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RESEARCH PAPERS: Reliability, Stress Analysis, and Failure Prevention Papers

Theoretical and Experimental Study of the Stress Concentration Factor in Diesel Engine Crankshafts

[+] Author and Article Information
M. Guagliano, A. Terranova, L. Vergani

Dipartimento di Meccanica, Politecnico di Milano, P. zza.L.da Vinci, 32, Milano, Italy

J. Mech. Des 115(1), 47-52 (Mar 01, 1993) (6 pages) doi:10.1115/1.2919323 History: Received May 01, 1991; Online June 02, 2008

Abstract

The paper deals with the bending stress concentration evaluation of a marine diesel engine crankshaft. Experimental strain gauge tests were conducted on a full scale single crank to measure the stress concentration near the crank fillet. A three-dimensional finite element schematization of the crankshaft and the linear elastic calculations conducted show the stress field along the most overstressed zone and how it is influenced by different load conditions. It is now possible to calculate accurately the stress concentration factor Kt . However, a mesh of a mechanical element with a complex geometry like crankshaft is very expensive and difficult. Therefore a bidimensional model of the crankshaft has been also considered: experimental tests and numerical analyses under different load conditions were also carried out in this case. The agreement between the results obtained from these different kinds of analyses is good. The values of the stress concentration factors obtained from bidimensional and three-dimensional analysis with the same boundary and load conditions are similar. A plane model of crankshaft can be utilized to determine the theoretical stress concentration factor Kt with considerable saving of calculation time.

Copyright © 1993 by The American Society of Mechanical Engineers
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