Analysis of end stresses in glass-metal bimaterial strips
We have analyzed the shear and normal residual stresses which build up along the interface near the end of a glass-metal seal during cooling. These stresses strongly affect the measured strength of a seal. Previous treatments of this problem have identified the presence of large interfacial transverse normal and shear stresses at the ends of bimaterial joints. We show the presence of maxima and minima in both force and moment. We demonstrate that, for certain material property combinations and relative thicknesses, the interfacial moment can induce either a peel or a pinch condition at the ends of this strip. We tested this with strips of high expansion glass-ceramic sealed to 304 stainless steel and obtained qualitative agreement. Careful finite element modeling of the strips showed that peel and pinch conditions do not necessarily coincide with the sign of the singular transverse normal stress at the strip end. This sign appears to be controlled by differences in thermoelastic properties and not by relative thickness. 13 refs., 15 figs., 3 tabs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5977684
- Report Number(s):
- SAND-87-0432C; CONF-871207-1; ON: DE87007848
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ALLOYS
BONDING
CERAMICS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELASTICITY
ELEMENTS
EQUATIONS
FABRICATION
FINITE ELEMENT METHOD
GLASS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
LITHIUM COMPOUNDS
LITHIUM SILICATES
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
RESIDUAL STRESSES
SEALS
SHEAR
SILICATES
SILICON COMPOUNDS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRESSES
SURFACES
TENSILE PROPERTIES
THERMAL STRESSES
THERMOELASTICITY