Documents disponibles écrits par cet auteur

Correlation between electrochemical impedance and current distribution of carbon steel under organic coating / D. Kong in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 475–480 Titre : Correlation between electrochemical impedance and current distribution of carbon steel under organic coating Type de document : texte imprimé Auteurs : D. Kong, Auteur ; Y. Wang, Auteur ; W. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 475–480 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Current  distribution;  EIS;  organic  coating;  wire  beam  electrode Résumé : The current distribution of carbon steel beneath intact organic coating exposed to 3.5% NaCl solution was investigated by the wire beam electrode (WBE) method. The electrochemical impedance spectroscopy (EIS) of individual electrodes with high current was characterized to analyze the behavior of the coating degradation and metal corrosion at coating/metal interface. The polarity switch of the electrode under the coating was observed. The mechanism of coating degradation and carbon steel substrate corrosion was discussed from a point of electrochemical distribution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006035/abstract [article] Correlation between electrochemical impedance and current distribution of carbon steel under organic coating [texte imprimé] / D. Kong, Auteur ; Y. Wang, Auteur ; W. Zhang, Auteur . - 2012 . - pp. 475–480. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 475–480 Mots-clés : Current  distribution;  EIS;  organic  coating;  wire  beam  electrode Résumé : The current distribution of carbon steel beneath intact organic coating exposed to 3.5% NaCl solution was investigated by the wire beam electrode (WBE) method. The electrochemical impedance spectroscopy (EIS) of individual electrodes with high current was characterized to analyze the behavior of the coating degradation and metal corrosion at coating/metal interface. The polarity switch of the electrode under the coating was observed. The mechanism of coating degradation and carbon steel substrate corrosion was discussed from a point of electrochemical distribution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006035/abstract

Evaluating wind loads on bridge decks using velocity fields / W. Zhang in Journal of engineering mechanics, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 139 N° 3 (Mars 2013) . - pp.339–346. Titre : Evaluating wind loads on bridge decks using velocity fields Type de document : texte imprimé Auteurs : W. Zhang, Auteur ; Y. J. Ge, Auteur ; C. S. Cai, Auteur Année de publication : 2013 Article en page(s) : pp.339–346. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Wind  force  Wind-velocity  fields  Square  cylinder  Twin-box  girder  Particle  image  velocimetry  Computational  fluid  dynamics Résumé : The wind loads including forces and moments on bridge decks are evaluated in the current study using the velocity fields and their derivatives. Based on the conservation of momentum and momentum moment, the integral over the control volume is converted to the surface integral over the boundary of the control volume using the divergence theorem. The wind forces and moments can be calculated based on the obtained velocity fields and their derivatives around bridge decks, and the pressure terms in the equations are canceled out. Velocity fields are obtained from computational fluid dynamics (CFD) simulations and particle image velocimetry (PIV) wind tunnel experiments. Results from different turbulence models are compared with each other and wind tunnel experimental results in the literature. The calculated wind loads from numerical integrations of velocity fields from PIV experiments or CFD numerical simulations are compared with the results from a direct integration of the CFD-simulated surface pressure and the results from force-balance measurements in the wind tunnel. The results from several cases with different sizes of control volumes and space resolutions for both the square cylinder section and the twin-box girder section are discussed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000504 [article] Evaluating wind loads on bridge decks using velocity fields [texte imprimé] / W. Zhang, Auteur ; Y. J. Ge, Auteur ; C. S. Cai, Auteur . - 2013 . - pp.339–346. Applied mechanics Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 139 N° 3 (Mars 2013) . - pp.339–346. Mots-clés : Wind  force  Wind-velocity  fields  Square  cylinder  Twin-box  girder  Particle  image  velocimetry  Computational  fluid  dynamics Résumé : The wind loads including forces and moments on bridge decks are evaluated in the current study using the velocity fields and their derivatives. Based on the conservation of momentum and momentum moment, the integral over the control volume is converted to the surface integral over the boundary of the control volume using the divergence theorem. The wind forces and moments can be calculated based on the obtained velocity fields and their derivatives around bridge decks, and the pressure terms in the equations are canceled out. Velocity fields are obtained from computational fluid dynamics (CFD) simulations and particle image velocimetry (PIV) wind tunnel experiments. Results from different turbulence models are compared with each other and wind tunnel experimental results in the literature. The calculated wind loads from numerical integrations of velocity fields from PIV experiments or CFD numerical simulations are compared with the results from a direct integration of the CFD-simulated surface pressure and the results from force-balance measurements in the wind tunnel. The results from several cases with different sizes of control volumes and space resolutions for both the square cylinder section and the twin-box girder section are discussed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000504

High - performance hybrid magnetorheological materials / W. Zhang in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp12471–12476 Titre : High - performance hybrid magnetorheological materials : preparation and mechanical properties Type de document : texte imprimé Auteurs : W. Zhang, Auteur ; X. L. Gong, Auteur ; S. H. Xuan, Auteur Année de publication : 2011 Article en page(s) : pp12471–12476 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Magnetorheological  Mechanical  properties Résumé : To improve mechanical performance of magnetorheological elastomers (MREs), two novel hybrid magnetorheological elastomers that were embedded with magnetorheological fluids (MRFs) and magnetorheological gels (MRGs) were fabricated. In this work, MRFs and MRGs were injected into different numbers of holes that were punched on MRE specimens regularly. The nonlinear mechanical properties of the as-prepared magnetorheological fluid-elastomers (MRFEs) and magnetorheological gel-elastomers (MRGEs) were investigated in the presence of external homogeneous magnetic fields. The modulus, loss factor, and hysteresis were evaluated with a modified dynamic mechanical analyzer (DMA) and vibrating sample magnetometer (VSM). Dependence of the rheological response on the volume fraction was also investigated. As the experimental results show, not only were the initial moduli of the two novel hybrid magnetorheological materials higher than those of both the MRFs and MRGs, but also their magnetorheological (MR) effects were better than those of MREs. The loss factors of the two new hybrids were different from those of traditional MREs. Moreover, their dynamic properties changed according to the different volume ratios of MRFs and MRGs injected into the MRE specimens. These results suggest that the two novel hybrid magnetorheological elastomers are improved systems with volume-fraction-dependent rheological responses and the mechanical properties of MREs can be improved by embedding them with MRFs and MRGs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101904f [article] High - performance hybrid magnetorheological materials : preparation and mechanical properties [texte imprimé] / W. Zhang, Auteur ; X. L. Gong, Auteur ; S. H. Xuan, Auteur . - 2011 . - pp12471–12476. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp12471–12476 Mots-clés : Magnetorheological  Mechanical  properties Résumé : To improve mechanical performance of magnetorheological elastomers (MREs), two novel hybrid magnetorheological elastomers that were embedded with magnetorheological fluids (MRFs) and magnetorheological gels (MRGs) were fabricated. In this work, MRFs and MRGs were injected into different numbers of holes that were punched on MRE specimens regularly. The nonlinear mechanical properties of the as-prepared magnetorheological fluid-elastomers (MRFEs) and magnetorheological gel-elastomers (MRGEs) were investigated in the presence of external homogeneous magnetic fields. The modulus, loss factor, and hysteresis were evaluated with a modified dynamic mechanical analyzer (DMA) and vibrating sample magnetometer (VSM). Dependence of the rheological response on the volume fraction was also investigated. As the experimental results show, not only were the initial moduli of the two novel hybrid magnetorheological materials higher than those of both the MRFs and MRGs, but also their magnetorheological (MR) effects were better than those of MREs. The loss factors of the two new hybrids were different from those of traditional MREs. Moreover, their dynamic properties changed according to the different volume ratios of MRFs and MRGs injected into the MRE specimens. These results suggest that the two novel hybrid magnetorheological elastomers are improved systems with volume-fraction-dependent rheological responses and the mechanical properties of MREs can be improved by embedding them with MRFs and MRGs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101904f

Stable flowing of localized shear bands in soft bulk metallic glasses / Q. S. Zhang in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 904-909 Titre : Stable flowing of localized shear bands in soft bulk metallic glasses Type de document : texte imprimé Auteurs : Q. S. Zhang, Auteur ; W. Zhang, Auteur ; G. Q. Xie, Auteur Article en page(s) : pp. 904-909 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Metallic  glasses  Hardness  test  Compression  test  Plastic  deformation Index. décimale : 669 Métallurgie Résumé : This paper reports a novel class of Zr–Cu–Fe–Al bulk metallic glasses (BMGs) with high Zr content and unusual deformation behavior. Higher content of Zr results in lower hardness, but favors the generation of highly localized shear bands, even if nanocrystalline phases precipitate in the glassy matrix. Moreover, flow of the dominant shear band proceeds slowly under compressive stress without rapid shear rupture and facture. The unusual deformation behavior suggests that designing BMG with a high content of solvent element and low hardness might be a promising new way of developing ductile BMG. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Stable flowing of localized shear bands in soft bulk metallic glasses [texte imprimé] / Q. S. Zhang, Auteur ; W. Zhang, Auteur ; G. Q. Xie, Auteur . - pp. 904-909. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 904-909 Mots-clés : Metallic  glasses  Hardness  test  Compression  test  Plastic  deformation Index. décimale : 669 Métallurgie Résumé : This paper reports a novel class of Zr–Cu–Fe–Al bulk metallic glasses (BMGs) with high Zr content and unusual deformation behavior. Higher content of Zr results in lower hardness, but favors the generation of highly localized shear bands, even if nanocrystalline phases precipitate in the glassy matrix. Moreover, flow of the dominant shear band proceeds slowly under compressive stress without rapid shear rupture and facture. The unusual deformation behavior suggests that designing BMG with a high content of solvent element and low hardness might be a promising new way of developing ductile BMG. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

Stable flowing of localized shear bands in soft bulk metallic glasses / Q. S. Zhang in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 904–909 Titre : Stable flowing of localized shear bands in soft bulk metallic glasses Type de document : texte imprimé Auteurs : Q. S. Zhang, Auteur ; W. Zhang, Auteur ; G. Q. Xie, Auteur Année de publication : 2011 Article en page(s) : pp. 904–909 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Metallic  glasses  Hardness  test  Compression  test  Plastic  deformation Résumé : This paper reports a novel class of Zr–Cu–Fe–Al bulk metallic glasses (BMGs) with high Zr content and unusual deformation behavior. Higher content of Zr results in lower hardness, but favors the generation of highly localized shear bands, even if nanocrystalline phases precipitate in the glassy matrix. Moreover, flow of the dominant shear band proceeds slowly under compressive stress without rapid shear rupture and facture. The unusual deformation behavior suggests that designing BMG with a high content of solvent element and low hardness might be a promising new way of developing ductile BMG. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006843 [article] Stable flowing of localized shear bands in soft bulk metallic glasses [texte imprimé] / Q. S. Zhang, Auteur ; W. Zhang, Auteur ; G. Q. Xie, Auteur . - 2011 . - pp. 904–909. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 904–909 Mots-clés : Metallic  glasses  Hardness  test  Compression  test  Plastic  deformation Résumé : This paper reports a novel class of Zr–Cu–Fe–Al bulk metallic glasses (BMGs) with high Zr content and unusual deformation behavior. Higher content of Zr results in lower hardness, but favors the generation of highly localized shear bands, even if nanocrystalline phases precipitate in the glassy matrix. Moreover, flow of the dominant shear band proceeds slowly under compressive stress without rapid shear rupture and facture. The unusual deformation behavior suggests that designing BMG with a high content of solvent element and low hardness might be a promising new way of developing ductile BMG. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006843

Use of frother with sampling-for-imaging bubble sizing technique / W. Zhang in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

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Wind - induced internal pressures of buildings with multiple openings / F. Pan in Journal of engineering mechanics, Vol. 139 N° 3 (Mars 2013) 

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