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该文针对高性能短纤维交错排布复合材料的刚度预测发展了三维“拉伸-剪切链”模型,并通过了有限元(FEM)计算验证,能够合理地预测短纤维交错排布复合材料的等效模量。验证结果显示,对于纤维长细比的变化、纤维体积含量的变化、纤维和基体间弹性模量比的变化,三维“拉伸-剪切链”模型都可以给出合理的预测,为短纤维交错排布复合材料的刚度设计提供了理论指导和参考依据。研究还显示,同样纤维体积含量和长细比下短纤维交错排布复合材料的等效模量远大于短纤维对齐排布的等效模量,说明了短纤维交错排布结构的优越性。
In this paper, a three-dimensional model of “tension-shear chain” has been developed for the stiffness prediction of staggered high-performance short fiber composites. The model has been verified by finite element analysis (FEM) The equivalent modulus of the composite. The verification results show that the three-dimensional “tensile-shear chain ” model can give a reasonable prediction for the variation of fiber slenderness ratio, fiber volume content, elastic modulus ratio between fiber and matrix, The design of the stiffness of staggered arrangement of short fibers provides theoretical guidance and reference. The study also shows that the equivalent modulus of staggered short fibers in the same fiber volume fraction and slenderness ratio is much larger than the equivalent modulus of aligned short staple fibers, indicating the superiority of staggered arrangement of short fibers.