Wave Propagation in Fiber Composite Laminates. Part 2.
Abstract
An experimental investigation was conducted to determine the wave propagation characteristics, transient strains and residual properties in unidirectional and angle-ply boron/epoxy and graphite/epoxy laminates impacted with silicone rubber projectiles at velocities up to 250 m per sec (820 ft/sec). The predominant wave is flexural, propagating at different velocities in different directions. In general, measured wave velocities were higher than theoretically predicted values. The amplitude of the in-plane wave is less than ten percent of that of the flexural wave. Peak strains and strain rates in the transverse to the (outer) fiber direction are much higher than those in the direction of the fibers. Strain rates up to 640 E/sec were measured. The dynamics of impact were also studied with high speed photography. The projectile is completely flattened within 50-70 microns. The total contact time is of the order of 300 microns. (AN)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA305292
Entities
People
- I. M. Daniel
- T. Liber
Organizations
- IIT Research Institute