Accession Number : AD0616746

Title :   AN EXPERIMENTAL DETERMINATION OF ULTRASONIC LONGITUDINAL WAVE VELOCITIES THROUGH NOSE CONE MATERIALS AT SEVERAL TEMPERATURES AS A FUNCTION OF LAMINATION ANGLE.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Dorr,Anton John

Report Date : JUN 1965

Pagination or Media Count : 72

Abstract : Ultrasonic longitudinal wave velocities of nose cone materials were measured as a function of the lamination angle at several temperatures between 25C and 125C. Wave velocity at 3 Mc was obtained by measuring directly the transit time through a sample and dividing into the measured sample thickness. A maximum wave velocity uncertainty of 1.5% was obtained. It was found that the longitudinal wave velocity vs lamination angle curve maintains the same shape (for a given material) for temperatures between 25C and 125C. Furthermore, it was found that the wave velocity vs lamination angle curve can be predicted to within 2 1/2% by an empirical equation involving only the lamination angle; c(0 degrees), the measured wave velocity at an angle of 0 degrees; and c(90 degrees), the measured wave velocity at an angle of 90 degrees. Finally, it was found that the longitudinal wave velocity of certain materials varies as much as 25% between lamination angles of 0 degrees and 90 degrees, while other materials show less or no variation at all. (Author)

Descriptors :   (*NOSE CONES, LAMINATES), (*LAMINATES, ULTRASONIC RADIATION), (*ULTRASONIC RADIATION, NOSE CONES), PHENOLIC PLASTICS, NYLON, GLASS TEXTILES, VELOCITY, EQUATIONS OF STATE, TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE