Finite element analysis of thermal residual stresses at graded ceramic-metal interfaces. Part II. Interface optimization for residual stress reduction

Journal Article · Thu Jul 15 00:00:00 EDT 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.354911· OSTI ID:6344208

Drake, J T; Williamson, R L; Rabin, B H ^[1]

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1. Idaho National Engineering Laboratory, EG G Idaho Inc., P.O. Box 1625, Idaho Falls, Idaho 83415-2218 (United States)

An elastic-plastic finite element method numerical model previously developed (see Part I of this article) for predicting thermal residual stresses at graded ceramic-metal interfaces has been applied to determine interface conditions favorable for achieving residual stress reductions. Using Al[sub 2]O[sub 3]-Ni as a model system, and for a fixed specimen geometry, a study was performed to investigate the effects of different interlayer thicknesses and nonlinear composition profiles on strain and stress distributions established during cooling from an assumed elevated bonding temperature. For each interface condition, relative stress reductions were evaluated by comparing the magnitude of specific stress and strain components important for controlling interface failure with those predicted for a sharp (nongraded) interface. For the geometry considered, stress was reduced by thick graded interlayers and nonlinear composition profiles that distributed the largest property changes over the interlayer region having low elastic modulus and high plasticity. In contrast to the Part I results for a linear composition profile, the optimized interlayer condition effectively reduced the peak near-surface axial stress component.

• DOE Contract Number: AC07-76ID01570
• OSTI ID: 6344208
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 74:2; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCULATION METHODS
CERAMICS
CHALCOGENIDES
ELASTICITY
ELEMENTS
FINITE ELEMENT METHOD
INTERFACES
MECHANICAL PROPERTIES
METALS
NICKEL
NUMERICAL SOLUTION
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
RESIDUAL STRESSES
STRESSES
TENSILE PROPERTIES
THERMAL STRESSES
TRANSITION ELEMENTS