Extension of the strain energy density method for fatigue assessment of welded joints to sub‐zero temperatures

Braun, Moritz; Fischer, Claas; Fricke, Wolfgang; Ehlers, Sören

doi:10.1111/ffe.13308

Cited by 17 publications

(12 citation statements)

References 66 publications

(131 reference statements)

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“…2.2 and Braun et al [42]. Alternatively, extensions of fatigue assessment methods-based on the micro-structural support effect hypothesis-that account for temperature effects on fatigue strength of welded joints on a sound physical basis are presented in [33,34,59].…”

Section: Discussionmentioning

confidence: 99%

“…For the two steels (S235 Fig. 2 Schematic presentation of fatigue test specimens with dimensions, extended from Braun et al [34] and taken from Braun [23] and S500) joined by flux-cored arc welding, a low toughness is observed in the middle of the weld metal. In contrast, a higher toughness is observed in the weld metal of the submerged arc-welded S355 joints compared to the base material.…”

Section: Materials and Test Specimensmentioning

confidence: 99%

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Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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Ships and offshore structures in Arctic environments are exposed to severe environmental actions and sub-zero temperatures. Thus, the design of such structures has to account for the Arctic environment and must be cost-efficient at the same time. A vital part of the design process is to ensure that fatigue-induced failure does not occur in the lifetime of the structure. While effects of high temperatures on material behavior are well covered in international standards and guidelines, there is no comprehensive guidance for sub-zero temperature fatigue strength assessment. Additionally, stress-life (S–N) test data of welded joints at sub-zero temperatures is particularly scarce. Hence, this study presents an extensive review of recent test results of various weld details tested in the range of − 50 to 20 °C. This data could build the basis for future considerations of temperature effects in fatigue design guidelines and recommendations. For this purpose, the fatigue test results are submitted to a rigorous statistically assessment—including a summary of the limitations of current design guidelines with respect to sub-zero temperature effects.

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Section: Discussionmentioning

confidence: 99%

Section: Materials and Test Specimensmentioning

confidence: 99%

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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“…The SED approach was applied in [114] for welded joints used in ships and offshore structures subjected to Arctic environments. In particular, the SED method was extended for the fatigue assessment of welded joints at sub-zero temperatures in [114], performing also fatigue tests of welded joints, made from normal and high-strength structural steel in the span of 20 • C to −50 • C. The obtained results were compared with results of studies on the SED-based assessment of notched components at high temperatures. Within this context a temperature modification function for SED was proposed by the authors for design purposes.…”

Section: Energy Approachmentioning

confidence: 99%

Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

Corigliano

Crupi²

2022

Metals

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Welded joints are widely used in many sectors and represent the main joining technique also in the marine industry. The welded joints are sites of high stress concentrations and are subject to severe conditions for the marine environment. The design of marine welded joints has to consider the effects from wave loads, ship motions and loading/unloading operations and corrosion effects. The aim of this scientific work is to discuss about the state of the art of the standards and the approaches for predicting the fatigue life of welded joints used for the marine industry. Several approaches are examined in order to provide an overview and highlight the advantages and limitations of each method. Furthermore, recent advances in welding of dissimilar metals and autonomous welding are considered.

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“…For example, at −20 • C, changes of fatigue strength of around 7% were determined from fatigue tests on different welded joints [30]. To this day, this effect is not considered in international standards and guidelines for fatigue design; however, there are studies that present approaches to consider temperature effects during fatigue assessment by means of nominal stress or local fatigue assessment methods, see [59][60][61]. Typically, ice loads are only expected during a few winter days and not randomly distributed between wind and wave cycles; nevertheless, randomly distributing loads is the typical approach to achieve conservative test results; (see [16,43].…”

Section: Consideration Of Temperature Effects On Fatigue Strengthmentioning

confidence: 99%

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

et al. 2022

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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.

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Extension of the strain energy density method for fatigue assessment of welded joints to sub‐zero temperatures

Cited by 17 publications

References 66 publications

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Review of Fatigue Assessment Approaches for Welded Marine Joints and Structures

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

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