Ultrasonic Attenuation as an Indicator of Fatigue Life of Granite/epoxy Fiber CompositeNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1979 - Quality control - 20 pages |
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Common terms and phrases
2.0 MHz appears alternately compression-compression AS/3501-6 graphite fiber attenuation and velocity attenuation measurements Beth Doll C-C Fatigue compression-compression fatigue compressive fracture stress cycles to failure cycles to fracture failure for specimens fatigue damage fatigue failure fatigue fractures occurred fatigue limit fatigue strength Fatigue Tests fiber epoxy composites graphite fiber composites graphite fiber epoxy GRAPHITE/EPOXY FIBER COMPOSITE group velocity Hercules AS/3501-6 graphite increase in attenuation INDICATOR OF FATIGUE initial attenuation values Input Laminate fabri Lewis Research Center Massachusetts measuring experimental system MHz and 2.0 MHz versus cycles Microscopic imperfections narrow band NASA neper/cm number of fatigue peak-to-peak Performing Organization precure temperature prefatigued static compressive shear strength Specimen 202 specimens from laminate static compressive fracture static fracture stress static strength temperature of 177°C tested at 0.80 Transducer transducer-specimen interface transfiber compression-compression uation ULTRASONIC ATTENUATION ultrasonic longitudinal wave unidirectional graphite epoxy velocity and attenuation velocity measuring experimental versus fatigue cycles Wave Propagation