氧化锌晶须应力传递机理的数值模拟研究  

Numerical Simulation of Stress Transfer Mechanism of ZnO Whiskers

作　　者：荣吉利[1] 王丹[1] 王玺[2] 项大林[1] 

机构地区：[1]北京理工大学宇航学院,北京100081 [2]北京航天发射技术研究所,北京100076

出　　处：《北京理工大学学报》2013年第5期450-453,共4页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(10672020)

摘　　要：基于剪滞法分析了四针状氧化锌晶须的应力传递机理,采用细观有限元模型对四针状氧化锌晶须/树脂基的特殊的应力传递机理和应力分布规律进行了计算和分析,结果显示由于氧化锌晶须的特殊结构,晶须针脚协同应力,能够更好地承担外部载荷,可增强复合材料的强度,使复合材料不易破坏失效.在此基础上,提出了对多随机变量的复杂形状的增强体的研究方法,开发了随机分布多变量晶须/树脂基复合材料生成程序,并结合有限元方法,对生成的晶须进行对比计算,得到了对晶须排列方式、长径比和载荷夹角等因素对复合材料的影响规律.Stress transfer mechanism of ZnO whiskers was analyzed based on shear lag method. A finite element model about tetra needle-shaped ZnO whiskers/resin matrix was built to calculate and analyze its special stress transfer mechanism and stress distribution. The results show that, because of its special structure, the whiskers stitch plays a stress synergistic role, which could support the external load better and reduce the average stress of the composites, so that the composite is not easy to destroy. Based on this, the generating program of random distribution multivariable whisker/polymer matrix composites has been developed. Through the finite element method, the influence of factors, such as arrangement pattern, aspect ratio of stitch and angle between load and stitch of whiskers, on composites could be calculated and analyzed.

关 键 词：氧化锌晶须 针脚 有限元 随机分布 数值模拟 

分 类 号：TB33[一般工业技术—材料科学与工程]