2004 Fiscal Year Final Research Report Summary
Evaluation of Fracture Mechanics in Ceramics Splay-Coated Materials by Using Fast 3-D Digital Image Correlation Method
| Project/Area Number |
15560073
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Osaka Institute of Technology |
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Principal Investigator |
NISHIKAWA Masao Osaka Institute of Technology, Professor, 工学部, 教授 (90189267)
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| Co-Investigator(Kenkyū-buntansha) |
WAKI Hiroyuki Osaka Electro-Communication University, Lecturer, 工学部, 講師 (30324825)
NAKAMACHI Eiji Osakia Institute of Technology, Professor, 工学部, 教授 (60099893)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Digital Image Correlation / Small Displacement / Delamination / Crack Growth / Delamination Cracking / Thin Material / Surface strain / Stress-Strain Response |
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| Research Abstract |
Low pressure plasma spraying (LPPS) is used to prepare CoNiCrAlY alloy coatings for insulation from the high temperature corrosion and oxidation. However, mechanical properties of LPPS CoNiCrAlY coatings, which have important effects on the life of a gas turbine blade, have not been clarified. In this study, monotonic and cyclic deformation behaviors of the CoNiCrAlY coatings under uniaxial compressive loading were examined. Coating specimens independent of substrates were fabricated by dissolving out the substrates only at the region of gauge area by nitric acid. The thickness of the coatings were 300μm. The stress-strain response was measured using the laser speckle strain / displacement gauge (SSDG). The coating showed the nonlinear stress-strain response with a considerably low elastic modules. It was found that the coating left permanent strain by compressive loading: the coating was hardened by compressive loading. The generated strain was also found to decrease furthermore by undergoing cyclic compressive load. The coatings with high porosity showed that the large strain, large permanent strain and low Young's modulus.
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