Influence of Nesting on Mechanical Properties of Plain Woven Composite
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摘要: 针对平纹编织复合材料中复杂的纱线几何形状及层压过程中铺层间相互滑移嵌套的现象，本文基于域分解法建立参数化的双铺层单胞有限元模型。该模型分别建立纱线域和整体域，采用节点自由度耦合方法使两相重合区域满足变形协调关系，通过对纱线域的材料属性进行修正处理实现了材料力学性能的完全等效。研究表明，嵌套会导致平纹编织复合材料层合板弹性模量增大约15%，通过对影响因素的分析明确了纤维体积含量的改变是力学性能变化的主要原因。Abstract: Considering the complex geometric architecture and nesting phenomenon in manufacturing process of plain woven composite laminates, the parametric double-layer representative unit cell is developed based on the domain decomposition technique. In the present model, the yarn domains and global domain are built up separately, subsequently the two domains are superimposed by using the nodal degree of freedom coupling technique. Finally the material models for yarn domains are adjusted to achieve the equivalent physical properties with actual composite systems. Based on the validated numerical model, the results indicate that the nesting leads to increasing in module by about 15% for woven composite laminates. Furthermore, the change in the fiber volume frication caused by nesting is found to be the primary factor for the variation of mechanical properties.
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Key words:
- nesting /
- microstructure /
- woven composite /
- domain decomposition /
- finite element method
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表 1 试件CE40的几何参数
参数 数值 纱线宽度/mm 1.67 纱线厚度/mm 0.28 间隙/mm 0.1 单层厚度/mm 0.92 纤维体积含量/% 37.4 纱线填充系数/% 75.1 
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表 2 纤维和基体的性能参数
材料 纵向模量/GPa 横向模量/GPa 面内剪切模量/GPa 面外剪切模量/GPa 纤维 230 40 24 14.3 基体 3.5 3.5 1.3 1.3
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表 3 DRUC模型与Zhang仿真结果对比
参数 Zhang[4] DRUC模型 误差/% E3/GPa 8.10 8.27 2.10 G13/GPa 2.90 2.63 9.31
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表 4 验证模型M1预测的弹性性能与嵌套模型偏差
嵌套量 E1 E3 G12 结果/GPa 偏差/% 结果/GPa 偏差/% 结果/GPa 偏差/% 1.05 33.9 1.8 8.6 0.6 4.3 6.1 1.10 36.0 3.8 8.9 1.1 4.8 14.8 1.15 38.4 6.0 9.2 0.4 5.4 20.4 1.18 40.0 8.8 9.4 1.4 5.9 33.1
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