Structure-Properties Relations in Titanium-Based Thermoplastic Fiber-Metal Laminates

摘要

This paper investigates the interfacial,tensile,and fatigue properties of a titanium alloy fiber-metal laminate (Ti-FML)based on woven glass-fiber-reinforced poly-etherimide (GF/PEI).Initial tests,using the single cantilever beam (SCB)geometry have shown that it is not necessary to surface treat the titanium alloy in order to achieve a high value of metal-composite interfacial fracture toughness.Tensile tests have shown that the mechanical properties of the FML lie between those offered by its constituent materials.Tension-tension fatigue tests have shown that the fatigue lives of these laminates are superior to those offered by the plain titanium alloy.The mechanical properties of this glass fiber/PEI FML have also been compared with those offered by an FML based on a unidirectional carbon-fiber-reinforced polyetheretherketone (CF/PEEK)composite.Here,it has been shown that although the fatigue properties of this woven GF/PEI composite are inferior to those of the CF/PEEK FML,they do offer a higher temperature capability due to the higher glass transition temperature of the PEI matrix.