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Development of the symmetrical laser shock test for weak bond inspection

: Sagnard, M.; Berthe, L.; Ecault, R.; Touchard, F.; Boustie, M.; Brune, K.


Chau, R. ; American Physical Society -APS-:
Shock compression of condensed matter, SCCM 2017. Proceedings : St. Louis, MO, USA, 9-14 July 2017
Melville/NY: AIP Publishing, 2018
ISBN: 978-0-7354-1693-2
Topical Conference on Shock Compression of Condensed Matter (SCCM) <20, 2017, St. Louis/Mo.>
Conference Paper
Fraunhofer IFAM ()

This paper presents the LAser Shock Adhesion Test (LASAT) using symmetrical laser shocks. The study is part of ComBoNDT European project that develops new Non-Destructive Tests (NDT) to assess adherence properties of bonded composite structures. The technique, its principle, and the experimental setup are first presented. To evaluate the technology, a various contaminated CFRP assemblies are tested using the LASAT. For each case, their bonding strength is discriminated from a reference bonding strength. If the results are promising, they also rise a lot of questions concerning the state of the material post laser shot. A series of photomicrographs of tested areas are performed showing how the contamination impacts the crack propagation pattern. The study concludes on the technology capability to differentiate a correct assembly from a contaminated one.