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To cite this version:D Garcia, Jean-José Orteu, Luc Penazzi. A combined temporal tracking and stereo-correlation technique for accurate measurement of 3D displacements: application to sheet metal forming. Journal of Materials Processing Technology, Elsevier, 2002Elsevier, , 125-126, pp.736-742. 10.1016 AbstractOptical methods that give displacement or strain fields are now emerging significantly in the mechanical sciences. Much work has been done on two dimensional (2D) displacement/strain measurement from a single camera but the proposed methods give only in plane strains. A binocular correlation based stereovision technique has been developed: (a) to measure the three dimensional (3D) shape of a static object or (b) to measure the strains of an object undergoing some 3D mechanical or thermal stress.In this paper, the application of the stereo correlation technique to measure accurately the 3D shape of a stamped sheet metal part or the surface strain field undergone by the part during the stamping process is presented.

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Low pressure oxygen plasma has been used to improve the surface wettability of a polyurethane film. The modifications induced by the plasma treatment in the material were analyzed using contact angle measurements. X-ray photoelectron spectroscopy technique was used for surface characterization of the plasma-treated films. Atomic force microscopy and scanning electron microscopy were used to analyze topography changes due to the plasma-etching mechanism. The results show a much better surface wettability of the film even for short exposure times, with a considerable increase in the surface energy values. As expected, functionalization with oxygen plasma is mainly because of surface oxidation with species like (CÀ ÀO, C¼ ¼O, OH, etc). An aging process with regard to polar groups rearrangement has been observed, thus promoting a partial hydrophobic recovery. Besides functionalization, the surface wettability of the material improves as a consequence of a slight increase in surface roughness because of the etching effect of oxygen plasma.

A novel pressureless reaction sintering process is presented for the fabrication of Al2O3-aluminide alloys (3A). Compacts of intensively milled metal oxide-aluminum mixtures are heat-treated in vacuum or inert atmosphere such that the exothermic reactions take place in a controlled manner essentially at temperatures below the melting point of Al. Dense, homogeneous microstructures were obtained with a variety of Al2O3-matrix systems with interpenetrating networks of aluminides of Ti, Fe, Nb, Mo, Zr, Ni, etc. By adding modifiers in the form of oxides or metals, volume and phase composition as well as properties can be tailored in a wide range.

Previous studies suggest that localization of tumor necrosis factor receptor (TNFR)-associated factor (TRAF) family members is important for regulating their signal transduction. During a screen for TRAF3-associated proteins that potentially alter TRAF3 subcellular localization and enable signal transduction, we identi¢ed a novel protein, T3JAM (TRAF3-interacting Jun N-terminal kinase (JNK)-activating modulator). This protein associates speci¢cally with TRAF3 but not other TRAF family members. Coexpression of T3JAM with TRAF3 recruits TRAF3 to the detergent-insoluble fraction. More importantly, T3JAM and TRAF3 synergistically activate JNK but not nuclear factor (NF)-U UB. Our studies indicate that T3JAM may function as an adapter molecule that speci¢cally regulates TRAF3-mediated JNK activation. ß