Study of the reliability of corroded pipeline by the ASME B31G method

International audienc

Strain analysis during tensile test using digital image correlation (DIC)

International audienc

A new constitutive modelling for springback prediction in sheet metal forming processes

International audienc

Influence of the material microstructural properties on a 3 point bending test

International audienc

A new constitutive modelling for springback prediction in sheet metal forming processes

International audienc

Influence of the material microstructural properties on a 3-point bending test

International audienceThe purpose of this study is to highlight the role played by some important factors on sprinback phenomenon. This latter affects significantly the geometry of the manufactured product. Large automotive or plane body parts are specifically affected by this phenomenon which complicates the tools design. The study focuses here on specific materials with high trend to develop heterogeneous strains during forming processes. Due to its hexagonal crystalline structure, titanium has initial heterogeneous microstructure that grows stronger when plastic strain occurs. Heterogeneous microstructures induce the coexistence in the material of volumes with different mechanical properties even, in some case, with different mechanical behaviours. Therefore, accommodation between these volumes generates distributed internal stresses and important elastic energy storage. The macroscopic behaviour can be provided either by average phenomenological constitutive equation identical for all locations in the material or by integrating a set of local constitutive relations taking into account the variability of the behaviour as a function of the position in the material. In this context, experimental and numerical studies of a 3-point bending test on titanium alloy are considered

Experimental design on bimaterial forming

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Thermal aging effect on the mechanical properties of polyester fiberglass composites

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Analyse des propriétés mécaniques d’un composite vieilli par la méthode de corrélation d’images

International audienc

A Thermal aging and catalyst concentration effects on thermo-dynamical and mechanical properties of a polyester fiberglass composite

This work deals with the characterization by physicochemical and mechanical analysis performed on composite polyester fiberglass plates molded by contact and aged in thermo-stated ovens to simulate their deleterious environment of use. The DSC analysis revealed that the catalyst concentration affected the thermal behavior of the composite. Indeed, the addition of a higher catalyst concentration slightly lowered the glass transition temperature. From a mechanical point of view, it was observed that the catalyst addition made the material stiffer. The properties at fracture were also affected by the catalyst concentration and varied irregularly with aging