摘要
采用离散化方法,基于等应变及等应力混合平均思想,结合桥联模型,建立了四步法小编织角三维四向矩形编织复合材料的拉伸强度模型。该模型不仅可以获得材料的等效弹性性能,而且能直接得到各组分材料(纤维束中纤维和基体、纤维束外基体)的细观应力分布,并基于纤维和基体失效准则,揭示了材料在单向拉伸载荷作用下的失效机理并预报了材料拉伸强度。数值分析结果与实验数据基本吻合,证明了该模型的有效性,经讨论材料主要工艺参数对拉伸强度和应力分布的影响,得到了一些有参考价值的结论。
A model to predict the uniaxial tensile strength of the 4 step 3D braided rectangular composite with low braiding angle is established. By the scheme of discretization, the iso-strain and iso stress mixed averaging assumptions are applied to analyze the elastic mechanical properties of the material. Coupled with the bridging model, the stress distribution in the fibers and matrix are obtained. Based on the failure criteria of the constituents of the material, failure mechanism of the materials under the tensile load is disclosed and the model predictes the tensile strength of the materials. At the meantime, the influence of the main technical parameters upon the tensile strength and stress distribution in the componenos are also discussed in detail, and some valuable conclusions are drawn based on the results reported herein. The predicted results of the model agree well with the experiment data, which indicates that the model to predict the tensile strength is efficient.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2007年第2期294-300,共7页
Acta Aeronautica et Astronautica Sinica
基金
江苏省研究生创新计划项目(2005065)
南京航空航天大学博士生创新与创优基金(4003-019017)
关键词
三维编织
复合材料
小编织角
拉伸强度
桥联模型
3D braided
composite
low braiding angle
tensile strength
bridging micromechanics model
