Accession Number : AD0776402

Title :   An Experimental Investigation of Stress Waves in Rods of a Fiber-Reinforced Composite.

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF APPLIED MATHEMATICS

Personal Author(s) : Arseneaux,Peter J. , Jr

Report Date : JUN 1973

Pagination or Media Count : 68

Abstract : This work aims at observing and measuring phase velocity, attenuation, and dispersion of stress waves in fiber-reinforced rods by the generation of longitudinal waves. The propagation of pulses in square bars of glass-epoxy fiber reinforced material is observed experimentally. Fiber orientation is varied from parallel to perpendicular to the bar's axis. Phase velocities are compared with those predicted from taking an effective Young's modulus for the bar. Geometric dispersion is considered by examining sinusoidal vibrations of composite rods of circular cross-section. Dispersion curves are predicted based on a lateral inertia correction and measured using a resonance method. The experimental results are not very extensive but nevertheless sufficient for qualitative conclusions to be advanced. Damping measurements are taken from oscilloscope records of free oscillations of the round composite rods. Again the results are not as complete as desired, but some conclusions can be drawn. (Author, modified-PL)

Descriptors :   *Glass reinforced plastics, *Fiber reinforced composites, *Stresses, Wave propagation, Rods, Anisotropy, Elastic properties, Fibers, Alignment

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE