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URN etd-0807107-150440 Statistics This thesis had been viewed 3564 times. Download 2143 times. Author Chien-Hung Chen Author's Email Address No Public. Department Mechanical Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 120 Title The elastic, plastic and thermal mismatch effect on the mechanical properties and stress distribution Keyword and mechanical properties thermal mismatch plastic mismatch elastic mismatch interlayer film film interlayer elastic mismatch plastic mismatch thermal mismatch and mechanical properties Abstract Nanoindentation has been the mostly common used technique to measure the mechanical properties of materials because of the easy and speed. Nanoindentation can measure hardness, elastic modulus, fracture toughness and residual stress. In continuous stiffness measurement (CSM), the properties of grade films can be obtained.
The implementation of interlayer is a common technique to enhance the adhesion
between coating and substrate. However, it is not necessary the case when it comes to
choosing the proper interlayer. It has been shown that the elastic and plastic property
mismatch will influence the overall mechanical properties in a thin film/substrate
system. How the addition of interlayer affects the mechanical properties in a film/interlayer/substrate system is still unknown.
This study will focus on interlayer on soft film/hard substrate and hard film/soft substrate. The role of elastic and plastic property mismatch will be studied. Models about load, hardness and von Mises stress distribution in film/interlayer/substrate system will be proposed and will be verified by finite element calculation. This will elucidate the importance of interlayer in a coating system.
Advisor Committee Che-hung Wei - advisor
Jeng-Haur Hong - co-chair
Yung-yu Chen - co-chair
Files Date of Defense 2007-07-13 Date of Submission 2007-08-07