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RESEARCH PAPERS

Elasto-Plastic Cyclic Analysis of Structural Members

[+] Author and Article Information
H. A. Koenig

The University of Connecticut, Storrs, Conn.

W. Vogel

Pratt & Whitney Division, United Aircraft Corporation, East Hartford, Conn.

L. Cernoch

Wesleyan University, Middletown, Conn.

J. Eng. Power 94(3), 214-218 (Jul 01, 1972) (5 pages) doi:10.1115/1.3445675 History: Received October 13, 1971; Online July 14, 2010

Abstract

A two-dimensional elasto-plastic finite element analysis is developed herein which has the capability of analyzing structural members which are subjected to cyclic thermal-mechanical loadings. This analysis, therefore, is of great value in gas turbine applications. The analysis, which is based on an effective stress-strain formulation, employs a tangent modulus approach in its execution. Both principal and conventional stresses are computed in the body. Unloading procedures are established and subsequently employed in cyclic loading problems. Several examples are presented. A turbine blade shroud, which has been mechanically loaded due to interference with its adjacent member, is analyzed. Cyclic behavior is shown for a uniaxial tension specimen and then generalized to a multiaxial stress state. A “predictor-corrector” procedure, which calculates the most efficient loading increment, is developed. Analyses of stress concentration factors and thermal stress applications are also presented.

Copyright © 1972 by ASME
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