Mechanical Characterization of Disparate Material Systems
Abstract
Hybrid materials are replacing advanced monolithic materials in a growing number of applications where the unique properties and functionality of each constituent provides dramatically increased performance and life. Reliable high-temperature propulsion materials" are crucial to improved engine efficiency, reduced fuel costs and decreased life cycle costs. Thermal barrier coatings(TBC) for me"tallic Ni-based superalloys is one clear example of layered hybrid material systems that extend the performance of monolithic materi"als in extreme environments, consisting of high stresses and oxidizing and corrosive gases at temperatures on the order of 1500oC. W""ith ongoing ONR support, we have recently developed and are now employing novel experimental approachesto measuring both the consti"tutive properties of individual layers and the interfacial toughness that binds the layers together. Realization of the compression edge-delamination (CED) test for measuring the mode-II delamination toughness will allow the PI and his students to collaborate wit"h scientists and engineers at two of the Navy~s prime jet engine manufacturers, General Electric and Pratt and Whitney. CED specimen"s will be made from laboratory specimens and engine hardware and tested in the as-deposited condition as well as after exposure to various forms of thermal cycle testing. The results obtained will provide much needed interfacial toughness datafor TBC modeling and" lifeing efforts and facilitate identification of deleterious failure mechanisms. Moreover, having direct comparisons of a variety o"f test samples will provide a much-desired benchmark for discerning the efficacy of the various laboratory tests that are being used to predict TBC performance.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 26, 2018
- Source ID
- N000141812180
Entities
People
- Kevin Hemker
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy