Characterization of Elastic Properties of Interfaces in Composite Materials
Abstract
The Strategic Defense Initiative Organization has place d a great deal of emphasis on the development on new composite materials, specifically metal and ceramic matrix composites. These types of composite materials offer the advantages of being lighter, stiffer, stronger, and more resistant to creep and corrosion. However, because of physical and chemical differences of the matrix and reinforcing agents the interface is plagued by chemical reactions and a high level of residual stress. This impedes the ability of the interface to bear and transfer load and results in fracture upon subsequent loading. Thus, the need for nondestructive characterization of interfaces is critical to the development of these high technology composite materials. Feedback from a nondestructive interface characterization technique is also critical to the further development and refinement of the materials processing procedures. The goal of the Johns Hopkins University program was to study these characteristics and develop techniques which utilize interface waves for nondestructive evaluation of composite interfaces. This final report summarizes the results of two projects which examined the use of interface waves for nondestructive evaluation of composite interfaces. The first project focused on Stoneley waves and their sensitivity to interfacial bond quality and microstructural changes. The second project focused on the use of leaky waves for the nondestructive characterization of interfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1990
- Accession Number
- ADA228119
Entities
People
- E. A. Lindgren
- K. A. Hirshman
- Michelle Rosen
- T. M. Hsieh
Organizations
- Johns Hopkins University