错位铺层拼接层合板承载机制的试验与模拟研究  

Experimental and FEM study on bearing mechanism of spliced ply with misalignment seams

作　　者：黄剑贤[1] 耿小亮[1] 张永久[1] 段苗苗[1] 岳珠峰[1] 甘建[2] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072 [2]成都飞机设计研究所,成都610041

出　　处：《应用力学学报》2013年第5期787-791,810,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11102163);西北工业大学基础研究基金(JC20110218)

摘　　要：针对具有特殊细观结构的非均匀连续复合材料——错位铺层拼接层合板,测定了其拉伸强度和刚度,并观测了其断口破坏特征和表面铺层的应变分布;基于细观结构,建立了包含基体损伤演化的三维有限元模型,并进行数值模拟分析,研究了材料的传力和破坏机理。结果表明:铺层间断使断点附近及相邻层受间断影响处形成了局部高应变梯度,断裂模式为基体剪切破坏;铺层间断点处的载荷通过基体承剪的方式传递,远离间断点处则仍靠纤维传载;随着断点间距(在3mm-9mm范围内变化)的增大,强度和刚度逐渐增加,但幅度不超过1.4%和3.3%。Spliced ply with misalignment seams is a kind of non-uniform continuous composite material with mesoscopic structure.The tensile experiment is taken to obtain its strength and stiffness,then failure characteristics and strain distribution of the first fiber are observed.The results show that near the discontinuity point and affected area by adjacent layer form local high strain gradient,and fracture mode is matrix shear failure.For studying the force transmission and failure mechanism of materials,based on experiment results and material mesoscopic structure which takes matrix damage as the main failure modes to simulate mechanics behavior,corresponding 3D finite element model is established.The simulation results show that load on breakpoint is carried by matrix and when it is away from breakpoint the load still relies on fiber.The growth of strength and stiffness do not exceed 1.4% and 3.3% when the breakpoint distance L changes in the range of 3-9mm.

关 键 词：错位铺层拼接 应变分布 间断点 基体剪切破坏 细观结构 

分 类 号：TB33[一般工业技术—材料科学与工程]