Entity

Time filter

Source Type

Sèvres, France

Pele M.,CTIF
Yejin Fenxi/Metallurgical Analysis | Year: 2012

This presentation aims to recall "old" concepts and instructions, regarding sampling methods and sample preparation.Information on the procedures used in other fields of the metallurgical analysis, besides that of steel, will be given.However, these concepts and procedures are mostly linked to the foundry industry knowledge rather than to other possible fields requiring specific operations (if any).Sampling by itself is an "useless" action: it has to be taken as a corner of a "triangular" process, where the other two are the matrix under concern and the technique(s) to be used.A fourth "dimension"-the preparation of the sample-will also be detailed regarding its suitability, taking into account the alloy and the analytical technique (or method) supposed to be used.In cases of samples taken from a "piece", warning on the re-melting possibilities and limits will be reminded.Some particular cases related with the preparation of divided samples will also be underlined.In parallel, the expertise (or rather, the lack of expertise) of operators in charge of these tasks will be reminded, together with that of customers sending "all kind of sample" to a laboratory (namely the third party ones).At last, the existing standards on "Sampling and sample preparation" will be pointed out, together with a "complaint" regarding the content of these documents, as some of them are not enough "mandatory": they may lead therefore to some "bad" practices. Source


Aguiar R.L.,University of Aveiro | Onur E.,Technical University of Delft | Skouby K.E.,CTIF | Aguayo-Torres M.C.,University of Malaga | Toftegaard T.S.,University of Aarhus
Wireless Personal Communications | Year: 2010

This paper briefly presents some conclusions of a brainstorming session on the way technology is evolving in ICT. Technology advances have overcome society ability to answer, both in economic and in human aspects. The current design paradigms, of agnostic technology development, need to be reconsidered, and the user needs to be repositioned at the center of future developments. © The Author(s) 2010. Source


Mu P.,Teleport | Nadot Y.,Teleport | Nadot-Martin C.,Teleport | Chabod A.,CTIF | And 2 more authors.
International Journal of Fatigue | Year: 2014

AS7G06-T6 cast aluminum alloy is tested under tension fatigue loading for two load ratios. After the quantification of the Secondary Dendrite Arm Spacing (SDAS) and grain size of the material, fatigue tests are analyzed through fractographic Scanning Electron Microscope (SEM) observations in order to reveal the type of defects at the origin of the failure. The quantification of the defect size is performed for each defect and Kitagawa type diagrams are produced for each load ratio. It is shown that the critical defect size that does not lower the fatigue strength is close to the grain size of the material. The Defect Stress Gradient (DSG) approach that aims to simulate defect influence on the fatigue strength is presented in a multiaxial context. DSG approach is finally implemented in a finite element simulation of a structural component in order to show that such an approach can provide a defect size map. The latter can be used to define allowable defect size for industrial components. © 2014 Elsevier Ltd. All rights reserved. Source


Mu P.,Teleport | Nadot Y.,Teleport | Serrano-Munoz I.,INSA Lyon | Chabod A.,CTIF
Engineering Fracture Mechanics | Year: 2014

AS7G06-T6 cast aluminum alloy is tested under tension, torsion and tension-torsion fatigue loading for two load ratios. Basquin's law and step loading method are used to obtain the fatigue limit under multiaxial loading. Crossland criterion and principal stress criterion considering Goodman idea are compared to evaluate the multiaxial behavior. The influence of complex defects on fatigue limit is analyzed under multiaxial loadings. Several artificial defects are machined on fatigue specimen with different distance between edges. A new definition of the equivalent defect size considering the distance between defect edges is proposed. For both tension and tension-torsion fatigue, the competition between single natural defect and complex artificial defects is observed and analyzed. © 2014 Elsevier Ltd. Source


Mu P.,Teleport | Nadot Y.,Teleport | Serrano-Munoz I.,INSA Lyon | Chabod A.,CTIF
Engineering Fracture Mechanics | Year: 2014

AS7G06-T6 cast aluminum alloy is tested under tension, torsion and tension-torsion fatigue loading for two load ratios. Basquin's law and step loading method are used to obtain the fatigue limit under multiaxial loading. Crossland criterion and principal stress criterion considering Goodman idea are compared to evaluate the multiaxial behavior. The influence of complex defects on fatigue limit is analyzed under multiaxial loadings. Several artificial defects are machined on fatigue specimen with different distance between edges. A new definition of the equivalent defect size considering the distance between defect edges is proposed. For both tension and tension-torsion fatigue, the competition between single natural defect and complex artificial defects is observed and analyzed. © 2014 Elsevier Ltd. Source

Discover hidden collaborations