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Tenue mécanique de liners en titane pour réservoirs haute pression

Abstract : This thesis is a part of the FRESCORT project whose purpose is to develop high pressure tanks in composite material. The metallic liner of these tanks consist of a sheet of 300µm thick and of TA6V nozzles. The present work is dedicated to the study of the microstructure, of the mechanical properties and of the modeling of the observed behavior. It appears that the T35 and the TA6V have very different microstructure and chemical compositions. Moreover, in the welding zones between T35 and TA6V, cavities are observed. These cavities seem caused by the vaporization of the aluminum, present in the TA6V, during the welding operation. The mechanical behavior of T35 titanium is described using monotonic tensile tests, tensile/recovery tests and monotonic and cyclic shear tests. These tests have shown an anisotropic elastic-viscoplastic behavior with an negative isotropic hardening. The modeling of the mechanical behavior and the identification of related parameters use the experimental database obtained previously. It is shown that an anisotropic model with isotropic and kinematic hardening accurately describe the stress and strain anisotropy, the cyclic shear behavior and the plastic behavior for strain levels up to 50%. Finally, the failure of T35 titanium sheets is studied. A stable propagation with a high plastic deformation at the crack tip is found. Various tomography and laminography observations revealed the presence of few cavities near cracks, which indicates that there is few damage during the crack propagation.
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Submitted on : Tuesday, April 21, 2015 - 3:52:05 PM
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  • HAL Id : tel-01144414, version 1


Melchior Simon-Perret. Tenue mécanique de liners en titane pour réservoirs haute pression. Mécanique des matériaux [physics.class-ph]. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0096⟩. ⟨tel-01144414⟩



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