The Experts below are selected from a list of 4638021 Experts worldwide ranked by ideXlab platform
Jeong Whan Yoon - One of the best experts on this subject based on the ideXlab platform.
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correlation of the maximum shear stress with micro mechanisms of ductile fracture for metals with high strength to weight Ratio
International Journal of Mechanical Sciences, 2018Co-Authors: Qi Chao, Jeong Whan Yoon, Junghan SongAbstract:Abstract Mechanisms of ductile fracture are investigated experimentally in a wide range of loading conditions from compressive upsetting to the balanced biaxial tension for two metals with high strength-to-density Ratio of DP980 (t1.2) steel sheets and a bulk aluminum alloy of AA7075. Specimens are carefully designed to achieve various loading conditions from shear at low stress triaxiality to the balanced biaxial tension at high stress triaxiality for DP980, while both tensile and compressive tests are conducted for AA7075. Fractured specimen surfaces are analyzed macroscopically focusing on their relations with the maximum shear stress. It is observed that all the specimens tend to fail along the direction of the maximum shear stress in various loading states of plane strain compression, uniaxial compression, shear, uniaxial tension, plane strain tension and the balanced biaxial tension. Scanning electron microscope analyses of fracture surfaces are also conducted to explore the underlying mechanism of void coalescence since coalescence of voids is viewed as the last step of ductile fracture after nucleation and growth of voids. It is noted that fractured voids elongate along the direction of the maximum shear stress for all specimens with the stress triaxiality ranging from about −0.57 in compression to 0.67 in the balanced biaxial tension. The experiments of DP980 and AA7075 reveal that ductile fracture takes place along the direction of the maximum shear stress in the wide loading conditions of compressive upsetting, shear, uniaxial tension, plane strain tension and the balanced biaxial tension with stress triaxiality below 0.67. Thus, ductile fracture is expected to be governed by the maximum shear stress in these wide loading conditions of compression, shear and tension. It is suggested that effect of the maximum shear stress must be correctly coupled in modeling of ductile fracture in these loading conditions with uncoupled and coupled ductile fracture criteria.
Junghan Song - One of the best experts on this subject based on the ideXlab platform.
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correlation of the maximum shear stress with micro mechanisms of ductile fracture for metals with high strength to weight Ratio
International Journal of Mechanical Sciences, 2018Co-Authors: Qi Chao, Jeong Whan Yoon, Junghan SongAbstract:Abstract Mechanisms of ductile fracture are investigated experimentally in a wide range of loading conditions from compressive upsetting to the balanced biaxial tension for two metals with high strength-to-density Ratio of DP980 (t1.2) steel sheets and a bulk aluminum alloy of AA7075. Specimens are carefully designed to achieve various loading conditions from shear at low stress triaxiality to the balanced biaxial tension at high stress triaxiality for DP980, while both tensile and compressive tests are conducted for AA7075. Fractured specimen surfaces are analyzed macroscopically focusing on their relations with the maximum shear stress. It is observed that all the specimens tend to fail along the direction of the maximum shear stress in various loading states of plane strain compression, uniaxial compression, shear, uniaxial tension, plane strain tension and the balanced biaxial tension. Scanning electron microscope analyses of fracture surfaces are also conducted to explore the underlying mechanism of void coalescence since coalescence of voids is viewed as the last step of ductile fracture after nucleation and growth of voids. It is noted that fractured voids elongate along the direction of the maximum shear stress for all specimens with the stress triaxiality ranging from about −0.57 in compression to 0.67 in the balanced biaxial tension. The experiments of DP980 and AA7075 reveal that ductile fracture takes place along the direction of the maximum shear stress in the wide loading conditions of compressive upsetting, shear, uniaxial tension, plane strain tension and the balanced biaxial tension with stress triaxiality below 0.67. Thus, ductile fracture is expected to be governed by the maximum shear stress in these wide loading conditions of compression, shear and tension. It is suggested that effect of the maximum shear stress must be correctly coupled in modeling of ductile fracture in these loading conditions with uncoupled and coupled ductile fracture criteria.
T Tanski - One of the best experts on this subject based on the ideXlab platform.
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study of selected properties of magnesium alloy az91 after heat treatment and forming
Journal of Materials Processing Technology, 2004Co-Authors: L Cižek, Miroslav Greger, Libor Pawlica, L A Dobrzanski, T TanskiAbstract:Abstract Magnesium and magnesium alloys are primarily used in aeronautical and automobile industry in large variety of structural characteristics because of their favorable combination of tensile strength (160–365 MPa), elastic modulus (45 GPa), and low density (1740 kg/m3), which is two-thirds that of aluminum. Magnesium alloys have high Strength-to-Weight Ratio (tensile strength/density), comparable to those of other structural metals. Application, structure and mechanical properties of selected magnesium alloys were investigated.
L Cižek - One of the best experts on this subject based on the ideXlab platform.
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study of selected properties of magnesium alloy az91 after heat treatment and forming
Journal of Materials Processing Technology, 2004Co-Authors: L Cižek, Miroslav Greger, Libor Pawlica, L A Dobrzanski, T TanskiAbstract:Abstract Magnesium and magnesium alloys are primarily used in aeronautical and automobile industry in large variety of structural characteristics because of their favorable combination of tensile strength (160–365 MPa), elastic modulus (45 GPa), and low density (1740 kg/m3), which is two-thirds that of aluminum. Magnesium alloys have high Strength-to-Weight Ratio (tensile strength/density), comparable to those of other structural metals. Application, structure and mechanical properties of selected magnesium alloys were investigated.
Fernando Navarro Valdivielso - One of the best experts on this subject based on the ideXlab platform.
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Effect of Strength-to-Weight Ratio on the time taken to perform a sled-towing exercise
Journal of Human Sport and Exercise, 2017Co-Authors: María Asunción Martínez-valencia, Nicholas P. Linthorne, José María González-ravé, Pedro E. Alcaraz, Fernando Navarro ValdivielsoAbstract:This research was supported by a Student Research Grant from the University of Castilla La Mancha (FPI grant, code PRINCET 02/11/2007) and by a grant from the Spanish Ministry of Economy and Competitiveness (DEP2011-28727).
