Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion

Fatigue behaviour of DIN 34CrNiMo6 lateral notched round bars subjected to in-phase bending-torsion loading was investigated. Experimental tests were conducted under constant amplitude loading with stress ratios close to zero. Crack initiation and crack growth were monitored in-situ using a high-re...

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Main Authors: Branco Ricardo, Costa J.D., Antunes F.V.
Format: Article
Language:English
Published: EDP Sciences 2014-06-01
Series:MATEC Web of Conferences
Online Access:http://dx.doi.org/10.1051/matecconf/20141208004
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spelling doaj-a80f7e85d44a4ff9970561079a619fe82021-04-02T13:16:33ZengEDP SciencesMATEC Web of Conferences2261-236X2014-06-01120800410.1051/matecconf/20141208004matecconf_jip14_08004Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsionBranco RicardoCosta J.D.0Antunes F.V.1CEMUC, Department of Mechanical Engineering, University of CoimbraCEMUC, Department of Mechanical Engineering, University of Coimbra Fatigue behaviour of DIN 34CrNiMo6 lateral notched round bars subjected to in-phase bending-torsion loading was investigated. Experimental tests were conducted under constant amplitude loading with stress ratios close to zero. Crack initiation and crack growth were monitored in-situ using a high-resolution digital system. Fracture surfaces were examined by scanning electron microscope (SEM). A multi-crack initiation phenomenon from material defects at the notch surface was found. The SEM analyses revealed the presence of relatively high inclusions with sizes ranging from 2 to 30 μm. Finally, fatigue life predictions were carried out using both the Coffin-Manson (CM) and the Smith-Watson-Topper (SWT) models. The notch effect was simulated with the Theory of Critical Distances (TCD) and the Equivalent Strain Energy Density (ESED) concept. Regardless of the model, very good correlations between experimental and predicted fatigue lives were observed, particularly for lives greater than 104 cycles. http://dx.doi.org/10.1051/matecconf/20141208004
collection DOAJ
language English
format Article
sources DOAJ
author Branco Ricardo
Costa J.D.
Antunes F.V.
spellingShingle Branco Ricardo
Costa J.D.
Antunes F.V.
Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
MATEC Web of Conferences
author_facet Branco Ricardo
Costa J.D.
Antunes F.V.
author_sort Branco Ricardo
title Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
title_short Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
title_full Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
title_fullStr Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
title_full_unstemmed Influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
title_sort influence of loading pattern in fatigue life for notched round bars subjected to bending-torsion
publisher EDP Sciences
series MATEC Web of Conferences
issn 2261-236X
publishDate 2014-06-01
description Fatigue behaviour of DIN 34CrNiMo6 lateral notched round bars subjected to in-phase bending-torsion loading was investigated. Experimental tests were conducted under constant amplitude loading with stress ratios close to zero. Crack initiation and crack growth were monitored in-situ using a high-resolution digital system. Fracture surfaces were examined by scanning electron microscope (SEM). A multi-crack initiation phenomenon from material defects at the notch surface was found. The SEM analyses revealed the presence of relatively high inclusions with sizes ranging from 2 to 30 μm. Finally, fatigue life predictions were carried out using both the Coffin-Manson (CM) and the Smith-Watson-Topper (SWT) models. The notch effect was simulated with the Theory of Critical Distances (TCD) and the Equivalent Strain Energy Density (ESED) concept. Regardless of the model, very good correlations between experimental and predicted fatigue lives were observed, particularly for lives greater than 104 cycles.
url http://dx.doi.org/10.1051/matecconf/20141208004
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