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Institution

ParisTech

EducationParis, France
About: ParisTech is a education organization based out in Paris, France. It is known for research contribution in the topics: Residual stress & Finite element method. The organization has 1888 authors who have published 1965 publications receiving 55532 citations. The organization is also known as: Paris Institute of Technology & ParisTech Développement.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a comparative study of the surface modifications induced by two different lasers on a 2050-T8 aluminum alloy, with a specific consideration of residual stress and work-hardening levels, was conducted.
Abstract: Purpose – The purpose of this paper is to conduct a comparative study of the surface modifications induced by two different lasers on a 2050‐T8 aluminum alloy, with a specific consideration of residual stress and work‐hardening levels.Design/methodology/approach – Two lasers have been used for Laser shock peening (LSP) treatment in water‐confined regime: a Continuum Powerlite Plus laser, operating at 0.532 mm with 9 ns laser pulses, and near 1.5mm spot diameters; a new generation Gaia‐R Thales laser delivering 10 J‐10 ns impacts, with 4‐6mm homogeneous laser spots at 1.06 mm. Surface deformation, work‐hardening levels and residual stresses were analyzed for both LSP conditions. Residual stresses were compared with numerical simulations using a 3D finite element (FE) model, starting with the validation of surface deformations induced by a single laser impact.Findings – Similar surface deformations and work‐hardening levels, but relatively lower residual stresses were obtained with the new large 4‐6 mm impa...

17 citations

Book ChapterDOI
01 Jan 2011
TL;DR: In this paper, a multiscale surface characterization approach is applied to study surface design features of the Ball Python regius that are beneficial to design high-quality lubricating surfaces (such as those obtained through plateau honing).
Abstract: A major concern in designing tribosystems is to minimize friction, save energy, and to reduce wear. Satisfying these requirements depends on the integrity of the rubbing surface and its suitability to sliding conditions. As such, designers currently focus on constructing surfaces that are an integral part of the function of the tribosystem. Inspirations for such constructs come from studying natural systems and from implementing natural design rules. One species that may serve as an analogue for design is the Ball Python. This is because such a creature doesn’t sustain much damage while depending on legless locomotion when sliding against various surfaces, many of which are deemed tribologically hostile. Resistance to damage in this case originates from surface design features. As such, studying these features and how do they contribute to the control of friction and wear is very attractive for design purposes. In this chapter, we apply a multiscale surface characterization approach to study surface design features of the Python regius that are beneficial to design high-quality lubricating surfaces (such as those obtained through plateau honing). To this end, we studied topographical features by SEM and through white light interferrometery. We further probe the roughness of the surface on multiscale and as a function of location within the body. The results are used to draw a comparison to metrological features of commercial cylinder liners obtained by plateau honing.

17 citations

Journal ArticleDOI
TL;DR: In this paper, a gamme de plaisirs epistemiques is decouvre, a mieux connaitre ses terres, a experimenter, a etre surpris, a chercher a comprendre le systeme cultural dans sa globalite.
Abstract: Bien que volontaires dans leur demarche de changement, les agriculteurs qui s’engagent dans la reduction d’intrants vivent bien souvent leurs changements de pratique comme une evolution necessaire. Le deplacement d’habitudes produit des inquietudes et des difficultes maintenant bien cernees, dont les animateurs agricoles cherchent a circonscrire les effets. L’analyse du cours de vie de douze agriculteurs en systeme de grandes cultures impliques dans le test d’un cahier des charges vers une agriculture econome montre cependant que les pratiques de changement s’accompagnent aussi d’emotions positives, souvent a rebours des anticipations de l’agriculteur et jusqu’ici peu decrites par la litterature. Ces plaisirs – a demontrer, a se distinguer, a faire ensemble, a etre destinataire d’une transmission – emergent dans les relations de l’agriculteur avec les autres, mais egalement avec son exploitation : on decouvre une gamme de plaisirs epistemiques – a mieux connaitre ses terres, a experimenter, a etre surpris, a chercher a comprendre le systeme cultural dans sa globalite. Si cette mise en evidence de plaisirs induits est potentiellement risquee, puisqu’elle peut rendre legitimes des injonctions au changement, elle constitue neanmoins, dans le cadre de pratiques non prescriptives des animateurs agricoles, un argument incitatif supplementaire en faveur de la transition agro-ecologique. Elle ouvre par ailleurs a une captation des resultats acquis dans le champ de la souffrance au travail, qui pointent en creux le besoin de points de satisfaction, et sur un plan theorique plus general, constitue une illustration de l’integration des emotions dans une perspective d’analyse situee.

17 citations

Journal ArticleDOI
TL;DR: The overall objective of this paper is to evaluate the MERLIN indicator and sub-indicators, an assessment method developed by French agricultural advisors, and confirm that the indicator is considered useful by decision-makers but also reveals that in some cases users adapt parameter values to their situation.

17 citations


Authors

Showing all 1899 results

NameH-indexPapersCitations
Mathias Fink11690051759
George G. Malliaras9438228533
Mickael Tanter8558329452
Gerard Mourou8265334147
Catherine Lapierre7922718286
Carlo Adamo7544436092
Jean-François Joanny7229420700
Marie-Paule Lefranc7238121087
Paul B. Rainey7022217930
Vincent Lepetit7026826207
Bernard Asselain6940923648
Michael J. Baker6939420834
Jacques Prost6819819064
Jean-Philippe Vert6723517593
Jacques Mairesse6631020539
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20239
202212
202174
202093
2019127
2018145