摘要
针对工程实际中的管状和空间三维编织复合材料构件中力学性能存在梯度的情况,提出一种性能可以变化的六面体微单元几何模型来描述三维编织复合材料及其构件的几何特性。这种微单元的结构根据三维编织立体几何结构的不同而不同。找出微单元几何形状的变化规律和编织纱线在单元中的位置及体积百分数的变化趋势,为确定这些因素与微单元局部力学性能的关系提供了一种切实可行的分析模型。以轴线为直线的管状三维编织复合材料为例,建立了可变微单元几何模型,详细分析了各个参数之间的变化关系。这里等轴向编织花节矩形断面复合材料分析成为可变微单元分析方法的一种特殊情况,同时这种模型还可用于描述空间复杂形状多维编织复合材料的几何特性描述,有助于这类材料及构件的力学分析。
A sort of hexahedral microstructure unit-cell （MUC） geometric model is presented, whose performances are variable, aimed at resolving the troubles of the mechanical analysis about the gradient characteristics in the tubular and 3D braided composites components. The microstructure of MUC is diverse in multifarious 3D braided composites. Finding out the rules of the MUC geometric diversifications and the changed trends of its yarns volume fraction along with its coordinates, a feasible analysis model is provided for making certain the relationships among these factors and local mechanical performances in the MUC. A geometrical model was constituted for a kind of tubular 3D braided composites, of which the symmetrical axes are straight. The function relationships among the parameters were demonstrated in detail. The model about rectangular 3D braided composites preform is oversimplified. It might be used to describe the physical performances of spatial complicated and multi-dimensions braided composites and rebound to mechanical analysis for the composites.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第5期162-171,共10页
Acta Materiae Compositae Sinica
关键词
三维编织复合材料
可变微单元
几何分析模型
3D braided composites
variable microstructural unit-cell
geometrical analysis model
