Title: Improvement of the shape of ceramic piston head by optimization and FEM

Authors: H. Lahtinen, A. Pramila

Addresses: University of Oulu, Department of Mechanical Engineering, Laboratory of Engineering Mechanics, Oulu, Finland. ' University of Oulu, Department of Mechanical Engineering, Laboratory of Engineering Mechanics, Oulu, Finland

Abstract: In the present study, the shape of ceramic piston head was improved by optimization methods. The objective function used was failure probability. The polyaxiality of the stress field was in principle taken into account by the Principle of Independent Action, which is based on Weibull|s theory. However because of the large differences in principal stresses, the expression could be simplified. According to the results obtained the probability of failure decreased to 1/10 of the original the volume was reduced by 20 percent principal stress decreased.

Keywords: ceramic piston heads; diesel engines; finite element analysis; FEA; shape optimisation; failure probability; principal stress.

DOI: 10.1504/IJMPT.1991.036659

International Journal of Materials and Product Technology, 1991 Vol.6 No.4, pp.361 - 370

Published online: 05 Nov 2010 *

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