Structural instability, which is often referred to as buckling, is a major concern for the safe and reliable design of composite structures. Thin-walled composite structures are vulnerable to buckling. The problem is exacerbated when a hole in a thin-walled composite structure significantly reduces the buckling strength of the structure. Therefore, the objective of the current research is to reduce the significant drop in buckling strength due to the hole by hybridizing with a stiffer material. Basalt fiber reinforced plastics (BFRP) was used for the current research work because it exhibits mechanical properties comparable with those of glass fiber reinforced plastics (GFRP) but at a reduced price, making it a prospective substitute for GFRP. Experimental and numerical methods were employed to study the buckling behavior of seven different hybrid laminates. A strut buckling apparatus was used for the experimental work. Furthermore, non-linear buckling analysis in combination with eigenvalue buckling analysis was used to estimate the non-linear behavior of the composite. It was found that the hybridization of BFRP with carbon fiber reinforced plastics is effective in reducing the effect of a hole in the buckling strength reduction. Furthermore, the buckling resistance is influenced by the orientation of outer plies, the location of the stiffer material in the laminate and the location of less stiff material in the laminate.

中文翻译：

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杂交对多孔CFRP / BFRP层压板屈曲行为的影响

结构不稳定性（通常称为屈曲）是复合结构安全可靠设计的主要问题。薄壁复合结构易受屈曲。当薄壁复合结构中的孔显着降低结构的屈曲强度时，该问题会加剧。因此，当前研究的目的是通过与较硬的材料杂交来减少由于孔引起的屈曲强度的显着下降。玄武岩纤维增强塑料（BFRP）被用于当前的研究工作，因为它具有与玻璃纤维增​​强塑料（GFRP）相当的机械性能，但价格却较低，使其成为GFRP的潜在替代品。实验和数值方法被用来研究七个不同的混合层压板的屈曲行为。支柱屈曲设备用于实验工作。此外，非线性屈曲分析与特征值屈曲分析相结合，用于估计复合材料的非线性行为。已经发现，BFRP与碳纤维增强塑料的杂化有效地减小了孔在屈曲强度降低中的作用。此外，抗屈曲性受外层的取向，层压材料中较硬材料的位置以及层压材料中较硬材料的位置影响。非线性屈曲分析与特征值屈曲分析相结合，用于估计复合材料的非线性行为。已经发现，BFRP与碳纤维增强塑料的杂化在减小屈曲强度降低中的孔效应方面是有效的。此外，抗屈曲性受外层的取向，层压材料中较硬材料的位置以及层压材料中较硬材料的位置影响。非线性屈曲分析与特征值屈曲分析相结合，用于估计复合材料的非线性行为。已经发现，BFRP与碳纤维增强塑料的杂化在减小屈曲强度降低中的孔效应方面是有效的。此外，抗屈曲性受外层的取向，层压材料中较硬材料的位置以及层压材料中较硬材料的位置影响。