Overstress indication

Details Overstress indication Overstress indication

2006-08-08

2006-08-08

Noori, Max (Department: 2855)

Measuring and testing

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

Indicating coating or sheet providing direct visual indication

Reexamination Certificate

active

07086291

ABSTRACT:
Devices and their subassemblies typically undergo stresses during manufacturing and testing processes and during general use. To provide visual indication of stress or strain levels endured, a preferred embodiment includes frangible material deposited on particular isolated areas of devices and/or their subassemblies. The frangible material, when applied according to one methodical embodiment, provides visible indication of overstrain as cracks in the frangible material deposits, and of non overstrain when cracks are not visible.

REFERENCES:
patent: 4318936 (1982-03-01), Moss et al.
patent: 5702847 (1997-12-01), Tarumoto et al.
patent: 6309975 (2001-10-01), Wu et al.
patent: 6675476 (2004-01-01), Hostetler
“Principles of Stresscoat® Brittle Coating Experimental stress analysis,”StressCoat,pp. 1-12.

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