Accession Number:

ADA162352

Title:

Fracture Behavior of Boron Aluminum Composites at Room and Elevated Temperatures.

Descriptive Note:

Final rept. 1 Apr 79-14 Apr 85,

Corporate Author:

DREXEL UNIV PHILADELPHIA PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS

Personal Author(s):

Report Date:

1985-04-01

Pagination or Media Count:

265.0

Abstract:

This report describes the results of research work on the deformation characteristics and failure mechanisms and processes of center-notched boronaluminum 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

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE