Nondestructive Inspection of Reinforced Plastic Structures by the Nuclear Quandrupole Resonance Method

摘要

The work reported here is directed toward the investigation of the use of the nuclear quadrupole resonance response of tracer quantities of inert fillers in resins and reinforced polymer structures as a nondestructive testing technique. The strain-sensitive response of nuclear quadrupole resonance has been used to detect defects in idealized test specimens and to measure the strain response of polymer specimens at a microscopic level. The tracer material used in this project was cuprite, Cu2O, in a reagent grade powder form; the polymer used was Epon 828catalyzed with Versamid 140. Some test specimens were fabricated with the straight resin doped with cuprite, and others were made with a glass laminate reinforced structure of the doped resin. Some glass reinforced specimens were fabricated with defects; these defects were detected by the NQR response. The effect of mechanical degradation, induced by cyclic loading, was also observed in the NQR response. (Author)