Article In: orcid
Effect of Non-Proportionality in the Fatigue Strength of 42CrMo4 Steel
Materials Science Forum
— 2012 — Trans Tech Publications, Ltd.
Key information
Authors:
Published in
11/12/2012
Abstract
<jats:p>The unexpected collapse of engineering structures is often caused by the fatigue phenomenon resulting from degradation of mechanical properties of materials due to multiaxial cyclic loadings. The interpretation of such degradation is a topic of intensive research in multiaxial fatigue. The fatigue strength is commonly evaluated by the equivalent stress based on the shear stress in the octahedral plane. However, the use of this kind of equivalent stress in the multiaxial fatigue criteria has been proven to be inappropriate. The degradation of mechanical properties of materials is dependent on several factors, e.g. the loading path has a strong influence on the fatigue strength. Non-proportional loadings cause higher damage in materials than proportional loadings for the same maximum equivalent stress. The purpose of this work is to study the effect of different multiaxial loadings on the 42CrMo4 steel and to improve the understanding about the relation between the fatigue strength and the sequential loading proportionality. The considered loadings were defined with the same history but with different load sequences and equivalent stress. To implement this work a biaxial servo-hydraulic fatigue machine was used. The fatigue life and crack angle were measured for each specimen. An analysis was made in order to correlate the crack initiation and fatigue life with the theoretical models, some remarks regarding these topics are presented.</jats:p>
Publication details
Authors in the community:
Luís Filipe Galrão dos Reis
ist13987
Manuel José Moreira de Freitas
ist11440
Publication version
VoR - Version of Record
Publisher
Trans Tech Publications, Ltd.
Title of the publication container
Materials Science Forum
First page or article number
757
Last page
762
Volume
730-732
ISSN
1662-9752
Fields of Science and Technology (FOS)
mechanical-engineering - Mechanical engineering
Publication language (ISO code)
eng - English
Rights type:
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