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二维三轴编织复合材料的弹性性能分析
引用本文:严雪,许希武,张超.二维三轴编织复合材料的弹性性能分析[J].固体力学学报,2013,34(2):140-151.
作者姓名:严雪  许希武  张超
作者单位:南京航空航天大学
摘    要:提出了二维三轴编织复合材料的几何模型,模型考虑了纤维束的弯曲扭转状态及空间交错特性等几何元素。基于体积平均法,建立了预测二维三轴编织复合材料弹性性能的理论分析模型;通过引入更普遍适用的周期性位移边界条件,结合二维三轴编织复合材料的细观实体结构,建立了分析其力学性能的有限元模型。两种模型预测结果均与试验结果吻合,证明了方法的合理有效性。分析了材料受载下的细观应力分布,并讨论了编织参数对材料性能的影响。研究表明,二维三轴编织复合材料轴向性能得到了增强,应力分布更均匀,编织角以及纤维体积含量对材料弹性性能影响较大。

关 键 词:二维三轴编织  复合材料  理论分析模型  有限元模型  力学性能  2D  triaxial  braided    composites    analytical  model    finite  element  model    mechanical  properties  
收稿时间:2012-05-07

ANALYSIS OF ELASTIC PROPERTIES OF 2D TRIAXIAL BRAIDED COMPOSITES
Xue Yan , Xiwu Xu , Chao Zhang.ANALYSIS OF ELASTIC PROPERTIES OF 2D TRIAXIAL BRAIDED COMPOSITES[J].Acta Mechnica Solida Sinica,2013,34(2):140-151.
Authors:Xue Yan  Xiwu Xu  Chao Zhang
Abstract:A geometrical model was proposed for the 2D triaxial braided composites with the consideration of the undulation, the twist and the spatial interlacing of the yarns. Based on the volume-averaged method, an analytical model was developed for the prediction of engineering constants of 2D triaxial braided composites. Furthermore, a finite element model was established for the analysis of the mechanical properties by introducing an improved periodical boundary condition and the mesoscopic entity structure of 2D triaxial braided composites. The predication results of both models show good agreements with experimental results. The mesoscopic stress distribution of the material under loads was investigated and the influences of braiding parameters on the elastic constants were discussed. It shows that axial mechanical property is reinforced and the stresses are well-distributed; braid angle and fiber volume fraction have great influence on material’s elastic properties.
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