Mechanical testing of metallic glass ribbons.
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Insinööritieteiden korkeakoulu |
Master's thesis
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Authors
Date
2021-01-25
Department
Major/Subject
Mcode
Degree programme
Master's Programme in Mechanical Engineering (MEC)
Language
en
Pages
52+9
Series
Abstract
Metallic glasses are novel engineering materials possessing unique mechanical properties which are high suitable in industrial applications as well as a structural material. Metallic glasses are fascinating because of their different properties and behavior. Often this non periodic properties are superior to the counter part of their identical crystalline alloys. Despite having superior features, understanding the behavior in different loading conditions more research approach. This thesis focuses on comparative study of Nano and micro hardness of metallic glass ribbons and DIC testing adopting different approach to implement pattern on thin specimen surface. The qualitative study as well as determining suitable method to implement pattern is a part of this thesis. Characterization of affecting factors and error sources would help in further investigations in future. Digital Image correlation is a non-contact full field measurement technique which provides highly reliable data in varying laboratory conditions. DIC algorithm found to be robust technique for high precision measurement. However, implementation of working pattern with high contrast on specimen is a challenge. Illumination from surroundings as well as vibration affects the obtained data. Tensile test graph provides the idea about the material behavior. However, sliding effect and gripping mechanism remains a challenge for thin specimen for micro and Nano-indentation tests and tensile tests. Implementing improved surface polishing and machining mechanism would aid to ensure more reliable outcome from tests.Description
Supervisor
Bossuyt, SvenThesis advisor
Bossuyt, SvenKeywords
digital Image correlation, DIC, nano-indentation, micro indentation