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首页> 外文期刊>Composite Structures >Influence of autoclaving process on the stability of thin-walled, composite columns with a square cross-section - Experimental and numerical studies
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Influence of autoclaving process on the stability of thin-walled, composite columns with a square cross-section - Experimental and numerical studies

机译：高压灭菌过程对薄壁，复合柱稳定性的影响 - 实验和数值研究

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摘要

Stability of thin-walled, composite, aerospace structures is a key issue in an analysis of its safety. This research aims to investigate the influence of the curing parameters on the stability (buckling behaviour) of thin-walled, GFRP laminates. Under inspection was taken the compression of eight-layered (layup [45/-45/45/-45]s), composite columns with a square cross-section with the dimensions: (width x height x thickness) 80 mm x 80 mm x 1.2 mm and length equal to 240 mm. The composite was cured in two autoclaving curing cycles. The first is a nominal curing cycle on an empty aluminium mandrel, while the second is a modified curing cycle on a full aluminium mandrel. To verify the quality of the manufactured composite, an assessment of the microstructure has been performed. Then, compression tests were performed and two FE models were pre pared, with and without the inclusion of residual stresses in the material. Additionally, for the purpose of the second FE model, coefficients of thermal expansion of the laminate were determined experimentally. A comparison of FE models with experimental data leads to the conclusion that residual stresses are not negligible and must be taken into account FE modelling of columns with closed cross-section.
机译：薄壁，复合，航空航天结构的稳定性是在其安全性分析中的关键问题。该研究旨在探讨固化参数对薄壁，GFRP层压板稳定性（屈曲行为）的影响。在检查下被取得八层（铺设[45 / -45 / 45 / -45]），复合柱，方形横截面，尺寸:(宽x高x厚度）80 mm x 80 mm x 1.2 mm，长度等于240 mm。复合材料在两个高压灭菌的固化循环中固化。第一是空铝心轴上的标称固化循环，而第二个是全铝心轴上的改进的固化循环。为了验证制造复合材料的质量，已经进行了微观结构的评估。然后，进行压缩测试，并将两种Fe模型预先削减，并且在不包括材料中的残余应力。另外，出于第二Fe模型的目的，实验确定层压板的热膨胀系数。 FE模型与实验数据的比较导致结论，残余应力不可忽略不可忽略，并且必须考虑具有封闭横截面的柱的CE模型。

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