Experimental measurement of coefficient of thermal expansion for graded layers in Ni-Al2O3 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

書誌事項

タイトル別名

• 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

抄録

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.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 50 (6), 1553-1557, 2009

  公益社団法人 日本金属学会

キーワード

• functionally graded material
• coefficient of thermal expansion
• finite element method
• thermal residual stress

詳細情報

• CRID: 1390282679226985088
• NII論文ID: 10024816585
• NII論文ID: 130004454307
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2009028
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 10237757
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10237757
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/50/6/50_M2009028/_pdf
• 本文言語コード: en
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