Accession Number : ADA302008

Title :   Ultrasonic Stress Wave Characterization of Composite Materials.

Descriptive Note : Contract rept.,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Duke, John C., Jr. ; Henneke, Edmund G., II ; Stinchcomb, Wayne W.

PDF Url : ADA302008

Report Date : MAY 1986

Pagination or Media Count : 162

Abstract : The work reported covers three simultaneous projects. The first project was concerned with (1) establishing the sensitivity of the acousto-ultrasonic method for evaluating subtle forms of damage development in cyclically loaded composite materials, (2) establishing the ability of the acousto-ultrasonic method for detecting initial material Imperfections that lead to localized damage growth and final specimen failure, and (3) characteristics of the NBS/Proctor sensor/receiver for acousto-ultrasonic evaluation of laminated composite materials. The second project was concerned with examining the nature of the wave propagation that occurs during acousto-ultrasonic evaluation of composite laminates and demonstrating the role of Lamb or plate wave modes and their utilization for characterizing composite laminates.

Descriptors :   *FIBER REINFORCED COMPOSITES, *STRESS WAVES, FIBER OPTICS, NONDESTRUCTIVE TESTING, STRESS ANALYSIS, OPTICAL DETECTION, TENSILE STRESS, STIFFNESS, DAMAGE ASSESSMENT, ACOUSTIC DETECTION, STRENGTH(MECHANICS), CRACK PROPAGATION, DEFECTS(MATERIALS), ULTRASONICS, WAVE PROPAGATION, EPOXY LAMINATES, ACOUSTIC SIGNALS, FATIGUE(MECHANICS), FAILURE(MECHANICS), ACOUSTIC EMISSIONS, PLANE WAVES, AXIAL LOADS, CYCLIC LOADS, MICHELSON INTERFEROMETERS, GRAPHITE EPOXY COMPOSITES, PIEZOELECTRIC TRANSDUCERS.

Subject Categories : Laminates and Composite Materials
      Mechanics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE