 |
|
Theses
Étude numérique et expérimentale de la séparation par chocs brefs d'interface de revêtements multi-couches. Application au test d'adhérence par chocs laser
Étude numérique et expérimentale de la séparation par chocs brefs d'interface de revêtements multi-couches. Application au test d'adhérence par chocs laser
Abstract : Laser shock driven on a multi layer system yields traction stress at the interface and provides a new process for testing the bond strength of coatings by the LASer Adherence Test (LASAT). Interface bond strength of various metallic systems has been evidenced using high power laser facilities together with a VISAR diagnosis. Traction stress generation has been analyzed in order to optimize the traction at the interface , according to waves synchronization process. These results have been confirmed by 1D and 2D numerical simulation. Two dimensional effects of the shock loading on traction of the interface have been numerically and experimentally evidenced Experimental measurements have been recovered by numerical simulation implementing dynamic failure criteria of Kanel and Tuler Butcher. A realistic modeling of both roughness and porosity of coatings for plasma sprayed coatings improves consistence between numerical simulation and experiments using the LASAT process.
https://tel.archives-ouvertes.fr/tel-00009573
Contributor : Cyril Bolis <>
Submitted on : Wednesday, June 22, 2005 - 10:59:10 PM
Last modification on : Monday, October 19, 2020 - 11:06:05 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:39:37 PM
Contributor : Cyril Bolis <>
Submitted on : Wednesday, June 22, 2005 - 10:59:10 PM
Last modification on : Monday, October 19, 2020 - 11:06:05 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:39:37 PM