Simulation analysis and verification of the effect of stacking sequence on tensile properties of preform laminated composites
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摘要: 使用有限元理论模拟分析了几种不同铺层顺序的预成型体搭接复合材料的拉伸性能，并且使用国产碳纤维与快速固化环氧树脂制备相应的单下陷搭接试样，测试其搭接接头的拉伸性能，对有限元计算结果进行了验证。结果表明，使用有限元计算与实验方法得到的结果基本相符。有限元模拟及实验验证发现不同铺层结构的预成型体搭接复合材料有两种不同的破坏损伤模式。搭接上层板的层间剥离强度与层板本身弯曲性能共同决定了搭接接头的破坏模式及拉伸性能，两者中强度较弱的先发生破坏，导致试样失效。在预成型体搭接接头中，0°铺层越靠近搭接面，对搭接性能的影响越明显，搭接强度越高。搭接界面处纤维层之间的相对角度不同，纤维铺层刚度不同，刚度差别越大，搭接强度就越低。Abstract: In this paper, the finite element method was used to simulate and analyze the tensile properties of several pre-molded lap composites with different lamination sequences respectively. The corresponding joggle-lap joint samples were prepared by using domestic carbon fiber and rapid curing epoxy resin. The tensile properties of the lap were tested, and the results of finite element calculation were verified. The calculated results obtained by finite element method are basically consistent with the experimental results. It's found that there are two different failure modes of the preform lap joints with different stacking sequence. The interlaminar peel strength and the flexual property of the plate both determine the failure mode and tensile performance.The weaker damages first, resulting in the failure of the sample. In the preform lap joint, the closer the 0° ply lay to the lap face, the more obvious the influence on lap bonding performance is, and the lap strength performs better. And different relative angle between the fiber layers leads to different stiffnesses distinction. The bigger the difference is, the weaker the joint performs.
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Keywords:
- composite /
- stacking sequence /
- preform lap joint /
- mechanical properties /
- finite element analysis
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