Characterization of residual stresses in graded ceramic-metal structures: A comparison of diffraction experiments and FEM calculations
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
- Oak Ridge National Lab., TN (United States)
Numerical models have been extensively developed for predicting the thermomechanical behavior of ceramic-metal joints containing graded interlayers. The goal of such modeling is to be able to design optimum interlayer microstructural characteristics required to meet the needs of specific application conditions, and to use this design information to guide component fabrication. The graded specimen examined in this research was fabricated by powder processing methods. Al{sub 2}O{sub 3}-Ni was selected as a model system. The residual stresses expected in the specimen were predicted by FEM calculations using an elastic-plastic model. Strain and stress distributions in the specimen were characterized experimentally using x-ray and neutron diffraction techniques. Preliminary neutron and x-ray diffraction measurements were not in very good agreement with FEM model predictions, particularly regarding the in-plane stresses along the axis of symmetry. These results suggest additional diffraction measurements on graded specimens having fewer interlayers should be carried out, and experimental verification of the constitutive assumptions used in the FEM model is needed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 81043
- Report Number(s):
- CONF-9410244-2; ON: DE95013225; TRN: AHC29520%%110
- Resource Relation:
- Conference: 3. international symposium on structural and functional gradient materials, Lausanne (Switzerland), 10-12 Oct 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Finite element analysis of thermal residual stresses at graded ceramic-metal interfaces. Part II. Interface optimization for residual stress reduction
The effect of interlayer properties on residual stresses in ceramic-metal joining