Continuous estimation of the crack growth rate during rotating-bending fatigue testing

Gabriela Martinez-Cazares; Rafael Mercado-Solis; Yaneth Bedolla-Gil; Diego Lozano

doi:10.3390/met9030275

Continuous estimation of the crack growth rate during rotating-bending fatigue testing

Gabriela Martinez-Cazares, Rafael Mercado-Solis, Yaneth Bedolla-Gil, Diego Lozano^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

240 Downloads (Pure)

Abstract

A method for estimating the crack growth rate in steel during rotating-bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material’s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade.

Original language	English
Article number	275
Pages (from-to)	275
Journal	Metals
Volume	9
Issue number	3
DOIs	https://doi.org/10.3390/met9030275 https://doi.org/10.3390/met9030275
Publication status	Published - 1 Mar 2019

Bibliographical note

Funding Information:
literaturList of eSyresearmbols ch, R.M.-S. and Y.B.-G.; manuscript writing, D.L. and Y.B.-G. Funding: Grants UIN18513 & UIN18529 from Universidad de Monterrey. α = Normalized crack size Acknowledgments: The authors would like to thank Consejo Nacional de Ciencia y Tecnología (CONACYT), Universidada = Averdeage cMonterrrackeylengt, andhUniversidad Autónoma de Nuevo León for supporting this research. C = Material constant Conflicts of Interest: The authors declare no conflict of interest. D = Diameter of the gripped or loaded end of the specimen ListofD0Symbols= Nominal diameter of the specimen at which the stress is the greatest Dff = Diameter of the final fracture α=NormalizedDn = Diametercrackof the size remaining cross section after n cycles a = Average crack length C=MaterialΔK = Stconstantress intensity factor range

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

General Materials Science

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Cite this

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title = "Continuous estimation of the crack growth rate during rotating-bending fatigue testing",

abstract = "A method for estimating the crack growth rate in steel during rotating-bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material{\textquoteright}s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade.",

author = "Gabriela Martinez-Cazares and Rafael Mercado-Solis and Yaneth Bedolla-Gil and Diego Lozano",

note = "Funding Information: literaturList of eSyresearmbols ch, R.M.-S. and Y.B.-G.; manuscript writing, D.L. and Y.B.-G. Funding: Grants UIN18513 & UIN18529 from Universidad de Monterrey. α = Normalized crack size Acknowledgments: The authors would like to thank Consejo Nacional de Ciencia y Tecnolog{\'i}a (CONACYT), Universidada = Averdeage cMonterrrackeylengt, andhUniversidad Aut{\'o}noma de Nuevo Le{\'o}n for supporting this research. C = Material constant Conflicts of Interest: The authors declare no conflict of interest. D = Diameter of the gripped or loaded end of the specimen ListofD0Symbols= Nominal diameter of the specimen at which the stress is the greatest Dff = Diameter of the final fracture α=NormalizedDn = Diametercrackof the size remaining cross section after n cycles a = Average crack length C=MaterialΔK = Stconstantress intensity factor range Publisher Copyright: {\textcopyright} 2019 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

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doi = "10.3390/met9030275",

language = "English",

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AU - Mercado-Solis, Rafael

AU - Bedolla-Gil, Yaneth

AU - Lozano, Diego

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PY - 2019/3/1

Y1 - 2019/3/1

N2 - A method for estimating the crack growth rate in steel during rotating-bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material’s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade.

AB - A method for estimating the crack growth rate in steel during rotating-bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material’s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade.

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Continuous estimation of the crack growth rate during rotating-bending fatigue testing

Abstract

Bibliographical note

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Rotating Bending Fatigue Testing Machine 1000N

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Continuous estimation of the crack growth rate during rotating-bending fatigue testing

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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Other files and links

Fingerprint

Equipment

Rotating Bending Fatigue Testing Machine 1000N

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