Fracture Behavior of Boron Aluminum Composites at Room and Elevated Temperatures.
Abstract
This report describes the results of research work on the deformation characteristics and failure mechanisms and processes of center-notched boron/aluminum laminates at room and elevated temperatures. This program has focused on the deformation characteristics in both the elastic and inelastic ranges, crack tip damage growth, notch sensitivity, toughness, failure mechanisms and processes and failure modes. The primary experimental technique has been to utilize the interferometric displacement gage (IDG) through which the actual crack opening displacement (COD) could be measured at room and elevated temperatures, resulting in precise load-COD and local compliance curves. Special attention has also been given to nondestructive examination techniques, in particular the acoustic emission technique, for monitoring internal damage initiation and progression during quasi-static and low cycle fatigue loading. Microstructural studies of the fracture surface morphologies have been conducted as well. The experimental studies contributed to the understanding of the effect of laminate configuration and test temperature on the fracture behavior of the subject material. The analytical study has focused in three major directions, namely: (1) predicting the elastic behavior; (2) application of semi-empirical fracture models for predicting the notch sensitivity; and (3) application, extension and modifications of approximate mechanistic models for predicting the deformation characteristics of unidirectional composites. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1985
- Accession Number
- ADA162352
Entities
People
- Jonathan Awerbuch
Organizations
- Drexel University