Grant: Idea to Innovation

The technology to be advanced is the multi-memory material (MMM) processing technology which is broadly applicable to shape memory alloys (SMA) or smart materials. Traditional SMAs are batch processed and the monolithic component consists of a single set of transformation temperatures. Thus, the material is capable of only 'remembering' a single shape. In the University of Waterloo developed MMM technique, with the application of a local heat source, the local composition and microstructure can be modified, which in turn alters the local transformation temperature. Consequently this processed area will exhibit an additional memory, where the remaining unaffected material will still exhibit its original properties. In the proposed project the MMM technology will be implemented to enhance the performance of an electronically controlled vibration clutch assembly in an automotive belt tensioning application. The functionality of traditional SMA actuated vibration clutch assemblies will be enhanced by adding multiple memories (temperature responses) to the SMA actuator, increasing performance and improving fuel efficiency. However, the MMM technology is not limited to automotive applications, it also has a large potential for use in medical, aerospace, micro electro-mechanical systems (MEMS), and microelectronics industries that currently utilize single memory SMAs. This automotive belt tensioner application is a rapid method of implementing this technology and will act as a platform to advance it into other applications and industries. The objectives of this project are to 1) demonstrate the MMM technology enhances the functionality of SMAs, 2) refine processing parameters to better tailor thermal properties, 3) develop a database of process parameters and their relations to performance data, 4) design and fabricate a SMA belt tensioner having enhanced thermal modulation, and 5) advance potential industry partnerships.