Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting

Lillemäe-Avi, Ingrit; Liinalampi, Sami; Lehtimäki, Eero; Remes, Heikki; Lehto, Pauli; Romanoff, Jani; Ehlers, Sören; Niemelä, Ari

doi:10.1007/s40194-018-0638-y

Cited by 18 publications

(18 citation statements)

References 22 publications

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“…The treatment removed the defects on the surface and the corners. This is also shown in previous work (see, e.g., [2,4]).…”

Section: Discussionsupporting

confidence: 91%

“…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%

“…The influence of thermal cutting edges and their different qualities on fatigue strength has already been analyzed in several studies, for example, by Sperle [1], Remes et al [2], Stenberg et al [3], and Lillemäe et al [4]. Sperle carried out fatigue tests with a comprehensive range of steel grades (yield strengths from 240 to 900 MPa) on 6-mm-thick and 12-mmthick specimens.…”

Section: Recommended For Publication By Commission XIII -Fatigue Of Wmentioning

confidence: 99%

“…The investigation shows that posttreatments increase the fatigue strength of high-strength steel due to the reduced surface roughness and induced compressive residual stresses. The study was continued by Lillemäe [4], which shows additionally that 690 steel had significantly higher fatigue strength compared with 355 steel. Stenberg et al [3] investigated the influence of surface roughness on the fatigue strength in high-strength steels (S700 and S960) of 6-mm-thick and 16-mm-thick specimens.…”

Section: Recommended For Publication By Commission XIII -Fatigue Of Wmentioning

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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“…The treatment removed the defects on the surface and the corners. This is also shown in previous work (see, e.g., [2,4]).…”

Section: Discussionsupporting

confidence: 91%

“…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: Recommended For Publication By Commission XIII -Fatigue Of Wmentioning

confidence: 99%

Section: Recommended For Publication By Commission XIII -Fatigue Of Wmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

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“…However, some researchers have experimentally studied the effect of surface integrity on the fatigue strength of high-strength steels [16][17][18][19]. They have provided a comprehensive overview of the influence of these parameters on fatigue strength, although there is still an insufficient understanding of the effects of surface roughness, hardness, and residual stress on failure mechanism, crack initiation, and propagation under loading for high-strength steel materials.…”

Section: Introductionmentioning

confidence: 99%

Influences of Residual Stress, Surface Roughness and Peak-Load on Micro-Cracking: Sensitivity Analysis

Dastgerdi

Sheibanian

Remes

et al. 2021

Metals

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This paper provides further understanding of the peak load effect on micro-crack formation and residual stress relaxation. Comprehensive numerical simulations using the finite element method are applied to simultaneously take into account the effect of the surface roughness and residual stresses on the crack formation in sandblasted S690 high-strength steel surface under peak load conditions. A ductile fracture criterion is introduced for the prediction of damage initiation and evolution. This study specifically investigates the influences of compressive peak load, effective parameters on fracture locus, surface roughness, and residual stress on damage mechanism and formed crack size. The results indicate that under peak load conditions, surface roughness has a far more important influence on micro-crack formation than residual stress. Moreover, it is shown that the effect of peak load range on damage formation and crack size is significantly higher than the influence of residual stress. It is found that the crack size develops exponentially with increasing peak load magnitudes.

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Performance characterization of high-strength steel and quenched and tempered steels and their joints for structural applications

2020

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Although in the last decades the applicable regulations for the design of steel structures have been deeply improved accounting for modern design approaches and technologies, in a few industrial fields, concepts and formulations derived from centuries-old experience are even nowadays the governing rule. This very often limits the potential offered by the technological innovations in high-performance material, such as quenched and tempered (QT) steels. After having verified in the scientific literature, in the commercial one and in several open material databases that some main data necessary to the comprehensive characterization of QT steel used in building large metal structures are lacking, an extensive experimental campaign was undertaken to achieve an updated and specific fatigue strength characterization for certain types of materials. The aim is to overcome the strict requirements of current regulations on the application of both parent QT materials and welded homogeneous and heterogeneous joints between different steel strength. The experimental campaign allowed filling the knowledge gap as well as providing further understanding whether the use of high-strength steel is effective in the improvement of performances of large steel structures, whose fabrication procedures are typical of building sites rather than workshops. Their extensive application in current building practice is expected to be highly beneficial in terms of weight and costs.

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Fatigue strength of high-strength steel after shipyard production process of plasma cutting, grinding, and sandblasting

Cited by 18 publications

References 22 publications

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

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

Influences of Residual Stress, Surface Roughness and Peak-Load on Micro-Cracking: Sensitivity Analysis

Performance characterization of high-strength steel and quenched and tempered steels and their joints for structural applications

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