Severson Patrick, Lutz Anna, Elhajjar Rani
College of Engineering and Applied Science, University of Wisconsin-Milwaukee, 3200 N Cramer St., Milwaukee, WI 53211, USA.
Materials (Basel). 2024 Apr 19;17(8):1884. doi: 10.3390/ma17081884.
Joining structural components with mechanical fasteners is common in many engineering applications across all industries. This study investigates combining additive manufactured inserts with sandwich composites consisting of aluminum honeycomb cores with carbon fiber reinforced facesheets. The combination of these components offers an integrated, lightweight solution when mechanically fastening sandwich composite components using bolted joints. The experimental and numerical investigation explores the influence insert geometry has on the structural response of a sandwich composite under pull-through load scenarios. Various failure modes are observed during experimental analysis with facesheet debonding being the initial failure mode. In addition, finite element models investigate the stress fields in the honeycomb core and overall panel deflections, validating the mechanics observed experimentally. When comparing additively manufactured inserts to standard inserts, additively manufactured inserts have increases in stiffness, maximum force, and total energy absorption of 7.1%, 53.0%, and 62.3%, respectively. These results illustrate the potential of an integrated approach to mechanical joint technology by combining additively manufactured inserts with sandwich composite components using aluminum honeycomb cores.
在所有行业的许多工程应用中，使用机械紧固件连接结构部件很常见。本研究调查了将增材制造的嵌件与由铝蜂窝芯和碳纤维增强面板组成的夹层复合材料相结合的情况。当使用螺栓连接对夹层复合材料部件进行机械紧固时，这些部件的组合提供了一种集成的轻质解决方案。实验和数值研究探讨了嵌件几何形状对夹层复合材料在拉拔载荷情况下结构响应的影响。在实验分析过程中观察到了各种失效模式，面板脱粘是初始失效模式。此外，有限元模型研究了蜂窝芯中的应力场和整个面板的挠度，验证了实验中观察到的力学现象。将增材制造的嵌件与标准嵌件进行比较时，增材制造的嵌件在刚度、最大力和总能量吸收方面分别提高了7.1%、53.0%和62.3%。这些结果说明了通过将增材制造的嵌件与使用铝蜂窝芯的夹层复合材料部件相结合，采用集成方法实现机械连接技术的潜力。
