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Manufacturing and low-velocity impact characterization of hollow integrated core sandwich composites with hybrid face sheets

机译：具有混合面板的中空集成芯夹芯复合材料的制造和低速冲击表征

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摘要

In the current study, 3-D hollow integrated core sandwich composite laminates with and without additional face sheets were fabricated using vacuum assisted resin infusion molding process in multiple steps. For additional facing, plain weave S2-glass and twill weave carbon fabrics were used on top and bottom sides of the panels in four different monolithic (S2-glass only, carbon only) and hybrid (glass + carbon, one with S2-glass layer outside and other with carbon layer outside) combinations. Square samples of 100 mm sides were subjected to low-velocity impact loading using an instrumented impact testing machine at 3 energy levels of 15, 30 and 45 J. Three samples were tested at each energy level. Impact parameters like peak load, time to peak load, deflection at peak load, and absorbed energy were evaluated and compared for different types of laminates. Failure modes were studied by sectioning the samples and observing under optical microscope. Results of the study indicate that the provision of additional face sheets considerably enhances the damage resistance. Of different facings, glass facing sustained maximum load followed by glass-carbon hybrid, carbon-glass hybrid, and carbon facings.
机译：在当前研究中，使用真空辅助树脂灌注成型工艺分多个步骤制造了带有和不带有其他面板的3-D中空集成芯夹心复合材料层压板。对于其他饰面，在面板的顶部和底部使用平纹编织S2-玻璃纤维和斜纹编织碳纤维织物，分别使用四种不同的整体式（仅S2-玻璃纤维，仅碳纤维）和混合纤维（玻璃+碳纤维，其中一种带有S2-玻璃纤维层）外层和其他带有碳层的外部）组合。使用仪器化的冲击测试仪，以15 J，30 J和45 J的3个能级对100 mm侧面的方形样品进行低速冲击载荷。每个能级测试3个样品。评估并比较了不同类型的层压板的冲击参数，如峰值负荷，峰值负荷时间，峰值负荷下的挠度和吸收的能量。通过将样品切片并在光学显微镜下观察来研究失效模式。研究结果表明，提供更多的面板可以大大提高抗损伤性。在不同的饰面中，玻璃饰面承受最大负载，其次是玻璃-碳混合，碳-玻璃混合和碳饰面。

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