A finite element approach of deriving the von Mises, shear, and contact stresses of double shear-plane revolute joints in the elastic domain

Stubbs, Christopher
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Gutierrez-Miravete, Ernesto
Bose, Sudhangshu
Lemcoff, Norberto
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Mechanical engineering
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The current engineering community uses finite element analyses in the development and design of double shear-plane clevis connections. Although accurate, finite element analyses of this nature are non-linear in nature, and are often both time consuming and computationally intensive. This thesis presents an approach for sizing frictionless double shear-plane clevis connections to be under their material yield strengths for their given application. This will lessen the need for the engineering community to rely on finite element analysis in designing these clevis connections. Instead, simple empirical formulae may be used. This has the advantage of (1) not needing specialized personnel to develop finite element models, (2) much shorter analysis time, and (3) a much shorter iteration time to understand what dimensions and variables are most critical for a given clevis system. Finite element analysis is utilized to simulate testing for purposes of developing empirical formulae based on the load through the connection, lug widths, lug gaps, Young's moduli, and Poisson ratios. Regression analysis is then used to derive closed-form empirical formulae, using multiplication factors based upon each parametric evaluated. A verification analysis is performed to evaluate the error of the empirical formulae, and acceptable levels of accuracy are verified. The average error for the formulae for maximum von Mises in the lug and pin, maximum shear stress in the lug and pin, and maximum contact pressure between the lug and pin were found to be between 1.4% and 6.8%.
December 2014
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
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