Accession Number : ADA302695

Title :   Visualization of Impact Damage of Composite Plates by Means of the Moire Technique.

Descriptive Note : Contract rept.,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Knauss, W. G. ; Babcock, C. D. ; Chai, H.

PDF Url : ADA302695

Report Date : APR 1980

Pagination or Media Count : 54

Abstract : The results of a program to determine the phenomenological aspects of the propagation damage due to low velocity impact on heavily loaded graphite-epoxy composite laminates are described. The main tool of this investigation is high speed photography coupled with the moire fringe technique. High speed moire' motion records of the impacted specimens are presented. The test results provide information on the time scale and sequence of the failure process. While the generation of the initial damage cannot always be separated temporally from the spreading of the damage, the latter takes place on the average with a speed on the order of 200 m/sec. (MM)

Descriptors :   *IMPACT STRENGTH, *TERMINAL BALLISTICS, *EPOXY LAMINATES, *GRAPHITE EPOXY COMPOSITES, COMPRESSION, DENSITY, PROJECTILES, DEFORMATION, DAMAGE ASSESSMENT, FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, COMPOSITE STRUCTURES, STRAIN(MECHANICS), STRENGTH(MECHANICS), LOW VELOCITY, PLATES, ALUMINUM, LIGHTWEIGHT, FAILURE(MECHANICS), POISSON RATIO, HIGH SPEED PHOTOGRAPHY, MOIRE EFFECTS.

Subject Categories : Laminates and Composite Materials
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE