Blister test has known a huge development in the 90's to study thin films. Indeed, this test allows, in one single experiment, to measure different mechanical properties of thin film on substrate: elastic modulus, residual stress and adhesion to the substrate.
In its principle, the test consists in applying a fluid pressure on one side of a freestanding film window through a hole in the substrate. As the name indicates, the bulge-and-blister test is divided in two steps:
Our set-up consists of a pressurizing block filled with an incompressible fluid (DI water). A micrometric screw piston and a syringe pump were used to inject water towards the specimen, while the internal pressure was measured thanks to a piezoelectric sensor. Two systems are used to measure the blister geometry:
Rédigé par Sabine Lay
mise à jour le 25 novembre 2018