Modeling of Internal Geometric Variability and Statistical Property Prediction of Braided Composites

被引:6
|
作者
Li, Wenli [1 ]
Zhu, Donghui [1 ]
Shao, Wenqi [1 ]
Jiang, Dong [1 ]
机构
[1] Nanjing Forestry Univ, Sch Mech & Elect Engn, Nanjing 210037, Peoples R China
基金
中国国家自然科学基金;
关键词
braided composite; equivalent elastic parameter; thermal expansion coefficient; uncertainty modeling; Monte-Carlo simulation; ELASTIC PROPERTIES; TENSILE BEHAVIOR; ELEMENT; UNCERTAINTY; CONSTRUCTION; PARAMETERS; EXPANSION;
D O I
10.3390/ma15155332
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Due to the advantages of high specific strength, specific stiffness, and excellent fatigue resistance, carbon fiber reinforced braided composites have been widely applied in engineering. Since the molding process of braided composites is complex and immature, substantial variability of the internal geometry exists in composites, in which the yarn path with uncertainty is a main factor, so it is necessary to establish an uncertainty model to study the influence of randomness of the yarn path on mechanical properties, which is significantly related to the fatigue resistance properties of composite. An uncertain mesoscopic model with uniform distribution of yarn paths is proposed. Assuming the yarn path is spatially varying in interval range, the variability of yarn path is represented geometrically in the unit cell of composite. The three-dimensional coordinates of the yarn trajectory are calculated, the meso-uncertainty models of 2-D and 2.5-D braided composites are established. The equivalent elastic parameters and the thermal expansion coefficients are obtained by applying homogenization method and temperature field boundary conditions to the mesoscopic model. The effect of yarn path uncertainty on the statistical characteristics of elastic and thermal parameters of braided composites was studied by using Monte-Carlo simulation. A simulation method for modeling yarn path uncertainty of braided composites is provided in this paper for predicting the statistical characteristics of the equivalent elastic and thermal parameters.
引用
收藏
页数:18
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