Accession Number : ADA193204

Title :   Analysis of Transverse Strength of Composites Using Percolation Theory.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA MATERIALS SCIENCES LAB

Personal Author(s) : Feldman, Leslie A ; Bhader, Thomas B ; Hawkins, Gary F

PDF Url : ADA193204

Report Date : 15 Feb 1988

Pagination or Media Count : 19

Abstract : As the fiber content is increased in order to increase the tensile strength of a unidirectional metal matrix composite, the transverse strength decreases rapidly. This is caused by a combination of low transverse fiber strength and weak fiber/matrix bond strength. Percolation theory, which has been used to describe phenomena that involve phase transitions and that can be modeled as a number of particles interacting with a random medium, has been used here to show that low transverse fracture strengths may be expected as the fiber content of a unidirectional composite is increased. This increase results in connected chains of fibers, weakly bonded to each other and to the matrix. The expected strength is lower in this case than is predicted by a simple regular array of holes model. Keywords: Composites, Mechanical strength, Percolation theory, Transverse strength of composites.

Descriptors :   *STRENGTH(MECHANICS), *METAL MATRIX COMPOSITES, ARRAYS, CHAINS, FRACTURE(MECHANICS), LOW STRENGTH, METAL MATRIX COMPOSITES, PARTICLES, PERCOLATION, PHASE TRANSFORMATIONS, TENSILE STRENGTH, THEORY, TRANSVERSE, UNIDIRECTIONAL, CARBON FIBERS, MATHEMATICAL MODELS, ALUMINUM, GRAPHITE

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE