Study of double step lap composite repairs on CFRP evaluators
Résumé
An innovative repair process and evaluation are proposed. Firstly, the originality of this work consists on the process used for the repair milling: an Abrasive Water-Jet milling. A doublestep lap coupon is chosen to demonstrate the feasibility of the milling process. This specimen is made of M10.1/38%/UD300 CHS 460 from Hexcel Composites. After milling, the removed material is reconstructed laying up the same prepreg material with a one-ply shift in the staking sequence. A Redux 609 adhesive film is used to ensure a correct bonding on the interface. Secondly, the originality concerns the mechanical characterization of the repair quality assessed through an innovative multi-axial mechanical test. It allows to choose multiaxial loadings according to the requirement. The selected test is a combined bending and compression test. Finally, results of mechanical tests are presented and discussed.