Effects of fatigue damage on the high strain-rate performance of DH36 steel

An experimental investigation has been undertaken to determine the effects of fatigue on the high strain-rate material properties of high-performance steel used in modern naval vessel structures. A novel methodology to conduct tensile testing at low and high strain-rates on fatigued specimens was de...

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Bibliographic Details
Published inShips and offshore structures Vol. 17; no. 3; pp. 646 - 660
Main Authors Clayton, Daniel K., Saleh, Michael, Ferguson, Tom Mitchell, Ojeda, Roberto
Format Journal Article
LanguageEnglish
Published Cambridge Taylor & Francis 04.03.2022
Taylor & Francis Ltd
Subjects
Blast Loading
Decision making
Defence craft
DH36
Fatigue
Fatigue failure
Fatigue tests
High cycle fatigue
Iron and steel industry
Material properties
Metal fatigue
Microstructural analysis
Microstructure
Naval Steel
Naval vessels
Properties
Shipbuilding
SHTB
Steel
Steel making
Strain rate sensitivity
Structural steels
Tensile tests
Testing
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Summary:An experimental investigation has been undertaken to determine the effects of fatigue on the high strain-rate material properties of high-performance steel used in modern naval vessel structures. A novel methodology to conduct tensile testing at low and high strain-rates on fatigued specimens was developed. A bespoke Split Hopkinson's Tension Bar clamping arrangement was designed to undertake the necessary high strain-rate testing of flat dog-bone specimens. Analysis of the microstructure of the specimens was performed alongside a comparison on the strain-rate sensitivity of the tested DH36 steel against other literature sources. Testing revealed no statistically significant effect of high cycle fatigue at high strain-rate as determined by a two-sample t-test, but revealed a possible effect on quasi-static material properties. The findings of this novel comparison between fatigued and virgin material properties of shipbuilding steel provides decision-makers and researchers with an understanding on the effect of fatigue on high strain-rate material properties.
ISSN:1744-5302
1754-212X
DOI:10.1080/17445302.2020.1861707