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An Energy-Based Design Approach for a Meso-Structure With High Shear Flexure

[+] Author Affiliations
Prabhu Shankar

Oshkosh Corporation - JLG, Hagerstown, MD

Mohammad Fazelpour, Joshua D. Summers

Clemson University, Clemson, SC

Paper No. DETC2013-12292, pp. V03AT03A051; 10 pages
doi:10.1115/DETC2013-12292
From:
  • ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 3A: 39th Design Automation Conference
  • Portland, Oregon, USA, August 4–7, 2013
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5588-1
  • Copyright © 2013 by ASME

abstract

This paper presents a design approach for developing meso-structure for high shear flexure in considering distribution of strain energy for a unit cell. Currently, flexible components are often designed with elastomers to take advantage of their unique properties of low shear modulus and high elongation. However, elastomers exhibit high loss modulus at a high frequency when they are subjected to cyclic loading. As a design requirement to find an alternative material in one of the sub systems in the extraterrestrial rover, materials with high elongation but low energy loss is investigated using a meso-structure design approach. In this paper, an approach to design a meso-structure exhibiting shear flexure is developed by conducting comparative studies of shear flexure on three equivalent configurations: auxetic, honeycomb, and sinusoidal. Based on this comparative study, a new hypothesis is proposed that specific strain energy distribution pattern in these meso-structure has a direct impact on the high shear flexure performance. This proposition is verified by developing a new meso-structure, termed ‘S’-Type, which is compared with auxetic and sinusoidal auxetic meso-structures on their shear flexure ability. It is shown from this comparative analysis that the ‘S’-Type meso-structure exhibits higher shear flexure than the other two meso-structures at 5, 10, 20, and 40 MPa of effective shear moduli. Hence, based on this result, a four-step design approach is proposed to design future meso-structures with high shear flexure.

Copyright © 2013 by ASME

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