Active disassembly of obsolete handphones using shape memory materials

• Main Author: Xu, Wei Wei.
• Other Authors: Huang Weimin
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Manufacturing::Product design
• Online Access: http://hdl.handle.net/10356/45938
• Institution: Nanyang Technological University

This research describes a general introduction to Active Disassembly using Smart Material (ADSM) such as shape memory material (alloy or polymer), the advantages and possible use in achieving active disassembly. The essence of shape memory effect and how will it be implemented to Polymethylmethacrylate (PMMA) thermoplastic polymer are explained. By obtaining the training temperature after Differential Scanning Calorimeter (DSC) test, the compression experimental data are demonstrated and analyzed to understand the optimum shape recovery rate, as well as the characterization of PMMA under different heating and loading conditions. Moreover, the cyclic loading and unloading stress-strain relationships that obtain from the experiment determine the shape fixity, Young’s modulus and compressive stress behaviour. A number of active fastener designs by using PMMA board are accomplished for the demonstration of shape memory effect. Next, an active PMMA screw is fabricated to verify the shape memory behaviour by designing of aluminum training rig, followed by fabricating a snap-fit model. Through the varied methods to achieve active disassembly, a separable PMMA box assembly design is carried out to consolidate the concept of Active Disassembly upon different recovery temperatures.