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Reduction of Functionally Graded Material Layers for Si3N4-Al2O3 System Using Three-Dimensional Finite Element Modeling

Title
Reduction of Functionally Graded Material Layers for Si3N4-Al2O3 System Using Three-Dimensional Finite Element Modeling
Author
이선영
Keywords
functionally graded material (FGM); finite element method (FEM); thermal residual stress; linear mixture rule; maximum tensile stress theory; maximum principal stress theory
Issue Date
2008-03
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v. 49, No. 4, Page. 829-834
Abstract
Numerical analysis method was used to reduce the number of functionally graded material (FGM) layers for joining Si3N4-Al2O3 using polytypoid interlayer by estimating the position of crack. In the past, hot press sintering of multi-layered FGMs with 20 layers of thickness 500 mu m each have been fabricated successfully. In this paper, thermal residual stresses were calculated using finite element method (FEM) to find the optimized number of layers and its thicknesses of FGM joint. The number of layers for FGM was reduced to 15 layers from 20 layers. Thicknesses were varied to minimize residual stresses within the layers while reducing the number of FGM layers. The damage caused by thermal residual stress was estimated using maximum principal stress theory and maximum tensile stress theory. The calculated maximum stress was found to be axial stress of 430 MPa around 90% 12H/10% Al2O3 area. For each case, calculated strength of each FGM layer by linear rule of mixture was compared with computed thermal residual stresses. Thermal analysis results correctly predicted the position of crack, and this position agreed well with fabricated joints. Therefore, this numerical analysis method can be applied to reduced FGM layers of crack free joint. Finally, new composition profile of crack free joint was proposed using FGM method.
URI
https://www.jstage.jst.go.jp/article/matertrans/49/4/49_MRA2007319/_article/-char/ja/https://repository.hanyang.ac.kr/handle/20.500.11754/104381
ISSN
1345-9678
DOI
10.2320/matertrans.MRA2007319
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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