚力模型,建立了包含纤维增强体、异相材料界面相、橡胶基体和同相材料界面相的复合材料细观力学模型;以受轴向拉伸的泥浆泵活塞截面为研究对象,采用内聚力模型对界面的力学行为进行描述,通过试验对比,明确了界面性质对轴向拉伸性能的影响。结果表明,纤维对基体的增强效果随界面强度的提高而增强;增强体体积分数越大,应力集中程度更高,界面开始发生脱粘的应变越小,越容易发生开裂。According to the composite material characteristics of mud pump piston,considering the influence of bonding interface between fiber reinforcement and rubber matrix on macroscopic mechanics,piston model of mud pump containing randomly distributed fiber reinforcement was generated by ABAQUS-Python secondary development method.Based on the cohesive force model,a micromechanics model of composite material including fiber reinforcement,interphase of heterogeneous material,rubber matrix and interphase of homogenous material was established.Taking the piston section of the mud pump under axial tension as the research object,the cohesive force model was used to describe the mechanical behavior of the interface,and the influence of interface properties on axial tensile performance was clarified through experimental comparision.The results show that the strengthening effect of fiber on matrix increases with the increase of interfacial strength,and the larger the volume fraction of reinforcement,the higher the degree of stress concentration,the smaller the strain of interfacial debonding,and the more likely it is to crack.

关 键 词：纤维增强 细观力学 内聚力模型 

分 类 号：TH137.5[机械工程—机械制造及自动化]