0

Full Content is available to subscribers

Subscribe/Learn More  >

Minimum Constraint Design Analysis and Modification of a Biaxial Tensile Test Fixture for Hyperelastic Materials

[+] Author Affiliations
Lowell Smoger, Mario Gomes, Elizabeth DeBartolo

Rochester Institute of Technology, Rochester, NY

Paper No. IMECE2011-63506, pp. 603-610; 8 pages
doi:10.1115/IMECE2011-63506
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5489-1
  • Copyright © 2011 by ASME

abstract

The focus of this study is to improve the operation of a biaxial tensile test fixture for use in characterizing hyperelastic materials. The test fixture in this study was constructed based on a design developed by Brieu, et al. [1]. Due to a combination of manufacturing and design issues the original test fixture was not able to provide acceptably accurate stressstrain data. Based on visual inspection of the machine during operation, it was hypothesized that the as-built system over-constrained certain components, which resulted in binding of the specimen grips. This binding made large displacement tests inaccurate and added to the error introduced in obtaining a 1:1 equibiaxial load ratio on a test specimen. A minimum constraint design (MCD) analysis was conducted in order to establish the degree to which the original design was over-constrained, and to ensure that the newly proposed system would function properly. Due to symmetry, the design analysis of the test fixture was simplified to one half of the machine. A modified design of the test fixture was subsequently developed and built to satisfy the minimum constraint design theory. Modifications include an alignment shaft, spherical bushings, and a planar alignment plate. The new fixture design exhibits no binding and an improved biaxial load ratio. Previously, only load ratios of 0.85:1 had been achieved, but the new design achieves the desired equibiaxial loading. Tighter component tolerances have also reduced backlash when reversing from tension to compression during a test, improving the ability to obtain load-displacement data for both the load and unload paths of a specimen.

Copyright © 2011 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In