Parametric studies on vibration characteristics of triply periodic minimum surface sandwich lattice structures
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ORIGINAL ARTICLE
Parametric studies on vibration characteristics of triply periodic minimum surface sandwich lattice structures Ugur Simsek1,2 · Tolga Arslan2 · Baris Kavas1 · Cemal Efe Gayir1 · Polat Sendur2 Received: 24 August 2020 / Accepted: 22 September 2020 © Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Additive manufacturing has opened new avenues for the manufacturing of structures to achieve challenging engineering tasks. Gyroid, a unique example of such structures, exhibits many attractive properties, such as high stiffness-to-weight ratio and impact characteristics. This study aimed to evaluate the dynamic performance of gyroid structures made from HS188 using direct metal laser melting. The frequency response predictions of a finite element-based model of the gyroid sandwich structure were first validated against the modal testing in terms of its natural frequencies and mode shapes using the Dewesoft software. Subsequently, the effects of the plate and gyroid wall thickness on the dynamic characteristics of the structure were investigated by varying these across their expected limit ranges as part of a parametric study using the validated finite element model. The findings from the parametric study were validated against modal testing. Moreover, the performance of the aforementioned structure was compared with that of a solid structure with the same mass. The simulation results indicated that the dynamic characteristics of the gyroid structure can be improved considering the structure’s frequency response by using parametric models. It was concluded that simulation and optimization tools will play a crucial role in additive manufacturing techniques to attain optimal mechanical properties of complex structures. Keywords Additive manufacturing · Double gyroid · Frequency response · Modal testing · Design optimization
1 Introduction A sandwich structure refers to two solid surfaces that are bonded by different density cores. These structures can be found in nature, such as bone tissue and wood [1]. Moreover, these structures are commonly used in the automotive, aerospace, aviation, and wind energy systems, owing to their competitive mechanical properties and lightweight characteristics. Two core types may exist, depending on the manufacturing methods: (i) a cellular structure, and (ii) a quasi-randomly distributed porous structure. In the former method, the core is fabricated by means of an interconnected network of surfaces or ligaments. The cellular core provides high resistance against bending and buckling forces, while maintaining a low
Polat Sendur
[email protected] 1
Additive Manufacturing, GE Aviation, Kocaeli, Turkey
2
Mechanical Engineering Department, Ozyegin University, Cekmekoy, Istanbul, Turkey
weight [2]. Its adjustable relative density, which may be as low as 2%, enables the structure to dissipate into plastic deformation and heat under quasi-static and dynamic loading [3–7]. The low volume fraction of sandwich panels makes them ideal for isolation
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