Accession Number : ADA186941

Title :   Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites.

Descriptive Note : Interim technical rept. 31 Jul-31 Oct 87,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Davidson, D L

PDF Url : ADA186941

Report Date : Nov 1987

Pagination or Media Count : 28

Abstract : Fracture toughness of several composites of aluminum alloys reinforced with particulate SiC have been measured. Variables were particulate size and volume fraction, and matrix alloy composition and heat treatment. Fracture surface profiles were measured and related to fractile dimension using the techniques of quantitive metallography. Fracture surface roughness was described well by fractals, but fracture toughness did not correlate with any measure of fracture roughness. An explanation for this behavior is offered. Keywords: Metal matrix composites, Silicon carbide reinforcement, Fatigue crack growth, Fracture toughness, Particulate strengthening, Crack growth micromechanisms.

Descriptors :   *CRACK PROPAGATION, *FRACTURE(MECHANICS), *METAL MATRIX COMPOSITES, *TOUGHNESS, FATIGUE(MECHANICS), HEAT TREATMENT, MATRIX MATERIALS, PARTICULATES, ROUGHNESS, SILICON CARBIDES, SIZES(DIMENSIONS), STRENGTH(MECHANICS), SURFACE ROUGHNESS, SURFACES

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE