Accession Number : AD0779480

Title :   Plasticity Theory of Fibrous Composites - Part I.

Descriptive Note : Interim technical rept. no. 3,

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

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

Report Date : DEC 1973

Pagination or Media Count : 39

Abstract : Plastic deformation was studied in unidirectional fibrous composites made of isotropic, linearly elastic fibers, and an elastic-plastic, nonhardening matrix of the Mises type. Special attention was given to the effects of axisymmetric stress states. The composite exper-ienced kinematic hardening when loaded by axisymmetric composite stresses. A simple Hardening Rule I was derived and an associated flow rule was formulated. The results obtained from these rules were verified by comparison with exact finite element plasticity solutions for a cylindrical composite model of the B-A SYSTEM. Significant plastic macro-dilitation was found for certain loading directions in the axisymmetric composite stress plane. (Author, modified-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