Accession Number : AD0779481

Title :   Plasticity Theory of Fibrous Composites - Part II.

Descriptive Note : Interim technical rept. no. 4,

Corporate Author : DUKE UNIV DURHAM N C DEPT OF CIVIL ENGINEERING

Personal Author(s) : Rao,M. S. Madhava ; Dvorak,George J.

Report Date : DEC 1973

Pagination or Media Count : 42

Abstract : This is the second of a three-part study of the plastic deformation of unidirectional fibrous composites made of isotropic, linearly elastic fibers, and an elastic- plastic, non-hardening matrix of the Mises type. The results obtained in the first part for the case of axisymmetric loading of the composite are extended and refined. A new kinematic Hardening Rule II is derived, and an associated flow rule is formulated. An approximate method for the evaluation of the microstresses in the composite is described. The theory is verified by comparison with exact, finite element plasticity solutions for a composite cylinder model of the Be-Al, and B-Al systems. The agreement between the approximate and exact results is very satisfactory. (Author-PL)

Descriptors :   *Fiber reinforced composites, *Plastic deformation, Axisymmetric, Aluminum, Boron, Beryllium, Fibers, Loads(Forces), Hardness, Stress strain relations

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE