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Etude du comportement en sollicitations extrêmes et de l'usinabilite d'un nouvel alliage de titane aeronautique : le ti555-3

Abstract : The titanium alloy Ti555-3 is starting to have many aeronautical applications. However the machining of this material raises certain difficulties. This study aims to analyze the machinability of this alloy and compare it to a reference alloy, Ti-6Al-4V. Three aspects have been explored. Instrumented orthogonal cutting tests have been conducted and chip morphology is investigated. This study provided insight into the influence of different cutting parameters or the machining conditions on the machinability of Ti555-3. Thus, the evolution of cutting forces, the temperature in the cutting zone, the morphology of the chip and the evolution of the residual stresses have been highlighted. High strain rate shear tests have been undertaken to replicate the observations obtained under machining conditions and to identify, by the inverse method, the Johnson-Cook material behavior used in the finite element simulation of chip formation. An investigation of High Pressure Water Jet Assisted Machining (HPWJAM) was conducted at different cutting speeds and feed rates. The different chip forms are discussed. The residual stresses generated by HPWJAM were studied. This analysis shows that this technique results in residual surface stresses that are more compressive. The use of laser assisted machining (LAM) is investigated to increase many aspects of the machinability of titanium alloys. This study showed a highly significant influence of laser power on the cutting forces and surface integrity of machined parts.
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https://pastel.archives-ouvertes.fr/pastel-00560093
Contributor : Tarek Braham Bouchnak <>
Submitted on : Thursday, January 27, 2011 - 11:43:08 AM
Last modification on : Friday, July 17, 2020 - 2:58:26 PM
Long-term archiving on: : Friday, December 2, 2016 - 6:15:43 PM

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  • HAL Id : pastel-00560093, version 1

Citation

Tarek Braham Bouchnak. Etude du comportement en sollicitations extrêmes et de l'usinabilite d'un nouvel alliage de titane aeronautique : le ti555-3. Mécanique des matériaux [physics.class-ph]. Arts et Métiers ParisTech, 2010. Français. ⟨NNT : 2010ENAM0051⟩. ⟨pastel-00560093⟩

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