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Axial-torsional fatigue: A study of tubular specimen thickness effectsA room-temperature experimental program was conducted on AISI type 316 stainless steel to determine the effect of wall thickness on the cyclic deformation behavior and fatigue life of thin-wall, tubular, axial-torsional fatigue specimens. The following experimental variables were examined in this study: the depth of the surface work-hardened layer produced in specimen machining, and the effects of strain range and axial-torsional strain phasing. Tubular fatigue specimens were fabricated with wall thicknesses of 1.5, 2.0, and 2.5 mm. One as-fabricated specimen from each wall thickness was sectioned for microstructural examination and microhardness measurement. A specimen of each wall thickness was tested at each of three conditions - high strain range in-phase, low strain range in-phase, and low strain range out-of-phase - for a total of nine axial-torsional fatigue experiments. The machining-induced work-hardened zone, as a percentage of the gage section material, was found to have a minimal effect on both deformation behavior and fatigue life. Also, little or no variation in fatigue life or deformation behavior as a function of wall thickness was observed. Out-of-phase fatigue tests displayed shorter fatigue lives and more cyclic hardening than in-phase tests.
Document ID
19910005319
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Bonacuse, Peter J. (NASA Lewis Research Center Cleveland, OH., United States)
Kalluri, Sreeramesh (Sverdrup Technology, Inc., Brook Park OH., United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1990
Subject Category
Structural Mechanics
Report/Patent Number
AD-A231725
NASA-TM-103637
NAS 1.15:103637
E-5814
AVSCOM-TM-90-C-014
Accession Number
91N14632
Funding Number(s)
PROJECT: RTOP 505-63-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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