Accession Number : ADA189846

Title :   Fracture Toughness Testing of a Ceramic Matrix Composite.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Vozzola, Robert P

PDF Url : ADA189846

Report Date : Dec 1987

Pagination or Media Count : 105

Abstract : The need for an accurate fracture toughness testing technique for fiber reinforced ceramic composites was identified. A technique was developed to measure small crack mouth displacements over small gauge lengths of small glass-ceramic composite specimens during loading. The technique was applied to Mode II crack propagation. A loading fixture capable of exerting and measuring small loads was developed. A technique to measure compliances in small composite specimens was perfected. The validity of using a laser based interferometric technique to determine the instant of crack initiation was studied. Finally, the Mode II critical strain energy release rate of interlaminar delamination growth was evaluated. Sample results for a 1723 glass matrix, silicon carbide fiber composite are included and recommendations for further study are described.

Descriptors :   *CERAMIC MATERIALS, *FIBER REINFORCED COMPOSITES, COMPOSITE MATERIALS, CRACKING(FRACTURING), FRACTURE(MECHANICS), GLASS, INTERFEROMETRY, LASERS, SILICON CARBIDES, TEST AND EVALUATION, THESES, TOUGHNESS, ZIRCONIUM, NOTCH SENSITIVITY, STRAIN GAGES, ISOTROPISM, CRACK PROPAGATION, COMPUTER PROGRAMS

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE