The effect of interlayer properties on residual stresses in ceramic-metal joining
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
Finite element modeling (FEM) was used to investigate the role of interlayers on residual stresses in ceramic-metal joining. Simple axisymmetric Al{sub 2}O{sub 3}-Ni specimens were examined using elastic-plastic temperature dependent properties. Residual stresses and strains were calculated for various assumed interlayer types, and the stresses responsible for causing joint failures were compared to those for the direct bonding (no interlayer) case. In some cases, composite and graded interlayers can result in local stresses higher than for direct bonding, where plasticity plays a significant role in limiting peak stresses. Significant reductions in the critical stresses were only predicted for low yield strength, ductile interlayers, or for interlayers having non-linear composition profiles exhibiting gradual changes in properties adjacent to the ceramic. Modeling results provide useful guidelines for selecting appropriate joining techniques and joint interlayer materials. Because interlayers also effect bonding strengths, as well as the locations of critical stresses, benefits can be realized irrespective of changes in the magnitude of the peak residual stress.
- DOE Contract Number:
- AC07-94ID13223
- OSTI ID:
- 539140
- Report Number(s):
- CONF-9604124--
- Country of Publication:
- United States
- Language:
- English
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