Nano-SMA Fiber Composites Development and Applications
Abstract
We design a set of self-strengthening AMCs with shape memory nanofibers with the aim of inducing compressive stress at different use temperatures; (i) high temperature for leading edge structure panels or those near engine and (ii) low temperatures for composite face sheets of AF cryogenic tanks. To this end, two types of SM nanofibers will be used, shape memory alloy (SMA) and shape memory polymer (SMP). SMA exhibit phase change at transformation temperatures (Ms, Mf, As, Af) while SMP exhibits a similar phase change at Tg. This project is aimed at creating a set of new deigns of autonomic multi-functional composites (AMCs) by interacting with different disciplines - Polymer Chemistry, Materials Science and Engineering, and Mechanical Engineering at the University of Washington (UW) and Hokkaido University (HU). The UW-HU team proposes to design self-strengthening AMCs for use in the composite structures in high and low temperature environments. The key active and sensing material in designing the proposed AMCs is shape memory (SM) nanofibers where SM can be shape memory alloy (SMA) or shape memory polymer (SMP). SMA and SMP nano-fiber will be used for self-strengthening AMCs in high temperature (temperature change), or in low temperature. The key concept in designing self-strengthening AMCs is to induce compressive stress in the matrix material through a shape (or length) change in SM nanofibers upon temperature change. This compressive stress in the matrix is expected to suppress any cracking in the matrix. Use of ferromagnetic SMA FePd nano-fibers is expected to provide additional functionality to the self-strengthening AMC, i.e. (i) self-diagnosis if the composite is inspected by magnecto-optic-image scanner and (ii) stealth under radar detection.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 27, 2007
- Accession Number
- ADA472570
Entities
People
- H. Kato
- H. Tamagawa
Organizations
- Hokkaido University