Contact Stresses in Dovetail Attachments: Physical Modeling
Author:
Sinclair G. B.1, Cormier N. G.2
Affiliation:
1. Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803-6413 2. General Electric Aircraft Engines, 1 Neumann Way, Cincinnati, OH 45215
Abstract
Simple physical models for the stresses in dovetail attachments are developed. These models address: to slip or not to slip, nominal stresses during loading up, peak contact and shear stresses during loading up, hoop stresses during loading up, peak contact and shear stresses during unloading, and hoop stresses during unloading. Comparisons are made with a previous paper on companion finite element modeling. Generally there is good agreement between the simple physical models and the finite element analysis. Together the two identify a pinching mechanism as leading to large fluctuations in hoop stresses at the edges of contact. These fluctuating hoop stresses can be expected to be a major contributor to the fatigue of dovetail attachments.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference9 articles.
1. Sinclair, G. B., Cormier, N. G., Griffin, J. H., and Meda, G., 2002, “Contact Stresses in Dovetail Attachments: Finite Element Modeling,” J. Eng. Gas Turbines Power, 124, 182–191. 2. Cormier, N. G., Smallwood, B. S., Sinclair, G. B., and Meda, G., 1999, “Aggressive Submodeling of Stress Concentrations,” Int. J. Numer. Methods Eng., 46, pp. 889–909. 3. Hertz, H. , 1882, “On the Contact of Elastic Solids,” J. Reine Agnew. Mat., 92, pp. 156–171 (in German: for an account in English, see Johnson, 1985, Ch. 4.2). 4. Johnson, K. L., 1985, Contact Mechanics, Cambridge University Press, Cambridge, U.K. 5. Sadowsky, M. A. , 1928, “Two-Dimensional Theory of Elasticity Theory,” Z. Angew. Mat. Mech., 8, pp. 107–121 (in German: for an account in English, see Johnson, 1985, Ch. 2.8).
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