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Title:Cyclic stress relaxation of U 700 and report 41 at elevated temperature
Author(s):Willem, R.A.; Morrow, JoDean
Subject(s):Cyclic Stress
Elevated Temperatures
Abstract:This report contains cycle stress-relaxation data for Udimet 700 and Rene 41, tested at an initial tensile means stress of 60,000 psii and a temperature of 1300°F. The tubular specimens were heated internally by a resistance heating element. Other features of the apparatus developed for this investigation are given. This apparatus permits the application of a constant amplitude of alternating strain about a fixed mean strain. Under these conditions, the mean stress is measured as a function of the number of cycles of repeated strain. Fatigue fracture data are also reported. The relaxation of mean stress measured in this investigation is similar to the relaxation of residual stress in parts which are subjected to high temperature and fatigue loading in service. This investigation shows that if a part is intended to last only a few thousand cycles, the initial residual stresses can be ignored since the fatigue loading will cause them to relax to zero. If the part is designed to last a large number of cycles, the initial residual stresses should be treated as part of the service stresses since little relaxation occurs near the fatigue limit.
Issue Date:1960-02
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 583
Genre:Technical Report
Sponsor:General Electric Company Evendale Plant Lab 60/02
Rights Information:Copyright 1960 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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