Accession Number:

ADA280368

Title:

Interaction Effects of Cracks, Flaws and Damage in Ceramic

Descriptive Note:

Final rept. Sep 1992-Mar 1994

Corporate Author:

NEW MEXICO UNIV ALBUQUERQUE

Personal Author(s):

• Schreyer, Howard L.
• Wang, Ming L.

Report Date:

1994-05-04

Pagination or Media Count:

101.0

Abstract:

It is generally recognized that the nature of grain boundaries and microstructures affects the properties and behavior of ceramics. One of the objectives of this research is to study the fracture process of the ceramic in real time and to measure the strain field in the vicinity of the crack including the bridging zones. A fast-scanning electron microscope FSEM for dynamic microscopy applications was used to capture the fracture events in the ceramic. This equipment captures images at high speed. The SEM chamber was also modified to accommodate an in-situ tension-compression loading device to fracture ceramics. The fracture mode was predominantly intergranular. No indication of a microcrack-cloud zone was observed in the FSEM results. Grain bridging was observed along the entire crack interface and over the entire propagation distance. Grain boundaries, Microstructures.

Descriptors:

• *CRACKING(FRACTURING)
• *FRACTURE(MECHANICS)
• *CERAMIC MATERIALS
• *DEFECTS(MATERIALS)
• COMPRESSION
• VELOCITY
• SCANNING ELECTRON MICROSCOPES
• MICROSTRUCTURE
• REAL TIME
• DAMAGE ASSESSMENT
• MICROSCOPY
• MICROCRACKING
• ALUMINATES
• GRAIN BOUNDARIES
• TENSION
• IMAGES
• BRITTLENESS
• CRACK PROPAGATION
• MESH
• STRAIN(MECHANICS)
• ELECTRON MICROSCOPES
• CRACKS
• INTERACTIONS
• INTERFACES
• FINITE ELEMENT ANALYSIS
• DEFORMATION

Subject Categories:

• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE