Accession Number:

ADA386812

Title:

Reliable Ceramic Structural Composites Designed with Threshold Strength

Descriptive Note:

Technical rept. for 1 May 2000-30 Apr 2001

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS

Personal Author(s):

Report Date:

2001-04-30

Pagination or Media Count:

10.0

Abstract:

A stress intensity K function describing the extension of a crack through bounding compressive layers has been experimentally verified using two methods. For one method the crack length was measured using a replicating technique in the other, the crack length was continuously measured in-situ with an optical microscope during loading. In both, cracks were observed to propagate in a stable, nearly straight path across the compressive layer with increasing applied stress. Catastrophic failure was observed when the crack fully extended across the compressive layers at an applied stress predicted and described as the threshold stress. This behavior and agreement was only valid when either the compressive stress andor thickness of the compressive layer were small.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE