报告题目： Temperature memory effect/triple-shape memory effect in shape memory materials and shape memory effect in keratin
Abstract: Besides the shape memory effect (SME), in which the permanent shape can be recovered at the presence of the right stimulus, the temperature memory effect (TME) is another feature of shape memory materials. The TME refers to a phenomenon that a particular temperature can be memorized in a certain manner. A systematical investigation of the mechanism from energy point of view for the TME in NiTi shape memory alloys (SMAs) is presented based on the results of a series of differential scanning calorimeter (DSC) tests. The traditional approach for the TME is expanded, and a modified one is identified, which can be utilized to monitor over-heating temperature with high accuracy. The application of this method will be also discussed.
The triple-shape memory effect (triple-SME), which is easily achievable in shape memory polymers (SMPs) but not in SMAs, is achieved in a few types of NiTi SMAs. Two approaches, namely small strain program and larger strain program are proposed. The conditions on both material and programming parameters, as well as the mechanisms for the triple-SME, are identified and the influence of programming parameters is investigated.
Both heating-induced and water-induced SMEs in human nail and silkworm silk, in which keratin is their main component, are systematically investigated. The influence of water content is studied. The triple-SME utilizing multiple-stimuli is realized in nail. The fundamentals behind the difference in heating and water based SMEs are studied.
Dr Wei Min Huang obtained his PhD from Cambridge University, UK and then joined the School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore. His research interest is on various shape memory materials and technologies. He has published over 100 journal papers and two books, one about thin film shape memory alloys and the other about polyurethane shape memory polymers.