Accession Number : ADA301575

Title :   Contact Law and Impact Responses of Laminated Composites.

Descriptive Note : Interim rept.,

Corporate Author : PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Sun, C. T. ; Yang, S. H.

PDF Url : ADA301575

Report Date : FEB 1980

Pagination or Media Count : 122

Abstract : Static identation tests were performed to determine the law of contact between a steel ball and glass/epoxy and graphite/epoxy laminated composites. For both composites the power law with an index of 1.5 was found to be adequate for the loading curve. Substantial permanent deformations were noted after the unloading. A high order beam finite element was used to compute the dynamic contact force and response of the laminated composite subjected to the impact of an elastic sphere. This program can be used with either the classical Hertzian contact law or the measured contact law. A simple method has been introduced for estimating the contact force and contact duration in elastic impacts. (MM)

Descriptors :   *LAMINATES, *IMPACT STRENGTH, *GRAPHITE EPOXY COMPOSITES, VELOCITY, COMPUTER PROGRAMS, COMPOSITE MATERIALS, FINITE ELEMENT ANALYSIS, IMPACT TESTS, LOADS(FORCES), DEFORMATION, STIFFNESS, DAMAGE ASSESSMENT, DISPLACEMENT, ELASTIC PROPERTIES, MODULUS OF ELASTICITY, DEFLECTION, EIGENVALUES, STRAIN(MECHANICS), GLASS, BENDING, STEEL, LEAST SQUARES METHOD, KINETIC ENERGY, EPOXY COMPOSITES.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE