Fatigue Fracture Analysis and Development of Fundamentals of Predictive NDE of Adhesive Composite Joints
Progress rept. 1 Sep 2002-31 Aug 2003
NEBRASKA UNIV LINCOLN
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The objectives of this project are to study durability and damage and fracture development in adhesive composite joints for aerospace structural applications and to develop methods of their intelligent nondestructive evaluations and life prediction. In the third reporting period, the focus was on the development of robust methods of quantitative nondestructive evaluation of crack length and loading mode mixity needed for life prediction in conjunction with the previously developed models of fatigue fracture in joints. Methods of vibrational spectroscopy, acousto-ultrasonics, and acoustic emission location analysis were evaluated experimentally. Dynamic models of wave propagation were developed and used for improved data reduction. A new method of through-thickness interrogation was developed and studied. Specimens with embedded sensors were manufactured and tested. Work has continued on the evaluation of the new composite provided by AFRL. New analytic models were developed for advanced fracture analysis of advanced laminated composites and joints.
- Adhesives, Seals and Binders