English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Some implants have approximately a lifetime of 15 years. The femoral stem,for example, should be made of 316L/316LN stainless steel. Fretting corrosion,friction under small displacements, should occur during human gait, due torepeated loadings and un-loadings, between stainless steel and bone forinstance. Some experimental investigations of fretting corrosion have beenpracticed. As well known, metallic alloys and especially stainless steels arecovered with a passive film that prevents from the corrosion and degradation.This passive layer of few nanometers, at ambient temperature, is the key of ourcivilization according to some authors. This work is dedicated to predict thepassive layer thicknesses of stainless steel under fretting corrosion with aspecific emphasis on the role of proteins. The model is based on the PointDefect Model (micro scale) and an update of the model on the friction process(micro-macro scale). Genetic algorithm was used for finding solution of theproblem. The major results are, as expected from experimental results, albuminprevents from degradation at the lowest concentration of chlorides; anincubation time is necessary for degrading the passive film; under frettingcorrosion and high concentration of chlorides the passive behavior isannihilated.  Les implants orthop\'ediques de hanche ont une dur\'ee de vie d'environ 15ans. Par exemple, la tige f\'emorale d'un tel implant peut \^etre r\'ealis\'eeen acier inoxydable 316L ou 316LN. Le fretting corrosion, frottement souspetits d\'eplacements, peut se produire pendant la marche humaine en raison deschargements r\'ep\'et\'es entre le m\'etal de la proth\`ese et l'os. Plusieursinvestigations exp\'erimentales du fretting corrosion ont \'et\'e entreprises.Cette couche passive de quelques nanom\`etres, \`a temp\'erature ambiante, estle point clef sur lequel repose le d\'eveloppement de notre civilisation, seloncertains auteurs. Ce travail vise \`a pr\'edire les \'epaisseurs de cettecouche passive de l'acier inoxydable soumis au fretting corrosion, avec uneattention sp\'ecifique sur le r\^ole des prot\'eines. Le mod\`ele utilis\'e estbas\'e sur le Point Defect Model, PDM (\`a une \'echelle microscopique) et uneam\'elioration de ce mod\`ele en prenant en compte le processus de frottementsous petits d\'ebattements. L'algorithme g\'en\'etique a \'et\'e utilis\'e pouroptimiser la convergence du probl\`eme. Les r\'esultats les plus importantssont, comme d\'emontr\'e avec les essais exp\'erimentaux, que l'albumine, laprot\'eine \'etudi\'ee, emp\^eche les d\'egradations de l'acier inoxydable auxplus faibles concentrations d'ions chlorure ; ensuite, aux plus fortesconcentrations de chlorures, un temps d'incubation est n\'ecessaire pourd\'etruire le film passif.

Predicting the steady state thickness of passive films with the Point Defect Model in fretting corrosion experiments