Fatigue crack growth under random loading

Alawi, H.; Shaban, Mahmoud M.

doi:10.1016/0013-7944(89)90181-1

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…Much higher rates of one to two complex cycles/sec were used in growing the cracks on the MTS machine. The differences in the loading rates were not expected to affect the behavior of the fatigue cracks nor the acoustic emissions produced [5,6].…”

Section: Laboratory Fatigue Testsmentioning

confidence: 99%

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Sison

Duke

Lozev

et al. 1998

Research in Nondestructive Evaluation

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A steel bridge hanger with three fatigue cracks was monitored for acoustic emission (AE) using combined source location, strain gauge monitoring, and waveform analysis. AE activities from all three cracks were clearly identified and classified as crack growth or noise signals using location, strain magnitude, position on strain cycle, and uniqueness of waveforms as the primary criteria. A vast majority of AE from the cracks was found to be due to crack face rubbing and the crushing of corrosion products between the crack faces while limited crack growth emissions were detected. Results from laboratory tests on A588 compact tension specinlens under variable-amplitude tension-tension fatigue loading were used to aid in interpreting AE data from the hanger. Crack growth AEs from these tests were detected only on overload cycles mostly above 92% of the maximum load while AE due to crack face rubbing occurred throughout the load cycle.

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Section: Laboratory Fatigue Testsmentioning

confidence: 99%

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Sison

Duke

Lozev

et al. 1998

Research in Nondestructive Evaluation

View full text Add to dashboard Cite

show abstract

Section: Laboratory Fatigue Testsmentioning

confidence: 99%

Analysis of Acoustic Emissions from a Steel Bridge Hanger

et al. 1998

View full text Add to dashboard Cite

A steel bridge hanger with three fatigue cracks was monitored for acoustic emission (AE) using combined source location, strain gauge monitoring, and waveform analysis. AE activities from all three cracks were clearly identified and classified as crack growth or noise signals using location, strain magnitude, position on strain cycle, and uniqueness of waveforms as the primary criteria. A vast majority of AE from the cracks was found to be due to crack face rubbing and the crushing of corrosion products between the crack faces while limited crack growth emissions were detected. Results from laboratory tests on A588 compact tension specimens under variable-amplitude tension-tension fatigue loading were used to aid in interpreting AE data from the hanger. Crack growth AEs from these tests were detected only on overload cycles mostly above 92% of the maximum load while AE due to crack face rubbing occurred throughout the load cycle.

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“…The analysis and the test of fatigue crack growth (FCG) under variable-amplitude loading in CT specimens have been studied in many papers by various researchers (Alawi, 1990; Moreno et al , 2003; Kalnaus et al , 2008; Alawi and Shaban, 1989). Alawi (1990) investigated the FCG under random loading in a CT specimen and compared the results with the experimental results, using the Wheeler model and cycle-by-cycle technique.…”

Section: Introductionmentioning

confidence: 99%

“…Kalnaus et al (2008) evaluated the behavior of AL6XN stainless steel in a laboratory using circular CT specimens and studied the effect of stress ratio, overload and load sequence on the FCG. Alawi and Shaban (1989) conducted a series of fatigue tests under random loading on CT specimens made of different steels to study FCG. Additionally, the effect of loading frequency was studied and the phenomena of retardation and acceleration of crack growth were clearly shown.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth reliability analysis under random loading

Salari

2019

IJSI

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Purpose The purpose of this paper is to investigate the fatigue crack growth (FCG) under random loading using analytical methods. Design/methodology/approach For this purpose, two methods of cycle-by-cycle technique and central limit theorem (CLT) were used. The Walker equation was used to consider the stress ratio effect on the FCG rate. In order to validate the results in three random loading group with different loading levels and bandwidths, the results of the analysis, such as the mean lifetime of the specimen and the average crack length were compared with the test results in terms of the number of loading cycles. Findings The comparison indicated a good agreement between the results of the analysis and the test. Further, the diagrams of reliability and the probability of failure of the specimen were obtained for each loading group and were compared together. Originality/value Applying the cycle-by-cycle and CLT methods for the calculation of fatigue reliability of a CT specimen under random loading by the Walker equation and comparing their results with each other is not observed in other researches. Also in this study, the effect of the loading frequency bandwidth on lifetime was studied.

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Fatigue crack growth under random loading

Cited by 8 publications

References 10 publications

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Fatigue crack growth reliability analysis under random loading

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