Investigations on the Fatigue Crack Propagation Threshold in Very High Cycle Fatigue

Chong Wang; Danièle Wagner; Claude Bathias

doi:10.4028/www.scientific.net/AMR.891-892.357

Paper Titles

Crack Growth Threshold Criterion Based on Calculation of Dynamic Stress Intensity Factors in the Mixed Mode (Complex Functions Theory Approach)
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Influence of the Inclusion Type on the Threshold Value of Failure in the VHCF-Regime of High-Strength Steels
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Comparison of SGBEM-FEM Alternating Method and XFEM Method for Determining Stress Intensity Factor for 2D Crack Problems
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Influence of Crack Retardation on Fatigue Crack Propagation in Steels for Railway Axles
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Investigations on the Fatigue Crack Propagation Threshold in Very High Cycle Fatigue
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J-Integral Approach to Creep-Fatigue Crack Propagation in Lead-Free Solder under Various Loading Waveforms
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Determination of Creep Crack Growth Threshold by Experiments under Elevated Temperature with Pre-Stressed Specimens
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Low Cycle Fatigue Behavior and Mechanism of Newly Developed Advanced Heat Resistant Austenitic Stainless Steels at High Temperature
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Low Cycle Fatigue and Creep-Fatigue Interaction Behaviour of Reduced Activation Ferritic Martensitic (RAFM) Steels with Varying W and Ta Contents
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 891-892Investigations on the Fatigue Crack Propagation...

Investigations on the Fatigue Crack Propagation Threshold in Very High Cycle Fatigue

Abstract:

Pariss law of fatigue crack propagation rate is well applied in the defect-tolerance fatigue approach. When carry out same approach in the very high cycle fatigue domain, the understanding of mechanism about fatigue crack propagation threshold which is obviously important, is helped. In the present work here, the fatigue crack propagation threshold of a surface crack for an Armco iron loaded in the VHCF regime was investigated by a new approach which combines the fracture surface analysis and the temperature recording on the surface during the test by an infra-red camera. The experiments were carried out on a sheet specimen under a 20 kHz ultrasonic frequency loading with IR images registration. Three stages of fatigue crack were identified with different mechanisms. It is found that the transition between initiation and crack propagation corresponds to the intrinsic fatigue threshold. It takes more than 99% of the gigacycle fatigue life to achieve this transition size.

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Periodical:

Advanced Materials Research (Volumes 891-892)

Pages:

357-362

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.891-892.357

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Cite this paper

Online since:

March 2014

Authors:

Chong Wang, Danièle Wagner*, Claude Bathias

Keywords:

Fatigue Crack Initiation, Microplasticity, Thermal Investigation, Threshold of Fatigue Crack Propagation, Very High Cycle Fatigue (VHCF)

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* - Corresponding Author

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