The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Takafumi Ohmune - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Behaviour of friction stir welds without neither welding flash nor flaw in several aluminium alloys
International Journal of Fatigue, 2009Co-Authors: Yoshihiko Uematsu, Keiro Tokaji, Yasunari Tozaki, Hideaki Shibata, Takafumi OhmuneAbstract:Fully reversed axial Fatigue tests have been performed in order to investigate the Fatigue Behaviour in the friction stir welds of 1050-O, 5083-O, 6061-T6 and 7075-T6 aluminium alloys. In all alloys, the comparative studies on the Fatigue Behaviour between parent materials and welds have been done. The Fatigue Behaviour of the welds was sensitive to the microstructures such as stir zone, thermo-mechanically affected zone and heat affected zone. The Fatigue strengths of the welds are comparative to or lower than those of the parent materials. The observed Fatigue strengths were discussed based on the microstructure and crack initiation Behaviour.
Yoshihiko Uematsu - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Behaviour of Pre-Strained Type 316 Stainless Steel
Fracture of Nano and Engineering Materials and Structures, 2020Co-Authors: Masayuki Akita, Masaki Nakajima, Keiro Tokaji, Yoshihiko UematsuAbstract:Type 316 stainless steel has excellent corrosion resistance, which has been widely used for machine components and structures. Materials are usually subjected to plastic deformation by processing or forming. Therefore, it is very important to understand the effect of pre-strain on Fatigue Behaviour (Radhakrishnan and Baburamani [1], Yokotsuka and Ikegami [2]). The present paper describes the Fatigue Behaviour of pre-strained 316 stainless steel. Rotating bending Fatigue tests have been performed using specimens subjected to tensile pre-strains and the Fatigue Behaviour was discussed.
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Fatigue Behaviour of Friction Stir Welded 6061-T6 Aluminium Alloy
Fracture of Nano and Engineering Materials and Structures, 2020Co-Authors: Yoshihiko Uematsu, Keiro Tokaji, Yasunari Tozaki, Hideaki ShibataAbstract:Friction stir welding (FSW) is a recently developed solid state welding method, and now being used increasingly for joining aluminium alloys. However, the Fatigue Behaviour of FSW joints with relatively complicated microstructure is still unclear. In this study, Fatigue Behaviour of FSW joints of 6061-T6 aluminium alloy was investigated. The 6061-T6 plates were joined with welding speeds of 100 and 200 mm/min and the rotation speeds of tool of 1200 and 1800 rpm. Fatigue tests were conducted at stress ratio R = −1 under axial loading.
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Fatigue Behaviour of friction stir welds without neither welding flash nor flaw in several aluminium alloys
International Journal of Fatigue, 2009Co-Authors: Yoshihiko Uematsu, Keiro Tokaji, Yasunari Tozaki, Hideaki Shibata, Takafumi OhmuneAbstract:Fully reversed axial Fatigue tests have been performed in order to investigate the Fatigue Behaviour in the friction stir welds of 1050-O, 5083-O, 6061-T6 and 7075-T6 aluminium alloys. In all alloys, the comparative studies on the Fatigue Behaviour between parent materials and welds have been done. The Fatigue Behaviour of the welds was sensitive to the microstructures such as stir zone, thermo-mechanically affected zone and heat affected zone. The Fatigue strengths of the welds are comparative to or lower than those of the parent materials. The observed Fatigue strengths were discussed based on the microstructure and crack initiation Behaviour.
Nadja Oneschkow - One of the best experts on this subject based on the ideXlab platform.
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Compressive Fatigue Behaviour of high-strength concrete in a dry and wet environment
Construction and Building Materials, 2020Co-Authors: Nadja Oneschkow, Julian Hümme, Ludger LohausAbstract:Abstract Fatigue verification becomes decisive for the design of slender structures of high-strength concretes. But there is a lack of knowledge regarding the Fatigue Behaviour, especially for wet environment. Only limited investigations are documented in literature. In addition, these investigations differ considerably regarding storage conditions and, therefore, are hard to compare. The Fatigue Behaviour of a high-strength concrete has been investigated at the Institute for Building Materials Science, Leibniz University Hannover, over the last years regarding different influences. In this paper, results of two research projects are comparatively analysed, focusing on the effect of surrounding water on the numbers of cycles to failure of a high-strength concrete. Thereby, additional influences of loading frequency and size effect are considered. The results clearly demonstrate that the Fatigue resistance expressed by the numbers of cycles to failure is reduced by wet environment, meaning storing and testing submerged under water. In addition, indications were found that the moisture content of the high-strength concrete also affects the Fatigue Behaviour.
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Fatigue Behaviour of high strength concrete with respect to strain and stiffness
International Journal of Fatigue, 2016Co-Authors: Nadja OneschkowAbstract:Abstract The Fatigue Behaviour of concrete, and especially of high-strength concrete, has become more important for the design of structures due to more slender structures, which are more sensitive to Fatigue loading, or due to wind turbines, which are typically exposed to high-Fatigue loading. The Fatigue Behaviour of a high-strength concrete was investigated within a research project with respect to the influence of maximum stress level, loading frequency and waveform. The investigations were focused on low-cycle-Fatigue. The influence on numbers of cycles to failure and on the developments of strain and stiffness were systematically analysed. Selected results are presented in this paper. For the three influences investigated the results show certain systematologies in the change of strain and stiffness parameters with respect to the change in number of cycles to failure.
Keiro Tokaji - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Behaviour of Pre-Strained Type 316 Stainless Steel
Fracture of Nano and Engineering Materials and Structures, 2020Co-Authors: Masayuki Akita, Masaki Nakajima, Keiro Tokaji, Yoshihiko UematsuAbstract:Type 316 stainless steel has excellent corrosion resistance, which has been widely used for machine components and structures. Materials are usually subjected to plastic deformation by processing or forming. Therefore, it is very important to understand the effect of pre-strain on Fatigue Behaviour (Radhakrishnan and Baburamani [1], Yokotsuka and Ikegami [2]). The present paper describes the Fatigue Behaviour of pre-strained 316 stainless steel. Rotating bending Fatigue tests have been performed using specimens subjected to tensile pre-strains and the Fatigue Behaviour was discussed.
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Fatigue Behaviour of Friction Stir Welded 6061-T6 Aluminium Alloy
Fracture of Nano and Engineering Materials and Structures, 2020Co-Authors: Yoshihiko Uematsu, Keiro Tokaji, Yasunari Tozaki, Hideaki ShibataAbstract:Friction stir welding (FSW) is a recently developed solid state welding method, and now being used increasingly for joining aluminium alloys. However, the Fatigue Behaviour of FSW joints with relatively complicated microstructure is still unclear. In this study, Fatigue Behaviour of FSW joints of 6061-T6 aluminium alloy was investigated. The 6061-T6 plates were joined with welding speeds of 100 and 200 mm/min and the rotation speeds of tool of 1200 and 1800 rpm. Fatigue tests were conducted at stress ratio R = −1 under axial loading.
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Microstructure Dependence of Fatigue Behaviour in Beta Ti-22V-4Al Alloy
2013Co-Authors: Keiro Tokaji, Kohji Ohya, Hiroyasu KariyaAbstract:The effects of microstructure on Fatigue Behaviour in beta Ti-22V-4Al alloyare studied. A wide variety of microstructures were prepared with heat treatment, whichwere classified into three groups, as-solution treated materials, solution treated and agedmaterials, and duplex-aged materials. Rotary bending Fatigue tests have been conductedusing smooth specimens in laboratory air at ambient temperature. Based on obtainedexperimental results, the role of microstructural variables such as grain size and alphaprecipitates in Fatigue Behaviour is discussed. Particular attention is paid to subsurfacecrack initiation.
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Fatigue Behaviour of friction stir welds without neither welding flash nor flaw in several aluminium alloys
International Journal of Fatigue, 2009Co-Authors: Yoshihiko Uematsu, Keiro Tokaji, Yasunari Tozaki, Hideaki Shibata, Takafumi OhmuneAbstract:Fully reversed axial Fatigue tests have been performed in order to investigate the Fatigue Behaviour in the friction stir welds of 1050-O, 5083-O, 6061-T6 and 7075-T6 aluminium alloys. In all alloys, the comparative studies on the Fatigue Behaviour between parent materials and welds have been done. The Fatigue Behaviour of the welds was sensitive to the microstructures such as stir zone, thermo-mechanically affected zone and heat affected zone. The Fatigue strengths of the welds are comparative to or lower than those of the parent materials. The observed Fatigue strengths were discussed based on the microstructure and crack initiation Behaviour.
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Effect Of Carburizing On Fatigue Behaviour InA Type 316 Austenitic Stainless Steel
WIT transactions on engineering sciences, 2007Co-Authors: Keiro Tokaji, Masayuki AkitaAbstract:The effect of carburizing on Fatigue Behaviour of smooth and notched specimens and corrosion Fatigue Behaviour was studied in a type 316 austenitic stainless steel. The Fatigue strength of the smooth specimens was considerably increased by carburizing and the specimens with a thick case exhibited longer Fatigue lives than the specimens with a thin case. The Fatigue strength of the notched specimens was also increased by carburizing and the extent of increase in Fatigue strength decreased with increasing stress concentration factor and then saturated. A slight increase in notch sensitivity by carburizing was seen. In 3%NaCl aqueous solution, the carburized smooth specimens showed no reduction in Fatigue strength, indicating the excellent corrosion resistance of the carburized case.
B I G Barr - One of the best experts on this subject based on the ideXlab platform.
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an overview of the Fatigue Behaviour of plain and fibre reinforced concrete
Cement & Concrete Composites, 2004Co-Authors: B I G BarrAbstract:The paper provides a general overview of recent developments in the study of the Fatigue Behaviour of plain and fibre reinforced concrete (FRC). The Fatigue performance of plain concrete and FRC, as reported in the literature, is compared in order to quantify the influence of fibre inclusion on Fatigue Behaviour. Despite the conflicting information regarding the Fatigue Behaviour of concrete reported in the literature, the majority of researchers show that the inclusion of fibres can benefit the Fatigue performance of concrete.
