The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Yimu Guo - One of the best experts on this subject based on the ideXlab platform.
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high cycle fatigue damage measurement based on electrical resistance change considering variable electrical resistivity and uneven damage
International Journal of Fatigue, 2004Co-Authors: Binxiang Sun, Yimu GuoAbstract:Abstract The definition of damage variable based on electrical resistance changes was investigated. Under the hypothesis of a current-conducting Section equivalent to a load-Bearing Section, the fatigue damage evolution may be represented effectively. For rotary bending high-cycle fatigue test, the formula of fatigue damage measurement considering uneven damage distribution and variable electrical resistivity was developed, which is the hypergeometric function. The analysis shows that in the range of damage 0–0.6, the formula is approximate to damage measurement based on electrical resistance changes due to uniform damage and constant electrical resistivity. High-cycle fatigue damage measurement for common structural steels was performed, and the comparison of experimental data with the predictions shows agreement.
Binxiang Sun - One of the best experts on this subject based on the ideXlab platform.
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high cycle fatigue damage measurement based on electrical resistance change considering variable electrical resistivity and uneven damage
International Journal of Fatigue, 2004Co-Authors: Binxiang Sun, Yimu GuoAbstract:Abstract The definition of damage variable based on electrical resistance changes was investigated. Under the hypothesis of a current-conducting Section equivalent to a load-Bearing Section, the fatigue damage evolution may be represented effectively. For rotary bending high-cycle fatigue test, the formula of fatigue damage measurement considering uneven damage distribution and variable electrical resistivity was developed, which is the hypergeometric function. The analysis shows that in the range of damage 0–0.6, the formula is approximate to damage measurement based on electrical resistance changes due to uniform damage and constant electrical resistivity. High-cycle fatigue damage measurement for common structural steels was performed, and the comparison of experimental data with the predictions shows agreement.
A Molinari - One of the best experts on this subject based on the ideXlab platform.
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the tensile properties of a powder metallurgy cu mo ni diffusion bonded steel sintered at different temperatures
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2019Co-Authors: Toledo Dos D Santos, A Salemi, Ilaria Cristofolini, A MolinariAbstract:Abstract The increase of the sintering temperature from 1120 °C up to 1280 °C of a 0.2%C Cu–Mo–Ni diffusion bonded steels with 6.9 g/cm3 and 7.2 g/cm3 green density slightly increases sintered density and improves the pore morphology. The fraction of the load Bearing Section increases consequently. Moreover, high sintering temperature enhances the compositional homogeneity of the metallic matrix, and the microstructure evolves from a mixture of ferrite, pearlite, bainite, martensite and Ni-austenite to a bainitic/martensitic microstructure, with a decreasing amount of the Ni-austenite. Tensile strength and ductility increase with the sintering temperature. The paper clearly demonstrates the role of the pore morphology on the mechanical properties that are therefore better correlated to the fraction of the load Bearing Section than to density. It also highlights that sintering temperature may represent a solution to enhance mechanical properties of porous sintered steels as an alternative to the increase in green density.
Toledo Dos D Santos - One of the best experts on this subject based on the ideXlab platform.
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the tensile properties of a powder metallurgy cu mo ni diffusion bonded steel sintered at different temperatures
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2019Co-Authors: Toledo Dos D Santos, A Salemi, Ilaria Cristofolini, A MolinariAbstract:Abstract The increase of the sintering temperature from 1120 °C up to 1280 °C of a 0.2%C Cu–Mo–Ni diffusion bonded steels with 6.9 g/cm3 and 7.2 g/cm3 green density slightly increases sintered density and improves the pore morphology. The fraction of the load Bearing Section increases consequently. Moreover, high sintering temperature enhances the compositional homogeneity of the metallic matrix, and the microstructure evolves from a mixture of ferrite, pearlite, bainite, martensite and Ni-austenite to a bainitic/martensitic microstructure, with a decreasing amount of the Ni-austenite. Tensile strength and ductility increase with the sintering temperature. The paper clearly demonstrates the role of the pore morphology on the mechanical properties that are therefore better correlated to the fraction of the load Bearing Section than to density. It also highlights that sintering temperature may represent a solution to enhance mechanical properties of porous sintered steels as an alternative to the increase in green density.
Jacques Verniers - One of the best experts on this subject based on the ideXlab platform.
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shallow marine lower and middle miocene deposits at the southern margin of the north sea basin northern belgium dinoflagellate cyst biostratigraphy and depositional history
Geological Magazine, 2000Co-Authors: Stephen Louwye, J De Coninck, Jacques VerniersAbstract:Detailed dinoflagellate cyst analysis of the Lower–Middle Miocene Berchem Formation at the southernmost margin of the North Sea Basin (northern Belgium) allowed a precise biostratigraphical positioning and a reconstruction of the depositional history. The two lower members of the formation (Edegem Sands and decalcified Kiel Sands) are biostratigraphically regarded as one unit since no significant break within the dinocyst assemblages is observed. The base of this late (or latest) Aquitanian–Burdigalian unit coincides with sequence boundary Aq3/Bur1 as defined by Hardenbol and others, in work published in 1998. A hiatus at the Lower–Middle Miocene transition separates the upper member (the Antwerpen Sands) from the underlying member. The greater part of the Antwerpen Sands were deposited in a Langhian (latest Burdigalian?)–middle Serravallian interval. The base of this unit coincides with sequence boundary Bur5/Lan1. Biostratigraphical correlation points to a diachronous post-depositional decalcification within the formation since parts of the decalcified Kiel Sands can be correlated with parts of the calcareous fossil-Bearing Section, up to now interpreted as Antwerpen Sands. The dinoflagellate cyst assemblages are dominated by species with a inner neritic preference, although higher numbers of oceanic taxa in the upper part of the formation indicate incursions of oceanic watermasses into the confined depositional environment of the southern North Sea Basin.