Al-NiTi Metal Matrix Composites for Zero CTE Materials: Fabrication, Design, and Modeling
Al-NiTi composites fabricated via ultrasonic additive manufacturing (UAM) provide a light-weight solution for low thermal expansion applications. It is shown that the thermal expansion of Al 6061 can be reduced by over 50% by incorporating a 13% volume fraction of NiTi fibers. This reduction in thermal expansion occurs from the contraction of the NiTi fiber during heating, thereby offsetting the thermal expansion of the Al matrix. Al-NiTi composites are made possible by low temperature UAM process. Successful implementation of these composites requires a careful design approach that includes the processing characteristics as well as the thermo-mechanical response of the shape memory fibers and matrix. This is achieved using a NiTi microstructure based FEA model implemented that captures the underlying thermomechanical response of the NiTi fibers and calculates the complex stress state within the composite.
KeywordsComposite Shape Memory Alloy Characterization Modeling
Unable to display preview. Download preview PDF.
- K. Graff, Ultrasonic Additive Manufacturing, American Society for Metals International, 2011.Google Scholar
- K. Graff, M. Short, M. Norfolk, Very High Power Ultrasonic Additive Manufacturing (VHP UAM), in: International Solid Freeform Fabrication Symposium, Austin, TX, 2011.Google Scholar
- R. Hahnlen, Characterization and Modeling of Active Metal-Matrix Composites with Embedded Shape Memory Alloys, Ph.D. thesis, The Ohio State University, Columbus, OH (2012).Google Scholar
- A. Hehr, M. Dapino, Interfacial Shear Strength Estimates of NiTi — Al Matrix Composites Fabricated via Ultrasonic Additive Manufacturing, Composites Part B: Engineering In Review.Google Scholar
- R. Hahnlen, M. J. Dapino, Stress-Induced Tuning of Ultrasonic Additive Manufacturing, in: Proceedings of SPIE Vol 8342, San Diego, CA, 2012.Google Scholar
- D. Lagoudas (Ed.), Shape Memory Alloys: Modeling and Engineering Applications, Springer, 2008.Google Scholar
- P. Wolcott, A. Hehr, M. Dapino, Optimized Welding Parameters of Al 6061 Ultrasonic Additive Manufactured Structures, JMR 29 (18).Google Scholar
- Vishay, Measurement of Thermal Expansion Coefficient Using Strain Gages, Tech. rep., Micro-Measurements, tN-513–1 (2010).Google Scholar
- ABAQUS 6.11 Documentation, Dassault Systèmes Simulia Corporation, 2011.Google Scholar