平面机织复合材料低温力学性能数值分析与试验验证
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Numerical Analysis and Test Evaluation on Cryogenic Mechanical Properties of Two-Dimensional Woven Composite
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    摘要:

    建立了单向玻璃纤维增强复合材料及酚醛树脂基平面机织复合材料层合板周期性单胞三维(3-D)有限元模型,在两个模型的有限元分析中引入周期性边界条件,保证了周期性单胞边界面的应力和应变的连续性。通过有限元模拟获得单向纤维增强材料的各项力学参数。模拟了常温及低温情况下基体模量改变这两种情况下层合板拉伸、压缩和剪切的渐进损伤过程。引入合适的损伤起始和损伤扩展准则,预测了层合板在两载荷下的破坏过程。在常温和-50℃两种情况下,对平面机织复合材料进行了拉伸、压缩、剪切试验。将有限元模拟结果与层合板在常温和低温下的试验结果进行了对比,进一步讨论了影响酚醛树脂基复合材料层合板低温力学性能的因素,得出了材料在低温情况下力学性能优于常温情况,同时也用试验验证了分析方法的正确性。

    Abstract:

    Three-dimensional periodic finite element models of unidirectional composites and phenolic resin matrix two dimensional woven composite laminates are established. The periodical boundary conditions are applied to the finite element method (FEM) analysis of the two models to ensure stress continuous and strain continuous on boundary surfaces. The mechanical parameters of unidirectional composites are obtained by FEM analysis. The tensile, compression and shear progressive damage analysis of the laminates are simulated at normal temperature and when the modulus of phenolic resin is changed at the low temperature of -50 ℃. Appropriate criterions are chosen to predict the failure process of the laminates. The tensile, compression and shear tests are conducted at normal temperature and the low temperature of -50 ℃ of the two-imensional woven composite. The FEM results are compared with the experimental results to acquire the factors affecting the mechanical properties of phenolic resin matrix composite laminates at low temperature。The results prove that the mechanical properties of the composite at low temperature are better than those at normal temperature, verifying the correctness of the analysis method by the test.

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周光明,王宁.平面机织复合材料低温力学性能数值分析与试验验证[J].南京航空航天大学学报,2014,46(6):838-844

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  • 在线发布日期: 2014-12-26
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