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

摘要

The propagation of pulses in square bars of glass-epoxy fiber reinforced material was observed experimentally. The fiber orientation was varied from parallel to perpendicular to the bar's axis. Phase velocities were compared with those predicted from taking an effective Young's modulus for the bar. Geometric dispersion was considered by examining sinusodial vibrations of composite rods of circular cross-section. Dispersion curves were 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 were taken from oscilloscope records of free oscillations of the round composite rods. (Modified author abstract)