Fatigue strength of thermal cut edges—influence of ISO 9013 quality groups

Diekhoff, Paul; Hensel, Jonas; Nitschke–Pagel, Thomas; Dilger, Klaus

doi:10.1007/s40194-018-00697-7

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…It implicates a relatively increased hardening compared with the base material from 10 to 170%. The results shown are comparable to previous work [2,4,10].…”

Section: Hardness Measurementssupporting

confidence: 91%

“…ISO 9013 classifies the quality of the cut edges in four different groups. According to these quality groups, the ISO 9013 has a weak connection to fatigue strength, also seen in [3,10]. In order to make a prediction of the fatigue performance, the standard has to be specified and the cutting process as well as the steel strength should be considered.…”

Section: Discussionmentioning

confidence: 99%

“…Fatigue strength of different thermal cut edges of two different steel grades with a minimum yield strength of 355 and 690 MPa was analyzed. The uniaxial test specimen used in this study was similar to previous work in [10] and is shown in Fig. 2.…”

Section: Specimensmentioning

confidence: 99%

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Investigation on fatigue strength of cut edges produced by various cutting methods for high-strength steels

et al. 2020

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Due to the interest in effective light steel constructions, high-strength steels have gained importance. Different thermal cutting processes are frequently used in the metal processing industry. Besides the weld seams, free cutting edges gain technical and economic relevance as locations for potential fatigue cracks. In this investigation, fatigue tests were carried out on 8-mm-thick samples of S355M and S690Q steels at a stress ratio of R = 0.1. The cutting methods used were oxygen, plasma, laser, and waterjet cutting. Quality improvement methods, like shot peening, grinding, and cutting speed reduction, were applied for some series. The surface roughness was measured to classify the specimens into quality groups according to ISO 9013. The cut edge condition was also characterized by hardness and residual stress measurements. The investigation shows that all tested series exceed the FAT100 class and can be classified in FAT125. Specimens ranged in quality group 2 of ISO 9013 according to the roughness achieve FAT140 regardless of cutting technology or material. According to the ISO 9013, most of the specimens are classified in the quality group 2 and group 3. Fatigue strength results are significantly different in one quality group. No prediction can be made. ISO 9013 has a weak connection to fatigue strength. Quality improvement methods have a significant influence on the fatigue strength and can increase it. Due to reduced cutting speeds, the roughness decreases also. It results in an increase of the fatigue strength in all tested series in this study. In order to make a prediction of the fatigue performance, the standard has to be specified and the cutting process as well as the steel strength should be considered.

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“…It implicates a relatively increased hardening compared with the base material from 10 to 170%. The results shown are comparable to previous work [2,4,10].…”

Section: Hardness Measurementssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

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Investigation on fatigue strength of cut edges produced by various cutting methods for high-strength steels

et al. 2020

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“…Steel plates had a thickness of 20 mm. The geometry of the specimens was similar to previous work [6]. The samples were 394 mm long, and in the center, the specimens had a parallel length of 20 mm with a width of 38 mm in the critical cross section (Fig.…”

Section: Specimensmentioning

confidence: 93%

“…Since many designs require special component shapes, they are usually separated in the industry by thermal cutting processes such as laser beam cutting, oxy-fuel cutting, water jet cutting, or plasma cutting. Depending on the process parameters of the different cutting methods, the cut edges have a high or inferior quality, which influences the fatigue strength [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence of competing notches on the fatigue strength of cut plate edges

et al. 2021

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Material fatigue is one of the elementary causes of damage in steel construction besides corrosion and abrasion. Design recommendations require that weld seams are placed in less stressed areas due to the crack-sensitive nature of the welded areas. As a result, unwelded areas of the components such as free cut plate edges gain technical and economic relevance as locations for potential fatigue cracks. In the metal processing industry, different thermal cutting processes are frequently used. During the process, unwanted boundary conditions can lead to undesired cuts in the component geometry during the cutting process. These process dysfunctions lead to incorrect components and to rejects. This article presents results of fatigue test data of oxy-fuel thermal cut edges of defect-free and faulty repair-welded samples to investigate the influence of competing notches on the cut edge. Specimens are made from construction steels S355N and S690Q of a 20-mm-thick plate. The presented data shows that the fatigue strength of the damaged cut edges can be recovered by the repair procedure and does not show any reduction of the fatigue strength due to the determined pores or other metallurgical notches of the repaired section.

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