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Experimental, numerical and analytical results for bending and buckling of rectangular orthotropic plates

机译：矩形正交异性板弯曲和屈曲的实验，数值和分析结果

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摘要

Solid unstiffened, sandwich and hat-stiffened rectangular orthotropic fiber reinforced plastic (FRP) plates were tested for buckling by in-plane compression and for stresses and deflections under uniform out-of plane pressure. The solid unstiffened and hat-stiffened plates were 154 × 77 cm (1 × w) (72 × 36 in), while the sandwich plates were 102 × 77 cm (1 × w) (48 × 36 in). Balsa core was used in the sandwich plates and in the hat-stiffeners. The two short edges of the unstiffened and sandwich plates were clamped, while the two long edges were simply supported. The two long edges of the hat-stiffened plates were free, while the short edges were clamped. The buckling load, as well as stresses and deflections from the tests, were then compared to those from finite element analysis (FEA) and analytic solutions. There was reasonably good agreement between FEA, analytic, and experimental buckling stresses for the unstiffened solid plates. There was reasonable agreement in buckling stresses between FEA and experi- mental results for the hat-stiffened plate. There was poor agreement between FEA, analytic, and experimental elastic buckling results for the sandwich plates because they failed in local buckling prior to global buckling. Under out-of plane uniform pressure, FEA and analytic solutions of the stresses and deflections for the unstiffened solid plates agreed well with experimental results. There was poor agreement between FEA and experimental results for stresses and deflections of the hat-stiffened or sandwich plates. Experimental error could be traced, in part, to plate fabrication, the method of applying out-of plane pressure, edge support, and instrumentation accuracy.
机译：测试了未加固的固体，夹心和帽加固的矩形正交异性纤维增强塑料（FRP）板在平面内压缩下的屈曲以及在均匀的平面外压力下的应力和挠度。固态未加硬板和帽子加硬板为154×77厘米（1×宽）（72×36英寸），而夹心板为102×77厘米（1×宽）（48×36英寸）。在夹心板和帽子加硬件中使用轻木芯。夹住未加固板和夹心板的两个短边，同时简单地支撑两个长边。帽子加固板的两个长边是自由的，而短边则被夹紧。然后将屈曲载荷以及试验的应力和挠度与有限元分析（FEA）和解析解的屈曲载荷进行比较。对于未加筋的实心板，FEA，分析和实验屈曲应力之间有相当好的一致性。帽子加硬板的有限元分析和实验结果之间的屈曲应力有合理的一致。夹层板的FEA，分析和实验弹性屈曲结果之间的一致性差，因为它们在整体屈曲之前在局部屈曲中失败。在平面外均匀压力下，未加筋的实心板的应力和挠度的有限元分析和解析解与实验结果吻合良好。 FEA和实验结果在帽子加硬或夹层板的应力和挠度方面不一致。实验误差可以部分归因于板制造，施加平面外压力的方法，边缘支撑和仪器精度。

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