Investigating the fatigue behaviour of small scale and real size HFMI-treated components of high strength steels

Gkatzogiannis, Stefanos; Schubnell, Jan; Knoedel, Peter; Farajian, Majid; Ummenhofer, Thomas; Luke, Michael

doi:10.1016/j.engfailanal.2021.105300

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…A method is proposed and tested in this study for the probabilistic fatigue assessment of welded joints based on their individual geometrical parameters using a combination of methods from previous studies. 17,20,27,28 The geometrical parameters were evaluated from 3D surface scans of 26 test series from previous studies [30][31][32][33][34][35][36] of welded joints.…”

Section: Discussionmentioning

confidence: 99%

“…The geometrical parameters and fatigue test results taken from previous studies [30][31][32][33][34][35][36] and other unpublished investigations are summarized in Table 1. These data contain 390 single fatigue tests with four different types of welded joints: single V-butt joints, double V-butt joints, cruciform joints, and T-joints.…”

Section: Materials and Specimensmentioning

confidence: 99%

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Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Schubnell,

Konidena,

Jung

et al. 2023

Fatigue Fract Eng Mat Struct

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Welded joints show large variation of the weld toe geometry along the weld seam, which is one important reason for the comparably large scatter in fatigue life. Therefore, it is crucial to take the local geometry at the weld toe into account, to reduce the conservatism in fatigue assessment of welded joints. This study is based on the IBESS procedure for the calculation of the fatigue strength, whereby the evaluation of local geometrical parameters is carried out by means of 3D surface scans. The approach is validated against 26 fatigue test series. The fatigue life is in general overpredicted, whereas good agreement is achieved for high stress ratio ( ). A sensitivity analysis conducted with IBESS shows that weld toe radii ρ < 2 mm and flank angle α < 30° have a significant influence on the calculated fatigue strength. In contrast to this, no strong correlation between and the fatigue strength was determined experimentally in this study.

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Section: Discussionmentioning

confidence: 99%

Section: Materials and Specimensmentioning

confidence: 99%

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Schubnell,

Konidena,

Jung

et al. 2023

Fatigue Fract Eng Mat Struct

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Corrosion Effect on the Efficiency of High-Frequency Mechanical Impact Treatment in Enhancing Fatigue Strength of Welded Steel Structures

al-Karawi

2022

J. of Materi Eng and Perform

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Fatigue and corrosion are two material degradation phenomena that occur in welded steel structures. High-frequency mechanical impact (HFMI) treatment is a post-weld treatment method that aims to increase the fatigue strength of welded details. This paper investigates the effect of steel corrosion on the efficiency of this method in enhancing fatigue resistance. More than 150 fatigue test results on corroded and HFMI-treated welded details are collected from several research articles and analyzed for both transverse welded attachment and butt-welded details. The efficiency of HFMI treatment decreases in corroded details as the corrosion level increases. However, HFMI treatment is found to have a high potential in prolonging the fatigue life, even in circumstances of an extremely corrosive environment.

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Quantifying the intensity of high-frequency mechanical impact treatment

Schubnell,

Hanji,

Tateishi

et al. 2024

Weld World

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High-frequency mechanical impact (HFMI) is a user-friendly and efficient mechanical post-weld treatment method, and the achieved fatigue life improvement is statistically proved and is attributed to HFMI-induced compressive residual stresses amongst other effects. Several studies have shown in the past that the process parameters (treatment time and working speed) have an influence on the stress state introduced by the HFMI treatment. Thus far, however, only device-specific quantitative recommendation for the HFMI treatment exists based on the instructions of each HFMI device manufacturer. It is not clear if a certain treatment time for a given intensity leads to optimum results regarding the enhanced fatigue life and the treatment parameters of the several HFMI devices cannot be directly compared with each other. For these reasons, a universal and simple definition of the HFMI treatment’s intensity based on the kinetic energy of the HFMI pin was used to quantitatively correlate the HFMI-induced compressive residual stress with the HFMI-process parameters for two different HFMI devices: pneumatical impact treatment (PIT) and high-frequency impact treatment (HiFIT). To this purpose, data from former studies of HFMI-treated base material and welded specimens are revaluated. It is shown, that the compressive residual stresses show only slight changes after reaching a threshold value of the applied kinetic energy ($$\approx$$ ≈ 50 to 100 J/mm). This energy-based approach for the quantification of the treatment intensity was also used for a case study with PIT- and HiFIT-treated transverse stiffeners with different treatment intensities (2 J/mm and 7 J/mm). A high influence of the treatment intensity on the residual stress state was determined.

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Investigating the fatigue behaviour of small scale and real size HFMI-treated components of high strength steels

Cited by 8 publications

References 19 publications

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Approach for the probabilistic fatigue assessment of welded joints based on the local geometry of the weld seam

Corrosion Effect on the Efficiency of High-Frequency Mechanical Impact Treatment in Enhancing Fatigue Strength of Welded Steel Structures

Quantifying the intensity of high-frequency mechanical impact treatment

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