Fatigue strength of blast cleaned and stress relief annealed butt joints made of structural steel S355J2+N for offshore wind support structures

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-19 DOI:10.1016/j.ijfatigue.2024.108711

Andreas Gericke , Thomas von Borstel , Göran Gabriel , Malin Strandberg , Knuth-Michael Henkel

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引用次数: 0

Abstract

The effects of blast cleaning (BC) and stress relief annealing (SRA) on butt joints were investigated. BC leads to a significant increase in fatigue strength due to insertion of compressive residual stresses and cold work hardening at the surface. Additional SRA leads to a decrease of fatigue strength down to the as-welded state. It is shown that the SRA not only leads to a decrease of compressive residual stresses but also to a decrease of cold work hardness at the surface. This shows that SRA is not an appropriate method to show the effect of the reduction of residual stresses in service of mechanical post weld treated weld seams since surface hardness is decreased as well. SRA of as-welded specimens did not lead to an increase in fatigue strength. It is shown that compressive residual stresses and surface hardness are stable under high tensile loads and high cycle numbers. Fatigue tests were accompanied by strain gauge measurements to identify the structural hot-spot stresses in correlation to axial and angular misalignments. A parametric FE model was used to calculate the stress concentration factors and compared to the measured stresses. Angular misalignment shows good correlation with stress increase compared to nominal stresses.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.