Method for testing stress-relaxation properties of sealing...

Details Method for testing stress-relaxation properties of sealing... Method for testing stress-relaxation properties of sealing...

2005-10-18

2005-10-18

Noori, Max (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Threaded fastener stress

C073S040000

Reexamination Certificate

active

06955092

ABSTRACT:
A test method for determining, quantifying, and qualifying the stress-relaxation characteristics of a sealant material compound comprising applying a sealant material layer between a first plate and a second plate, disposing a fastener assembly through the plates, and providing tension preload upon the fastener assembly so as to compress the plates together. The elongation of the fastener assembly is measured and the test assembly is heated and cooled under controlled parameters and the elongation of the fastener assembly is again measured. The stress-relaxation of the sealant material compound is correlated to the corresponding change in fastener assembly elongation for the purposes of measuring, quantifying, and qualifying the sealant material compound.

REFERENCES:
patent: 4062227 (1977-12-01), Heyman
patent: 4294122 (1981-10-01), Couchman
patent: 4554838 (1985-11-01), Paus
patent: 4899591 (1990-02-01), Kibblewhite

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