Accession Number:

ADA220428

Title:

Fracture Mechanism Maps for Advanced Structural Ceramics. Part 1. Methodology and Hot-Pressed Silicon Nitride Results

Descriptive Note:

Final rept.

Corporate Author:

ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s):

Report Date:

1990-02-01

Pagination or Media Count:

35.0

Abstract:

The static fatigue behavior of advanced structural ceramics can be controlled by a variety of failure mechanisms. A fracture mechanism map can define the stress-temperature regimes where the different mechanisms are dominant. The static fatigue resistance of a hot-pressed silicon nitride with magnesia sintering aid is limited by slow crack growth or creep fracture, depending upon the specific stress-temperature conditions. The flexural fracture map is considerably refined relative to earlier versions, and in conjunction with available tension data, was used to create a tension fracture map. The fracture map brings together the findings of a number of studies and can be appreciated by materials scientists and engineers. jg

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE