Accession Number : AD0764628

Title :   Impact Studies of Polymeric Matrices.

Descriptive Note : Final rept. 3 Jan 72-2 Feb 73,

Corporate Author : GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y

Personal Author(s) : Hillig,William B.

Report Date : MAR 1973

Pagination or Media Count : 83

Abstract : The report is concerned with measuring, analyzing, and ultimately predicting the response and damage that results when a hard object of known mass, velocity, and curvature strikes the semi-infinite materials such as PMMA, polycarbonate and epoxy. The capability for precise velocity control of 4.5 mm diameter steel projectiles to at least 1000 ft/sec is developed and processing of stress-pulse signal to determine initial pulse shape is described. Relaxation, strain-hardening, and a subsequent accelerated strain relaxation are observed in PMMA. The latter process was not detected in polycarbonate. The epoxy shows only relaxation. Low velocity impact provides a sensitive mechanical 'fingerprint' of the materials and serves as a useful base for investigating higher velocity impacts. (P.S.-PL)

Descriptors :   (*PLASTICS, *IMPACT TESTS), (*EPOXY RESINS, IMPACT TESTS), ACRYLIC RESINS, TEST METHODS, THICKNESS, VISCOELASTICITY, NUMERICAL ANALYSIS, COMPUTER PROGRAMS

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE