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Experimental and numerical investigation of stiffener effects on buckling strength of composite laminates with circular cutout
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2019-09-23 , DOI: 10.1177/0021998319874101
T Shojaee 1 , B Mohammadi 1 , R Madoliat 1
Affiliation  

In the notched structures, to achieve maximum buckling resistance in comparison with structural weight, the optimal design of a stiffener is very important. In this research, after a review of the existing literature, nonlinear buckling behavior of composite plates containing the cutout with three different designs of stringer was investigated. The considered stiffeners are planer, longitudinal, and ring types. The buckling experiments were carried out on the stiffened plates containing a circular notch. Moreover, to achieve an efficient prediction of the buckling in the stiffened laminate with the hole, a finite strip method is developed based on the Airy stress function and von Karman’s large deformation equations. Studies show that there is a good agreement between the postbuckling behaviors derived from developed finite strip method with experimental results. Fast convergence of the considered finite strip method compared with the finite element results shows its efficiency for prediction of buckling behavior in laminated composites. The results show that the buckling load-bearing capacities of perforated plates with a longitudinal and planer stiffener are higher compared with the other stiffener, respectively. The detailed parametric study on the effects of thickness of the plate and stiffener and opening diameter on buckling behavior was performed using experiments and modeling.

中文翻译:

加强筋对圆形切口复合材料层合板屈曲强度影响的实验和数值研究

在缺口结构中,与结构重量相比,要获得最大的屈曲阻力,加强筋的优化设计非常重要。在这项研究中,在回顾现有文献后,研究了包含三种不同纵梁设计的切口的复合板的非线性屈曲行为。所考虑的加劲肋为平面型、纵向型和环型。屈曲实验是在带有圆形缺口的加筋板上进行的。此外,为了有效预测带孔加筋层板的屈曲,基于艾里应力函数和冯卡曼大变形方程开发了一种有限条法。研究表明,从开发的有限条带方法导出的后屈曲行为与实验结果之间存在良好的一致性。与有限元结果相比,所考虑的有限条方法的快速收敛表明其预测层压复合材料屈曲行为的效率。结果表明,与其他加劲肋相比,具有纵向和平面加劲肋的穿孔板的屈曲承载能力分别较高。使用实验和建模对板和加强筋的厚度和开口直径对屈曲行为的影响进行了详细的参数研究。与有限元结果相比,所考虑的有限条方法的快速收敛表明其预测层压复合材料屈曲行为的效率。结果表明,与其他加劲肋相比,具有纵向和平面加劲肋的穿孔板的屈曲承载能力分别较高。使用实验和建模对板和加强筋的厚度和开口直径对屈曲行为的影响进行了详细的参数研究。与有限元结果相比,所考虑的有限条方法的快速收敛表明其预测层压复合材料屈曲行为的效率。结果表明,与其他加劲肋相比,具有纵向和平面加劲肋的穿孔板的屈曲承载能力分别较高。使用实验和建模对板和加强筋的厚度和开口直径对屈曲行为的影响进行了详细的参数研究。
更新日期:2019-09-23
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