Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/231470
Title: Microstructures and magnetic phase transformations in shape memory alloy polyurethane polymer composites for acoustic applications
Researcher: Mahalakshmi C
Guide(s): Mahendran M
University: Manonmaniam Sundaranar University
Completed Date: 2018
Abstract: This thesis deals with the research work carried out on Smart Materials, newlineone of the multifunctional materials used as sensors and actuators. newlineFerromagnetic Shape Memory Alloy (FSMA) is one of the classes of Smart newlineMaterials in which the characteristics, large power stroke output and frequency newlineresponse can be enhanced by applying magnetic field which leads to the newlineMagnetic Field-Induced Strain (MFIS). These properties possessed by the newlineFSMA demanded that these alloys can be used as actuators and sensors. This newlinethesis primarily consists of seven chapters which discuss the salient features newlineand the new technological developments of the FSMA.The basic properties of newlinethe Ni-Mn-Ga alloys have been analysed using the traditional characterization newlinetechniques. The effect of Mn substitution on both the martensite and the newlinemagnetic transition of the stoichiometeric FSMA Ni-Mn-Ga alloys has been newlinestudied. The studies confirm that the Mn substitution induces the crystal newlinestructure from highly ordered austenite cubic structure to martensite newlineorthorhombic, the martensite transformation temperature increases and the newlineCurie transition temperature decreases with the increase of Mn content in place newlineof Ga. newlineA custom-made experiment has been designed to determine the newlinemagneto-thermo-mechanical properties of Ni-Mn-Ga/PU polymer composites. newlineThe sample Ni-Mn-Ga/PU, used was fixed between a commercial piezo stack newlineactuator and two PZT stress sensors. The longitudinal stress waves passed newlinethrough the test samples are received by the PZT sensor. The test samples used newlinein the investigations are pure PU, Ni-Mn-Ga/PU, Ni-Mn-Ga single crystals and newlineTerfenol-D. The piezo actuation generates the tensile and compressive waves newlinein the samples. newline
Pagination: xviii, 134p.
URI: http://hdl.handle.net/10603/231470
Appears in Departments:Department of Physics

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02_certificate.pdf33.38 kBAdobe PDFView/Open
03_acknowledgement.pdf34.22 kBAdobe PDFView/Open
04_list of content.pdf43.49 kBAdobe PDFView/Open
05_list of tables&figures.pdf59.19 kBAdobe PDFView/Open
06_list of abbreviations.pdf28.05 kBAdobe PDFView/Open
08_chapter1.pdf1.81 MBAdobe PDFView/Open
09_chapter2.pdf524.87 kBAdobe PDFView/Open
10_chapter3.pdf1.37 MBAdobe PDFView/Open
11_chapter4.pdf1.65 MBAdobe PDFView/Open
12_chapter5.pdf1.74 MBAdobe PDFView/Open
13_chapter6.pdf244.5 kBAdobe PDFView/Open
14_chapter7.pdf57.81 kBAdobe PDFView/Open
15_reference.pdf124.28 kBAdobe PDFView/Open
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