Behavior of small cracks under negative stress ratio fatigue loading

A. Roiko, J. Solin, H. Hänninen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.
Original languageEnglish
Pages (from-to)379-388
Number of pages10
JournalInternational Journal of Fatigue
Volume104
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

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Fatigue
Crack Growth Rate
Crack propagation
Crack
Fatigue of materials
Cracks
High Cycle Fatigue
In Situ Measurements
Optical Measurement
Fatigue testing
Notch
Crack Growth
Stress Intensity Factor
Compressive stress
Stress intensity factors
Testing

Cite this

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title = "Behavior of small cracks under negative stress ratio fatigue loading",
abstract = "In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.",
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Behavior of small cracks under negative stress ratio fatigue loading. / Roiko, A.; Solin, J.; Hänninen, H.

In: International Journal of Fatigue, Vol. 104, 2017, p. 379-388.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Roiko, A.

AU - Solin, J.

AU - Hänninen, H.

PY - 2017

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N2 - In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.

AB - In this paper we analyze growth of small cracks initiated from microscopic notches and loaded near the growth threshold under different stress ratios. The results of in-situ optical measurements during high cycle fatigue testing show that small cracks initiate and grow quickly after which there is a long period of slow growth until the large crack growth threshold is reached. The crack growth rate data from different loading ratios indicates that the positive portion of the stress amplitude or the maximum stress intensity factor can be used to compare crack growth rates. The test data also shows that increasing only the compressive stress portion of the loading will cause an arrested small crack to grow again.

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DO - 10.1016/j.ijfatigue.2017.07.006

M3 - Article

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SP - 379

EP - 388

JO - International Journal of Fatigue

JF - International Journal of Fatigue

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