https://scholars.lib.ntu.edu.tw/handle/123456789/598745
標題: | In-situ strain measurement of shape memory alloy fiber during the austenitic and martensitic phase transformation | 作者: | Ma C.-C Chang C.-Y Chang C.-Y. CHIEN-CHING MA |
關鍵字: | digital image correlation;multi-physics effects;phase transformation temperature;shape memory alloy;temperature-strain relation;thermal-mechanical reactions;Austenite;Austenitic transformations;Crystal structure;Deformation;Martensite;Martensitic transformations;Strain measurement;Temperature;Thermal fatigue;Change of temperatures;Digital image correlations;Martensitic phase transformations;Mechanical contraction;Microscale deformation;Phase transformation temperature;Response temperatures;Shape memory alloy fibers;Shape-memory alloy | 公開日期: | 2021 | 卷: | 30 | 期: | 9 | 來源出版物: | Smart Materials and Structures | 摘要: | Fibers made from shape memory alloys perform strain recovery during phase transformation of crystal structure. Controlled parameters such as heating time, holding temperature, and cooling time dominate the micro deformation of shape memory alloy fiber (SMAF). Mechanical contraction occurs at high temperature (austenitic phase), and strain-relief happens at low temperature (martensitic phase). But the rapid change of temperature causes unfinished or incomplete phase transformation, which induces residual strain within the SMAF. The accumulated defects shorten the specimen's life during cyclic loading and lower the limit of fatigue failure. This study uses digital image correlation to provide the in-situ response temperature-strain relations during the phase transformation and quantizes the residual strain within the SMAF. Experiments accurately control the holding temperature of SMAF in three conditions, which are (a) under, (b) around, and (c) beyond the phase transformation temperature of the specimen, and systematically analyzes the self-accommodation and strain-recovery of SMAF in the three experiments. The in-situ measurement of microscale deformation can help the end-user optimize the control parameters and increase the life and performance of SMAF. ? 2021 IOP Publishing Ltd. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112491283&doi=10.1088%2f1361-665X%2fac1561&partnerID=40&md5=0463aeacec581e48f5275f10ca611332 https://scholars.lib.ntu.edu.tw/handle/123456789/598745 |
ISSN: | 09641726 | DOI: | 10.1088/1361-665X/ac1561 |
顯示於: | 機械工程學系 |
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