Development of an electromagnetic compatible composite-insert embedded in a double-curved sandwich panel

IF 3.5 3区 材料科学 Q1 ENGINEERING, MECHANICAL
Majid Mokhtari
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Abstract

Composite sandwich structures, which are widely employed in engineering structures, require a multitude of inserts. In certain instances, the necessity for a specialized insert arises from the unique characteristics of a particular application. In applications such as weather radar radomes, double-curved sandwich panels should be designed with electromagnetic (EM) transparency as a primary objective. The use of metal inserts should be restricted to the absolute minimum. Given the limitations of using metal materials to protect against EM radiation and the need to enhance the load-bearing capacity of the joint against pull-out loads, a composite insert has developed as an innovative solution. In this study, a composite insert of a double-curved sandwich dome has been developed using silica nanoparticles, and its mechanical strength against pull-out load has been evaluated through both experimental and numerical analysis. The strength results obtained have been compared with analytical estimates. Additionally, the buckling of the double-curved sandwich dome against a wind speed of 220 km/h has been investigated numerically. The critical buckling load for wind loading for the full-scale sandwich radome was estimated to be 16,303 N. According to the numerical results obtained with the Abaqus finite element (FE) software, the maximum pull-out force applied to the connection area is approximately 10.7 kN. A parametric study of geometric variables and experimental results showed that it is possible to achieve a stronger composite insert (by 1 wt % nano silica particles) by 20.7% lighter and 102.65% more bearing capacity.
开发嵌入双曲面夹芯板的电磁兼容复合插件
工程结构中广泛使用的复合材料夹层结构需要大量的插件。在某些情况下,由于特定应用的独特性,需要使用专门的嵌件。在气象雷达天线罩等应用中,双曲面夹层板的设计应以电磁(EM)透明度为主要目标。金属嵌件的使用应限制在绝对最低限度。考虑到使用金属材料防电磁辐射的局限性,以及提高连接处抗拉承载能力的需要,一种创新的解决方案--复合插入物应运而生。在这项研究中,使用纳米二氧化硅颗粒开发了一种双曲面夹层圆顶复合插入件,并通过实验和数值分析评估了其抗拉拔载荷的机械强度。获得的强度结果与分析估算结果进行了比较。此外,还对双曲面夹层穹顶在 220 km/h 的风速下的屈曲进行了数值研究。根据 Abaqus 有限元(FE)软件得出的数值结果,施加在连接区域的最大拉拔力约为 10.7 千牛。几何变量参数研究和实验结果表明,通过使用 1 wt % 的纳米二氧化硅颗粒,可以使复合材料插入件的重量减轻 20.7%,承载能力提高 102.65%,从而达到更高的强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Sandwich Structures & Materials
Journal of Sandwich Structures & Materials 工程技术-材料科学:表征与测试
CiteScore
9.60
自引率
2.60%
发文量
49
审稿时长
7 months
期刊介绍: The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).
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