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Title: EFFECT OF FATIGUE STRESS HISTORY ON ELASTICITY PROPERTIES AND STRESS DISTRIBUTION UNDER ROTATING BENDING

Abstract

Data are presented on the effect of fatigue stress amplitude and number of cycles on the stress-strain properties of mild steel under reversed axial (tension-compression) stress. Cyclic stress near the fatigue limit is shown to have a significant effect on the stress-strain properties and secant modulus of the material. The general significance of the observed changes in modulus properties on the stress distribution in a rotating beam are discussed. An analytical method is presented for determining the actual or specific stress- strain relationships from the moment-strain data of rotating beam fatigue specimens. This method is used to calculate the specific stress-strain relationships for mild steel, and these are compared with experimentally determined axial stress-strain data. The agreement is found to be good. The actual stress distributions in rotating cantilever-beam fatigue specimens are determined from the specific stress-strain relationships. The errors associated with nominal stress based on the accepted linear stress-strain relationship are analyzed. The effects of magnitude of stress and number of stress cycles on stress distribution are discussed. Fatigue data are presented on solid and hollow rotating beams and under axial stress. These data, compared on the Qasis of nominal stress, show poor agreement (12 to 30%). However, ifmore » compared on the basis of specific or true stress,, determined by the methods presented, the agreement is reasonably good (3 to 7%). (auth)« less

Authors:
;
Publication Date:
Research Org.:
Minnesota. Univ., Minneapolis
OSTI Identifier:
4350471
Report Number(s):
WADC-TR-56-122; AD-97186
NSA Number:
NSA-12-002314
DOE Contract Number:  
AF-33(616)-2803
Resource Type:
Technical Report
Resource Relation:
Other Information: Project title: MATERIALS ANALYSIS AND EVALUATION TECHNIQUES. Task title: FATIGUE PROPERTIES OF STRUCTURAL MATERIALS. Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING; CONFIGURATION; DEFORMATION; ERRORS; FATIGUE; MATERIALS TESTING; MATHEMATICS; ROTATION; SOLIDS; STEELS; TENSILE PROPERTIES

Citation Formats

Lidstrom, L.C., and Lazan, B.J. EFFECT OF FATIGUE STRESS HISTORY ON ELASTICITY PROPERTIES AND STRESS DISTRIBUTION UNDER ROTATING BENDING. United States: N. p., 1956. Web.
Lidstrom, L.C., & Lazan, B.J. EFFECT OF FATIGUE STRESS HISTORY ON ELASTICITY PROPERTIES AND STRESS DISTRIBUTION UNDER ROTATING BENDING. United States.
Lidstrom, L.C., and Lazan, B.J. Wed . "EFFECT OF FATIGUE STRESS HISTORY ON ELASTICITY PROPERTIES AND STRESS DISTRIBUTION UNDER ROTATING BENDING". United States. doi:.
@article{osti_4350471,
title = {EFFECT OF FATIGUE STRESS HISTORY ON ELASTICITY PROPERTIES AND STRESS DISTRIBUTION UNDER ROTATING BENDING},
author = {Lidstrom, L.C. and Lazan, B.J.},
abstractNote = {Data are presented on the effect of fatigue stress amplitude and number of cycles on the stress-strain properties of mild steel under reversed axial (tension-compression) stress. Cyclic stress near the fatigue limit is shown to have a significant effect on the stress-strain properties and secant modulus of the material. The general significance of the observed changes in modulus properties on the stress distribution in a rotating beam are discussed. An analytical method is presented for determining the actual or specific stress- strain relationships from the moment-strain data of rotating beam fatigue specimens. This method is used to calculate the specific stress-strain relationships for mild steel, and these are compared with experimentally determined axial stress-strain data. The agreement is found to be good. The actual stress distributions in rotating cantilever-beam fatigue specimens are determined from the specific stress-strain relationships. The errors associated with nominal stress based on the accepted linear stress-strain relationship are analyzed. The effects of magnitude of stress and number of stress cycles on stress distribution are discussed. Fatigue data are presented on solid and hollow rotating beams and under axial stress. These data, compared on the Qasis of nominal stress, show poor agreement (12 to 30%). However, if compared on the basis of specific or true stress,, determined by the methods presented, the agreement is reasonably good (3 to 7%). (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 1956},
month = {Wed Aug 01 00:00:00 EDT 1956}
}

Technical Report:
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