Radhakrishnan Ganesh, Breaz Daniel, Al Hattali Al Haitham Mohammed Sulaiman, Al Yahyai Al Muntaser Nasser, Al Riyami Al Muntaser Nasser Omar, Al Hadhrami Al Muatasim Dawood, Karthikeyan Kadhavoor R
Department of Mechanical Engineering, College of Engineering & Technology, University of Technology & Applied Sciences, Nizwa P.O. Box 477, Oman.
Department of Mathematics, "1 Decembrie 1918" University of Alba Iulia, 510009 Alba Iulia, Romania.
Materials (Basel). 2023 Oct 3;16(19):6544. doi: 10.3390/ma16196544.
In the field of engineering materials, lightweight and ultra-lightweight composites are used in real time to a greater extent, with high-performance targeting for tailor-made systems in aerospace, automotive, and biomedical applications. Sandwich composites are among the most popular lightweight materials used in structural and vehicle-building applications. In the present investigation, one such sandwich composite laminate composed of aluminum face sheets and a high-density polyethylene core was considered to analyze sandwich composites' flexural and buckling behavior experimentally and numerically. The influence of aspect ratios, such as length to thickness and width to thickness, on the flexural and buckling performance of sandwich composite laminates was explored in the study. Laminates with different widths, namely, 10, 12, and 15 mm, and a uniform thickness and length of 3 mm and 150 mm, respectively, were used for flexural analysis, whereas laminates with widths of 10, 12, and 15 mm and a uniform thickness and length of 3 mm and 350 mm, respectively, were used for buckling analysis. The geometrical influence of the laminates on mechanical performance was studied through performance measures such as critical bending load, flexural stiffness, inter-laminar shear stress, and critical buckling load. A significant influence of aspect ratio on the mechanical behavior of the laminates was observed using both experimental and numerical approaches. Flexural behavior was observed to be better at greater widths, namely, 15 mm, and with a minimum support span of 90 mm due to reduced spring back effects and increased bending resistance. A maximum width of 15 mm allowed for a higher buckling load capacity similar to that of bending resistance. A critical buckling load of 655.8 N seemed to be the maximum and was obtained for the highest aspect ratio, b/t = 5. The soft core and ductile metal face sheets offered combined resistance to both bending and buckling. A lower aspect ratio (span to thickness) rendered these sandwich laminates better in terms of both bending and buckling.
在工程材料领域，轻质和超轻质复合材料在实际应用中得到了更广泛的使用，其高性能目标是针对航空航天、汽车和生物医学应用中的定制系统。夹层复合材料是结构和车辆制造应用中最常用的轻质材料之一。在本研究中，考虑了一种由铝面板和高密度聚乙烯芯组成的夹层复合层压板，以通过实验和数值方法分析夹层复合材料的弯曲和屈曲行为。研究探讨了长宽比（如长度与厚度之比、宽度与厚度之比）对夹层复合层压板弯曲和屈曲性能的影响。分别使用宽度为10、12和15毫米、厚度均匀为3毫米、长度分别为150毫米和350毫米的层压板进行弯曲分析和屈曲分析。通过临界弯曲载荷、弯曲刚度、层间剪应力和临界屈曲载荷等性能指标研究了层压板的几何形状对力学性能的影响。使用实验和数值方法均观察到长宽比对层压板力学行为有显著影响。由于回弹效应减小和抗弯能力增强，在宽度为15毫米且最小支撑跨度为90毫米时，弯曲行为表现更好。最大宽度为15毫米时，屈曲承载能力较高，类似于抗弯能力。临界屈曲载荷655.8牛似乎是最大值，是在最高长宽比b/t = 5时获得的。软芯和韧性金属面板对弯曲和屈曲都具有综合抵抗力。较低的长宽比（跨度与厚度之比）使这些夹层层压板在弯曲和屈曲方面表现更好。
