Accession Number : ADA304420

Title :   Microplastic Deformation of Fibrous Composites. Solid Mechanics Series Number 11.

Descriptive Note : Final rept.,

Corporate Author : DUKE UNIV DURHAM NC DEPT OF CIVIL ENGINEERING

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

PDF Url : ADA304420

Report Date : SEP 1974

Pagination or Media Count : 257

Abstract : This is a two-part study on the plastic deformation of the fiber-reinforced metal matrix composites. In the first part of the study, a plasticity theory is formulated to predict analytically the macroscopic and microscopic responses of the unidirectional fiber-reinforced metal matrix composites, loaded by axisymmetric composite stress states. The composites are made of isotropic, linearly elastic fibers, and elastic-plastic, nonhardening matrix of Mises type, and are assumed to be both plastically extensible and compressible. It is shown that the unidirectional composites experience kinematic hardening when loaded by axisymmetric composite stresses. The hardening and flow rules governing the kinematic hardening are formulated. The results obtained by the hardening and flow rules are compared with exact plasticity solutions based on the finite element method. A very good agreement is obtained both for proportional and general loading regimes. An approximate method for the determination of microstresses in the unidirectional Composites under axisymmetric loading is described. jg p4

Descriptors :   *PLASTIC DEFORMATION, *FIBERS, *COMPOSITE MATERIALS, *FIBER REINFORCED COMPOSITES, *METAL MATRIX COMPOSITES, KINEMATICS, STRESSES, FINITE ELEMENT ANALYSIS, ELASTIC PROPERTIES, ISOTROPISM, AXISYMMETRIC, PLASTIC PROPERTIES, FLOW, HARDENING, COMPRESSIVE PROPERTIES, UNIDIRECTIONAL.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE