Documents disponibles écrits par cet auteur

Corrosion performance and mechanical properties of joined automotive materials / N. LeBozec in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 408–415 Titre : Corrosion performance and mechanical properties of joined automotive materials Type de document : texte imprimé Auteurs : N. LeBozec, Auteur ; A. LeGac, Auteur ; D. Thierry, Auteur Année de publication : 2012 Article en page(s) : pp. 408–415 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : adhesive  bonding;  automotive;  clinching;  corrosion;  joint  strength;  welding Résumé : The automotive industry envisions that an optimized vehicle in terms of performance and cost can be achieved only by using different materials at different vehicle locations in order to utilize the functionality of the different materials to a full extent. Currently, steel and aluminum are the most important construction materials for the mass production of automotive structure. However, other materials such as magnesium alloys and stainless steel are also used. The use of dissymmetric assemblies of materials in the automotive industry has also led to the development of joining technologies other than spot welding and arc welding such as clinching, adhesive bonding, laser welding, and MIG brazing. However, and despite the development of these new joining technologies, there are still important gaps of knowledge with regards to the corrosion performance of different joint populations using dissymmetric and symmetric materials. Materials commonly used in the automotive industry including steel and aluminum-based susbtrates were assembled with different combinations using various joining techniques in order to evaluate their corrosion performance as well their mechanical properties after cyclic accelerated corrosion tests. The results indicated a relationship between the corrosion inside the confined joint and the decrease of the mechanical properties of the assemblies. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005888/abstract [article] Corrosion performance and mechanical properties of joined automotive materials [texte imprimé] / N. LeBozec, Auteur ; A. LeGac, Auteur ; D. Thierry, Auteur . - 2012 . - pp. 408–415. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 408–415 Mots-clés : adhesive  bonding;  automotive;  clinching;  corrosion;  joint  strength;  welding Résumé : The automotive industry envisions that an optimized vehicle in terms of performance and cost can be achieved only by using different materials at different vehicle locations in order to utilize the functionality of the different materials to a full extent. Currently, steel and aluminum are the most important construction materials for the mass production of automotive structure. However, other materials such as magnesium alloys and stainless steel are also used. The use of dissymmetric assemblies of materials in the automotive industry has also led to the development of joining technologies other than spot welding and arc welding such as clinching, adhesive bonding, laser welding, and MIG brazing. However, and despite the development of these new joining technologies, there are still important gaps of knowledge with regards to the corrosion performance of different joint populations using dissymmetric and symmetric materials. Materials commonly used in the automotive industry including steel and aluminum-based susbtrates were assembled with different combinations using various joining techniques in order to evaluate their corrosion performance as well their mechanical properties after cyclic accelerated corrosion tests. The results indicated a relationship between the corrosion inside the confined joint and the decrease of the mechanical properties of the assemblies. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005888/abstract

Influence of climatic factors in cyclic accelerated corrosion test towards the development of a reliable and repeatable accelerated corrosion test for the automotive industry / N. LeBozec in Materials and corrosion, Vol. 61 N° 10 (Octobre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 845–851 Titre : Influence of climatic factors in cyclic accelerated corrosion test towards the development of a reliable and repeatable accelerated corrosion test for the automotive industry Type de document : texte imprimé Auteurs : N. LeBozec, Auteur ; D. Thierry, Auteur Année de publication : 2011 Article en page(s) : pp. 845–851 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Automotive;  testing Résumé : Two designs of experiments made of nine accelerated tests each were used in order to study the influence of a selection of important climatic parameters such as the concentration of NaCl, the drying level, the basic humidity cycle, the frequency of salt spray and the temperature. The accelerated corrosion tests were all performed using automatic chambers. Different automotive materials were selected in order to study the resistance to cosmetic corrosion, perforation corrosion and bi-metallic corrosion. For cosmetic materials, coated panels of cold rolled steel (CRS), zinc-coated steel and aluminium alloys were chosen. Perforation corrosion was investigated using crevice panels of CRS, zinc-coated steel or different grades of aluminium alloys. From the results, the influence of testing conditions on the cosmetic and perforation corrosion of different automotive materials was obtained. As an example, it was shown that an elevation of the temperature from 35 to 45 °C in the cyclic corrosion test increased the scribe creep on painted CRS and aluminium alloys while it has no significant effects on painted hot dip galvanized (HDG) panels. The results were also compared to that obtained after 2 years of exposure at a marine exposure site and on busses driving in area using de-icing salt. It was shown that one of the tests performed gives a good correlation to field results. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905497/abstract [article] Influence of climatic factors in cyclic accelerated corrosion test towards the development of a reliable and repeatable accelerated corrosion test for the automotive industry [texte imprimé] / N. LeBozec, Auteur ; D. Thierry, Auteur . - 2011 . - pp. 845–851. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 845–851 Mots-clés : Automotive;  testing Résumé : Two designs of experiments made of nine accelerated tests each were used in order to study the influence of a selection of important climatic parameters such as the concentration of NaCl, the drying level, the basic humidity cycle, the frequency of salt spray and the temperature. The accelerated corrosion tests were all performed using automatic chambers. Different automotive materials were selected in order to study the resistance to cosmetic corrosion, perforation corrosion and bi-metallic corrosion. For cosmetic materials, coated panels of cold rolled steel (CRS), zinc-coated steel and aluminium alloys were chosen. Perforation corrosion was investigated using crevice panels of CRS, zinc-coated steel or different grades of aluminium alloys. From the results, the influence of testing conditions on the cosmetic and perforation corrosion of different automotive materials was obtained. As an example, it was shown that an elevation of the temperature from 35 to 45 °C in the cyclic corrosion test increased the scribe creep on painted CRS and aluminium alloys while it has no significant effects on painted hot dip galvanized (HDG) panels. The results were also compared to that obtained after 2 years of exposure at a marine exposure site and on busses driving in area using de-icing salt. It was shown that one of the tests performed gives a good correlation to field results. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905497/abstract