Damage evolution in quasi-isotropic SCS-6/timetal 21S under quasi-static and dynamic bending

摘要

Damage initiation and evolution in SCS-6/Timetal 21S with quasi-isotropic layup loaded under quasi-static and dynamic bending is investigated. When the axes of the fibers inthe outer ply are transverse to the bending stress ([90/+-45/0)]_s layup), the bending strength is significantly lower and damage in the form of fiber-matrix separation initiates sooner than when the fibers in the outer ply are parallel to the bending stress ([0/+-45/09]_s). The damage process and plasticity for dynamic bending is similar to quasi-static bending with the asymptotic damage level being the same for both. However, the rate of increase of damage with strain is smaller for dynamic bending compared to quasi-static bending. The energy dissipated in this titanium matrix composite under dynamic loading is smaller than either a graphite-fiber polymide-matrix composite or a glass-fiber bismaleimidematrix composite.