VISAR Pull‐Back Signals as a Diagnostic for the LASer Adherence Test Applied to Copper Coating on Aluminum Substrate

The LASer Adherence Test so‐called LASAT aims to control the interface adhesion of a coating deposited over a substrate which is irradiated by a high power laser intensity. The shock waves propagation yields traction at the interface, likely to debond the coating. This technique has been applied to a copper plasma sprayed coating on an aluminum substrate. During the test, the coating’s pull back VISAR signals clearly evidence characteristic patterns according to the debonding or the integrity of the system. This shows the possibility to use this non‐intrusive diagnostic for assessing the bond quality of the coating. The numerical simulations of the experiments performed provide an estimate of the debonding parameters associated with a cumulative damage criterion for the interface of this system.