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首页> 外文期刊>Applied composite materials >Bearing Abilities and Progressive Damage Analysis of Three Dimensional Four-Directional Braided Composites with Cut-Edge
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Bearing Abilities and Progressive Damage Analysis of Three Dimensional Four-Directional Braided Composites with Cut-Edge

机译：切边三维四向编织复合材料的承载能力和渐进损伤分析

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摘要

Cut-edge is a kind of damage for the three-dimensional four-directional (3D4d) braided composites which is inevitable because of machining to meet requisite shape and working in the abominable environment. The longitudinal tensile experiment of the 3D4d braided composites with different braiding angles between cut-edge and the ones without cut-edge was conducted. Then representative volume cell (RVC) with interface zones was established to analyze the tensile properties through the fracture and damage mechanics. The periodic boundary conditions under the cut-edge and uncut-edge conditions were imposed to simulate the failure mechanism. Stress-strain distribution and the damage evolution nephogram in cut-edge condition were conducted. Numerical results were coincident with the experimental results. Finally the variation of cut-edge effect with the specimen thickness was simulated by superimposing inner cells. The consequence showed that thickness increase can effectively reduce cut-edge influence on longitudinal strength for 3D4d braided composites. Cut-edge simulation of braided composites has guiding significance on the actual engineering application.
机译：尖端是对三维四向（3D4d）编织复合材料的一种损坏，这是不可避免的，因为需要加工才能满足所需的形状并在恶劣的环境中工作。进行了3D4d编织复合材料的纵向拉伸实验，该复合材料在切边和不切边之间具有不同的编织角度。然后建立具有界面区域的代表性体积单元（RVC），以通过断裂和损伤力学分析拉伸性能。施加了边缘和非边缘条件下的周期性边界条件来模拟破坏机理。进行了尖端条件下的应力-应变分布和损伤演化云图。数值结果与实验结果吻合。最后，通过叠加内部单元来模拟尖端效应随样品厚度的变化。结果表明，厚度的增加可以有效减少尖端对3D4d编织复合材料纵向强度的影响。编织复合材料的尖端仿真对实际工程应用具有指导意义。

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