The first results of the COMPOCHOC project, coordinated by RESCOLL, presented in the COFREND Days 2017Rescoll'Blog / 30 juin 2017
Non-Destructive Evaluation of the mechanical strength of a TA6V4-Composite bonding using LASAT.
In the current context of aircrafts' weight reduction and considering the trend for lowering production and maintenance-related costs, aeronautics industry promotes the use of adhesive bonds to replace mechanical fasteners. However, the main limitation of structural bonding into aircraft industry concern the ability to certify in a non-invasive way the good quality of a structural bonding, i.e. to certify that the bonding can resist up to a predefined strength value. Conventional Non-Destructive Testing (NDT) techniques allow disbonding detection but are inefficient to evaluate bond mechanical strength, i.e. weak bonds detection. The LASer Adhesion Test (LASAT)  is seen as a promising alternative to classical NDT techniques in order to reveal those weak bonds in a reproducible and automated way. It aims to apply calibrated mechanical stresses to a given bonded assembly using laser-induced shock waves. This calibrated configuration should lead to disbonding of the joint/substrate interface in case of a weak bond and should not damage a healthy bond. Previous studies demonstrated the ability of the LASAT technology to characterize the quality of composite/composite bonded assemblies on typical operational thicknesses . In this work, LASAT is applied to two levels of adhesive bond mechanical strength for a TA6V4/3D woven carbon/epoxy composite assembly. We will show the potential of this technology for such configuration.
To download the public article: Compochoc