Influence of layup, stacking sequence and loading rate on energy absorption of tension-absorber joints

“Tension-absorber” joints are bolted designed to absorb energy in a survivable crash landing, through an extended version of bearing failure. They have been proposed for use future transport aircraft narrow-body composite fuselages. Herein, the influence layup (percentage each ply orientation), stacking sequence (exact location ply) and loading rate, on absorption is examined. Quasi-static dynamic (3 m/s) tests performed pin-loaded IM7/8552 carbon-fibre/epoxy laminates. Seven layups 11 sequences tested, with key variables being percentage 0° plies (from 12.5% 62.5%), position plies, changes orientation at interfaces. Performance measures include ultimate strength (UBS), mass-specific (SEA) crush load efficiency (CLE). Computed tomography used examine damage progression quasi-static tests. It found that most important factor maximising SEA having small This even more than content. A laminate only remarkably well due its low orientation. Laminates high tend UBS. Highest UBS was quasi-isotropic Increased rate results increased but decreased SEA. The allow selection desired combination SEA, provide valuable database validation composites models.