Investigation of Compressive Behavior for Metal Matrix Composites with a Circular Hole
Abstract
This study investigated the notched and unnotched macromechanical response due to micromechanical behavior of O/+/-45/90 sub s SCS-6/beta 21 S and 0/90)2 sub S Sigma/Beta 21S subjected to static compressive loads at room temperature. The stress-strain behavior and mechanical response in the presence of a circular hole was examined. A clear description of the progressive nature of damage, which ultimately resulted in failure, was provided. The effect of elevated temperature was shown for SCS-6/Beta 21S. The ultimate compressive strength and elastic modulus were reported for both MMCs. Sigma/Beta 21S and SCS-6/Beta 21S were mildly notch sensitive at room temperature. Notch sensitivity of SCS-6/Beta 21S was slightly reduced at 650 deg C. Internal failure mechanisms of fiber debonding, matrix cracking, matrix yielding, fiber failure, and fiber microbuckling were observed in various combinations during the loading. Damage mechanisms were observed similarly in notched and unnotched specimens. Damage initiation in the notched specimens was concentrated in the region adjacent to the hole. Sigma/Beta 21S and unnotched SCS-6/Beta 21S at room temperature failed in an extensional mode, while notched SCS-6/Beta 21S and unnotched SCS-6/Beta 21S at 650 deg C failed in a shear mode. The ultimate compressive failure of each depended on the ultimate strength of the fibers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1993
- Accession Number
- ADA273835
Entities
People
- Janet L. Gooder
Organizations
- Air Force Institute of Technology