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Start Over Descriptor "Weldments" Journal materials & design
3 results on '"Weldments"'

1. Fatigue crack growth rates for offshore wind monopile weldments in air and seawater: SLIC inter-laboratory test results.

Author

Mehmanparast, Ali, Brennan, Feargal, and Tavares, Isaac

Subjects
*FATIGUE crack growth, *SEAWATER, *FATIGUE life, *FABRICATION (Manufacturing), *BIG data
Abstract

The majority of fatigue crack growth (FCG) data sets available on steels in air and seawater environments are several decades old and may not be appropriate for structural integrity assessment of offshore wind turbine foundations, which are fabricated using contemporary materials and welding technologies. Therefore, the SLIC joint industry project was formed to investigate the fatigue crack initiation and growth behaviour in offshore wind welded steel foundations. The FCG test data from the SLIC inter-laboratory (round robin) test programme have been analysed using a new proposed shape function solution and the results are presented and discussed. The obtained FCG trends in air and seawater environments have been compared with the recommended trends available in standards. The Paris-law constants and Δ K th values obtained from this programme can be used for defect assessment and remaining life prediction of offshore monopile weldments in air and seawater environments. The results from the SLIC project show that for a given value of Δ K the fatigue crack growth rate, da/dN , is on average around 2 times higher in seawater compared to air for the base metal and weldments. This factor of 2 in the seawater environment is almost half of the crack acceleration factor recommended by standards. [ABSTRACT FROM AUTHOR]

Published
2017
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2. Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments

Author

Nenad Gubeljak, M. Zrilic, Bashir Younise, Bojan Medjo, Aleksandar Sedmak, Meri Burzić, and Marko Rakin

Subjects
Mechanical heterogeneity, Ductile tearing, Materials science, Ductile fracture, Metallurgy, Weldments, Fracture mechanics, 02 engineering and technology, Welding, 021001 nanoscience & nanotechnology, law.invention, Stress (mechanics), 020303 mechanical engineering & transports, 0203 mechanical engineering, law, Ultimate tensile strength, Composite material, 0210 nano-technology, Material properties, Base metal, Joint (geology)
Abstract

The objective of this study is determination of the effect of mechanical heterogeneity on ductile crack initiation and propagation in weldments using micromechanical approach. Welded single-edge notched bend (SENB) specimens were experimentally and numerically analysed. Material properties of welded joint zones were estimated using a combined experimental and numerical procedure; strains on a smooth tensile specimen were determined using ARAMIS stereometric measuring system in order to obtain true stress – true strain curves. High-strength low-alloyed steel was used as base metal, in quenched and tempered condition. J – R curves and crack growth initiation values of fracture mechanics parameter were experimentally and numerically obtained for specimens with a pre-crack in the heat-affected zone (HAZ) and weld metal (WM). The complete Gurson model (CGM) was used in prediction of J – R curves and crack growth initiation. It is shown that the resistance to crack initiation and growth can be predicted using micromechanical analysis, and that the results are significantly affected by mechanical heterogeneity of the weldment.

Published
2012

3. Micromechanical analysis of mechanical heterogeneity effect on the ductile tearing of weldments

Author

Younise, Bashir, Sedmak, Aleksandar, Rakin, M., Gubeljak, Nenad, Međo, Bojan, Burzić, M., Zrilić, Milorad, Younise, Bashir, Sedmak, Aleksandar, Rakin, M., Gubeljak, Nenad, Međo, Bojan, Burzić, M., and Zrilić, Milorad

Abstract

The objective of this study is determination of the effect of mechanical heterogeneity on ductile crack initiation and propagation in weldments using micromechanical approach. Welded single-edge notched bend (SENB) specimens were experimentally and numerically analysed. Material properties of welded joint zones were estimated using a combined experimental and numerical procedure; strains on a smooth tensile specimen were determined using ARAMIS stereometric measuring system in order to obtain true stress - true strain curves. High-strength low-alloyed steel was used as base metal, in quenched and tempered condition. J-R curves and crack growth initiation values of fracture mechanics parameter were experimentally and numerically obtained for specimens with a pre-crack in the heat-affected zone (HAZ) and weld metal (WM). The complete Gurson model (CGM) was used in prediction of J-R curves and crack growth initiation. It is shown that the resistance to crack initiation and growth can be predicted using micromechanical analysis, and that the results are significantly affected by mechanical heterogeneity of the weldment.

Published
2012

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