Accession Number : ADD013548

Title :   Method for Measuring Material Characteristics.

Descriptive Note : Patent, Filed 28 Aug 82, patented 6 Dec 83,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Madigosky, Walter M ; Lee, Gilbert F

Report Date : 06 Dec 1983

Pagination or Media Count : 8

Abstract : A fast and reliable method is disclosed for measuring the dynamic mechanical properties of a material, particularly its modulus of elasticity and loss factor. By this method the acoustic characteristics of a material can be determined. An elongate strip of material, whose properties are desired to be known, is provided with miniature accelerometers fixedly secured to its opposite ends. One end of the strip is excited by a random noise source which travels toward the other end where that end and accelerometers measures the ratios of acceleration at two locations over an extended frequency range of 0.2 Hz to 25 KHz, and the information is processed through a fast fourier transform spectrum analyzer for determining amplitude of acceleration ratio and phase difference between the two accelerometers from which Young's modulus and loss factor for that material are determined.

Descriptors :   *DYNAMICS, *MATERIALS, *MECHANICAL PROPERTIES, *MODULUS OF ELASTICITY, ACCELERATION, ACCELEROMETERS, ACOUSTIC PROPERTIES, AMPLITUDE, BANDS(STRIPS), FREQUENCY, LOSSES, MEASUREMENT, MINIATURIZATION, NOISE, PATENTS, POSITION(LOCATION), RATIOS, RELIABILITY, SOURCES, TRAVEL, MATERIALS, PATENTS

Subject Categories : Miscellaneous Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE