Experimental Measurement of Coefficient of Thermal Expansion for Graded Layers in Ni-Al<SUB>2</SUB>O<SUB>3</SUB> FGM Joints for Accurate Residual Stress Analysis
-
- Ryu Sae-hee
- Division of Material and Chemical Engineering, Hanyang University
-
- Park Jong-ha
- Division of Material and Chemical Engineering, Hanyang University
-
- Lee Caroline Sunyong
- Division of Material and Chemical Engineering, Hanyang University
-
- Lee Jae-chul
- School of Mechanical and Aerospace Engineering, Seoul National University
-
- Ahn Sung-hoon
- School of Mechanical and Aerospace Engineering, Seoul National University Institute of Advanced Machinery and Design, Seoul National University
-
- Oh Sung-tag
- Department of Materials Science and Engineering, Seoul National University of Technology
Bibliographic Information
- Other Title
-
- Experimental measurement of coefficient of thermal expansion for graded layers in Ni-Al2O3 FGM joints for accurate residual stress analysis
Search this article
Abstract
Functionally graded materials have composition gradients from one end to the other as the result of a gradual transition of the properties of different materials. The residual stress caused by the difference of coefficient of thermal expansion can be minimized using functionally graded material. Therefore, the gradient of the coefficient of thermal expansion should vary according to the compositional gradient. In this study, the coefficient of thermal expansion of each compositional layer of Ni-Al2O3 functionally graded material was measured using a dilatometer. These measurements provided the material properties required to calculate the residual stress, using three-dimensional modeling for accurately predicting crack positions, since it is difficult to measure residual stress experimentally. The measurement results showed the gradual increase of the coefficient of thermal expansion from Al2O3-rich composition to Ni-rich composition. Finally, the results of calculating residual stresses using the measured coefficient of thermal expansion showed that the crack positions were predicted more accurately than those using the coefficient of thermal expansion calculated by the linear rule of mixtures. This was because the measured values include the effect of porosity of the composite, whereas the linear rule of mixtures cannot account for the porosity of each layer.
Journal
-
- MATERIALS TRANSACTIONS
-
MATERIALS TRANSACTIONS 50 (6), 1553-1557, 2009
The Japan Institute of Metals and Materials
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390282679226985088
-
- NII Article ID
- 10024816585
- 130004454307
-
- NII Book ID
- AA1151294X
-
- ISSN
- 13475320
- 13459678
-
- NDL BIB ID
- 10237757
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed