Controlled Crack Growth Specimen for Brittle Systems
Abstract
A pure Mode I fracture specimen and test procedure has been developed which provides extended, stable, through-thickness crack growth in ceramics and other brittle, nonmetallic materials. Fixed displacement loading, applied at the growth mouth, promotes stable crack extension by reducing the stored elastic strain energy. Extremely fine control of applied displacements is achieved by utilizing the Poisson's expansion of a compressively loaded cylindrical pin. Stable cracks have been successfully grown in soda-lime glass and monolithic Al203 for lengths in excess of 20 mm without uncontrollable catastrophic failure.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1990
- Accession Number
- ADA227150
Entities
People
- Anthony M. Calomino
- David N. Brewer
Organizations
- National Aeronautics and Space Administration