Abstract
3D printing (also known as additive manufacturing) has been developed for more than 30 years. The applications of 3D printing have been increasingly extended to a variety of engineering fields in recent years. The sandwich material with a high strength and overall low density is a kind of artificial material that has been extensively used in various industrial and daily life applications. This paper presents a comprehensive vibration analysis and passive control technique for a cantilevered sandwich beam with an hourglass lattice truss core fabricated with 3D printing technology. The governing equation of the beam is established by using a homogenized model and the Hamilton's principle, from which the natural frequencies are determined. The theoretical model is verified by the results from the existing literature and the finite element analysis. The frequency response of the sandwich beam measured experimentally further validates the proposed model. Subsequently, a non-linear energy sink (NES) is proposed for being employed to passively suppress the vibration of the sandwich beam. A parametric study based on the theoretical model confirms the viability of using NES to effectively control the vibration of the sandwich beam. This work presents a good demonstration of using 3D printing technology for fabricating sandwich beams with a complicated lattice core. More importantly, some guidelines regarding the dynamic analysis of sandwich beams are provided. In addition, the analytical method presented in this work provides a potential means to theoretically explore the advantages of using sandwich beams for energy harvesting in the future.
Highlights
This paper presents a comprehensive study of the dynamics of the hourglass lattice core sandwich beam
The work of this paper provides a good example for the application of the 3D printing technology in the experimental study of sandwich composite structures
Considering the existence of various uncertainties during the fabrication and testing, such as the manufacturing error of the 3D printer, the material property deviation during the 3D printing process, etc., we believe that the experimental result can already be deemed a good validation for the theoretical model
Summary
Sandwich composite structures normally consisting of thin face sheets and a soft core have been extensively employed in industrial and daily applications, including civil, automotive engineering, and aerospace, etc., because of their light weight, high bending stiffness, outstanding sound, and thermal insulation properties (Evans et al, 2001; Kim et al, 2004; Ruzzene, 2004; Cote et al, 2007; Fan et al, 2008, 2010; Queheillalt et al, 2008; Roper, 2011). To the authors’ best knowledge, research on the dynamics and vibrations of 3D-printed sandwich structures is still rare It makes great sense in this paper to study the fabrication and vibration test of the sandwich beam with an hourglass lattice truss core. Considering the existence of various uncertainties during the fabrication and testing, such as the manufacturing error of the 3D printer, the material property deviation during the 3D printing process, etc., we believe that the experimental result can already be deemed a good validation for the theoretical model. The concept of using NES to control the vibration of the sandwich
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