Abstract
An easy-release screw, which comprises a shape-memory alloy washer and a screw, to facilitate the recycling of resources has developed. We also experimentally examined the characteristics of the shape-memory washer. The screws are assembled by the same method as for conventional screws; once they are disposed of, the fastening washer is released simply by heating the screw to a predetermined temperature to enlarge the inside diameter of the washer, enabling easy disassembly of the screw. It was determined that the release temperature of the shape-memory alloy washer predominantly depends on the transformation point of the wire itself, as well as on the shape-memory alloy processing temperature and the amount of bending strain. By controlling these factors, it is possible to fabricate washers with the fastening release temperature in a specified range, and which can be easily disassembled.
