Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Hesseler, Jan; Baumgartner, J. Craig; Bleicher, Christoph

doi:10.1111/ffe.13519

Cited by 10 publications

(8 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect is extensively studied for single or periodic load cycles; however, it is also known that events with a series of large cycles may affect crack propagation. A typical example of such over-load effects for ships and offshore structures are storm events, see [21][22][23]. Fatigue design methods for OWTs are supposed to design against crack initiation, i.e., a through-thickness crack; however, for large plate thickness, this also includes a period of macro-crack growth, see [13].…”

Section: Fatigue Design Of Offshore Wind Turbine Support Structures I...mentioning

confidence: 99%

“…As the magnitude of loads due to ice action can be much higher than those related to wind and wave loading, differences in fatigue life under the combined wind, wave, and ice action are expected. This is exacerbated by the fact that similar effects are well-known from overloading events in tension and compression, e.g., during storms [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

et al. 2022

View full text Add to dashboard Cite

Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider the effects of ice loading and its stochastic nature on the fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented by loading the structure using a variable-amplitude loading (VAL) sequence. Typical offshore load spectra are developed for wave and wind loading. Thus, a combined VAL spectrum is developed for wind, wave, and ice action. To this goal, numerical models are used to simulate the dynamic ice-, wind-, and wave-structure interaction. The stress time-history at an exemplarily selected critical point in an offshore wind energy monopile support structure is extracted from the model and translated into a VAL sequence, which can then be used as a loading sequence for the fatigue assessment or fatigue testing of welded joints of offshore wind turbine support structures. This study presents the approach to determine combined load spectra and standardized time series for wind, wave, and ice action.

show abstract

Section: Fatigue Design Of Offshore Wind Turbine Support Structures I...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

et al. 2022

View full text Add to dashboard Cite

show abstract

“…This effect is extensively studied for single or periodically load cycles; however, it is also known that events with a series of large cycles may affect crack propagation. A typical example of such over-load effects for ships and offshore structures are storm events, see [21][22][23]. Fatigue design methods for OWTs are supposed to design against crack initiation, i.e., a through thickness crack; however, for large plate thickness, this also includes a period of macro-crack growth, see [13].…”

Section: Fatigue Design Of Offshore Wind Turbine Support Structures Including Ice Loading and Sub-zero Temperaturesmentioning

confidence: 99%

“…As the magnitude of loads due to ice action can be much higher than those related to wind and wave loading, differences in fatigue life under combined wind, wave, and ice action are expected. This is exacerbated by the fact that similar effects are well-known from overloading events in tension and compression, e.g., during storms [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Braun¹,

Dörner²,

Veer³

et al. 2021

Preprint

View full text Add to dashboard Cite

Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered, but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider effects of ice loading and its stochastic nature on fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented by loading the structure using a variable-amplitude loading (VAL) sequence. Typical offshore load spectra are developed for wave and wind loading. Thus, a combined VAL spectrum is developed for wind, wave, and ice action. To this goal, numerical models are used to simulate the dynamic ice-, wind-, and wave-structure interaction. The stress time-history at an exemplarily selected critical point in an offshore wind energy monopile support structure is extracted from the model and translated into a VAL sequence, which can then be used as a loading sequence for the fatigue assessment or fatigue testing of welded joints of offshore wind turbine support structures. This study presents the approach to determine combined load spectra and standardized time series for wind, wave, and ice action.

show abstract

“…Over the last years, the fabrication of heavy section DCI components (i.e., DCI components of weight on the order of tens of tons) for structural purposes has increased due to the favorable combination of both mechanical and technological properties and low production costs. As a matter of fact, DCI is widely used in the critical automotive parts (as crankshafts), big engine blocks, parts of hydraulic presses, canisters for nuclear waste storage, and wind turbines 2 . In order to give an order of magnitude of the material quantity involved in the production of heavy section components, a single wind turbine contains approximately 10–25 tons of DCI.…”

Section: Introductionmentioning

confidence: 99%

Effect of the porosity on the fatigue strength of metals

Vantadori

Ronchei

Scorza

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

In the present paper, a procedure for fatigue strength assessment of metals containing solidification defects is employed to analyze the fatigue behavior of a ductile cast iron (DCI) characterized by a relevant micro‐shrinkage porosity. The procedure implements (i) a statistical method deriving from extreme value theory, (ii) the ‐parameter model, and (iii) the multiaxial critical plane‐based criterion by Carpinteri et al. According to the above statistical method, both the distribution of defects and the return period are determined. More precisely, the return period is computed by also exploiting a relationship here proposed to optimize the accuracy of the procedure in terms of fatigue strength estimation. The great potential of the present procedure is that the defect content analysis (performed by means of a statistical method deriving from extreme value theory) can be easily performed using machine learning techniques.

show abstract

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Cited by 10 publications

References 23 publications

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading

Effect of the porosity on the fatigue strength of metals

Contact Info

Product

Resources

About