Interphase Thermomechanical Reliability and Optimization for High-Performance Ti Metal Laminates
Abstract
Hybrid laminated composites such as titanium-graphite (TiGr) laminates are an emerging class of structural materials with the potential to enable a new generation of efficient, high-performance aerospace structures. By combining the property sets of dissimilar materials, a synergistic set of properties can be realized. Critical to performance and reliability is the durability of the adhesive interphases between the dissimilar layers. Our program has developed new and superior ways of making highly effective bonds of the metal oxide/epoxy interfaces in such hybrid laminates that are critical to their performance. We achieved this by developing a mixed metal/epoxysilane sol-gel hybrid coupling layer. These hybird materials exhibit excellent properties but there was a deficiency in understanding the fundamental mechanisms behind their performance and reliability. To this end our program also sought to provide the fundamental characterization of the thermomechanical properties of the hybrid layers and the interphase region using a number of new and unique thin-film mechanical and fracture characterization methods. We developed physics and chemical reaction rate models together with computational methods to model the hybrid molecular structure and resulting mechanical and fracture properties. The program supported 4 doctoral students, two have graduated with PhD's and two are still in progress. The program resulted in a number of technical publications and invited and contributed talks at international conferences. The knowledge developed in the program offers the possibility to engineer, at the molecular level, the hybrid layers in laminated composites for improved thermomechanical reliability.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 19, 2011
- Accession Number
- ADA563164
Entities
People
- Anay Kamer
- Jeffrey Yang
- Linying Wang
- Mark Oliver
- Reinhold H. Dauskardt
Organizations
- Stanford University