Accession Number : AD0785519

Title :   Effect of Loading Rate on Crack Growth in Glass-Epoxy Sheet.

Descriptive Note : Technical rept.,


Personal Author(s) : Kendall,D. P.

Report Date : AUG 1974

Pagination or Media Count : 13

Abstract : The effect of loading rates ranging from 1,000 to 10,000,000 pounds per second on the crack growth resistance of multi-directional laminates of glass-epoxy has been determined. The results reported are the instantaneous stress intensity factors for crack extensions of 0.1 and 0.2 inches. A 60 per cent in-crease in crack growth resistance is obtained for a loading rate increase from 10,000 to 10,000,000 pounds per second. A modified 6strain compliance6 technique, based on the ratio of strain at a given point to the applied load, is used to obtain a measurement of crack extension under dynamic loading. (Author, modified-PL)

Descriptors :   *Fiber reinforced composites, *Fracture(Mechanics), *Crack propagation, *Laminates, Strain rate, Loads(Forces), Fiberglass, Measurement, Test methods

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE