Accession Number : AD0773169

Title :   Studies on the Viscoelastic Behavior of Fiber-Reinforced Plastic.

Descriptive Note : Final rept. 1 Jan 69-31 Dec 72,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS RESEARCH CENTER

Personal Author(s) : Schapery,R. A. ; Beckwith,S. W. ; Conrad,N. W.

Report Date : JUL 1973

Pagination or Media Count : 137

Abstract : A model for microcrack growth in viscoelastic fibrous composites is developed and incorporated into a viscoelastic constitutive theory. The applicability of this crack propagation analysis for predicting the influence of stress history on failure of composites is then examined. Mechanical behavior of a unidirectional graphite fiber-reinforced epoxy is characterized in terms of the separate effects of constant and transient temperatures, fiber angle, single and multiple cycle loading, and stress level. The nature of the microstructure and a possible crack arrest mechanism are shown in micrographs obtained with a scanning electron microscope. (Author, modified-PL)

Descriptors :   *Composite materials, Viscoelasticity, Reinforced plastics, Epoxy resins, Epoxy compounds, Matrix materials, Carbon fibers, Graphite, Fibers, Fiber reinforcement, Crack propagation

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE