作　　者： ; ; ;

机构地区： 南京航空航天大学材料科学与技术学院

出　　处： 《材料科学与工程学报》 2007年第5期657-661,666,共6页

摘　　要： 在已有研究的基础上,提出了一个新的2.5维编织复合材料有限元模型,该模型较为真实地模拟了织物内纤维束的轮廓结构和走向,可用于2.5维编织复合材料力学性能的有限元数值分析。利用该模型采用有限元法对2.5维编织复合材料进行了有效弹性性能的数值预报,并合理确定了复合材料内部应力场分布;同时提出经向纤维束横截面宽厚比是影响2.5维编织复合材料有效弹性性能的主要因素,分析了其影响情况。采用VARTM工艺制备了试验件,并对其进行力学性能测试。通过实验值和理论值的对比,结果表明:有限元计算得到的结果与实验值吻合较好,从而验证了该模型的有效性。 On the basis of previous studies,a new finite element model of 2.5 D braided composites is proposed,which truly simulates the profile and tending towards of bundles in fabric.It can be used to analyze the mechanical properties of 2.5 D braided composites and determine its stress field reasonably using the finite element method.The mostly factor that affects the effective elastic properties of 2.5 D braided composites is put forward,and the variation relationship of the effective elastic properties and the space ratio of section of the longitudinal bundle is studied.To validate this model,qualified experimental samples were made by VARTM technique;tensile tests were performed to determine the mechanical properties.The results show that the conclusions of finite element method(FEM) fit well with the experimental values;this model can be used to predict the macro modulus of 2.5 D braided composites effectively.

关 键 词： 编织复合材料 弹性性能 有限元模型

领　　域： [一般工业技术]