An investigation of Polyether Imide (PEI) toughening of carbon fibre-reinforced Polyether Ether Ketone (PEEK) laminates

• PEI film inclusions improve the Mode I and II interlaminar toughness performance of CF/PEEK laminates. laminates toughened with at delamination susceptible ply interfaces exhibited superior impact relative to baseline a smaller damage footprint Unlike thermoset based composite laminates, all tested on surface. This is useful attribute in aerospace structures, where barely visible (BVID) concern for flight safety. Current material systems have relatively low fracture toughness, leaving them vulnerable damage. While thermoplastic are considered be tougher, levels can dependent processing parameters. In this study, Polyether imide (PEI) layers were added carbon fibre-reinforced ether ketone (CF/PEEK) laminate layups prior consolidation enhance key interfaces. It was found that addition improves laminate. Low-velocity tests performed as well PEEK inserts, direct thickness comparison. For energy impacts (10 J), associated tool drop events, it panel best. However, difference decreased increased. Ultrasonic scans indicated footprint. Compression after (CAI) Combined Loading (CLC) revealed although inserts reduce undamaged compressive strength, they higher residual strengths compared other tested.