Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1978-03-14
1980-01-08
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
116DIG34, 85DIG1, G01D 2100
Patent
active
041821890
ABSTRACT:
A method for attaining a predetermined compressive stress is achieved by a device in the form of a washer, coating, or plug which as a function of pressure does not yield significantly, but when a predetermined pressure is reached, a sudden change in structure takes place which effects detonation of an explosive mixture which detonation is indicated by a sound, a puff of smoke, a change of appearance, a sudden release of heat, or an instantaneous increase in friction. The device includes a porous brittle body in which an explosive substance has been absorbed, and also preferably hard particles that aid in effecting detonation when the porous body goes through a physical change. The detonation can also join contact surfaces together, serve as an indication of desired prestress or torque applied to a fastener, to indicate a load limit, and the like.
REFERENCES:
patent: 2960902 (1960-11-01), De Caro
patent: 3170365 (1965-02-01), Vaughn
patent: 3435724 (1969-04-01), Trungold
patent: 3889526 (1975-06-01), Elsner et al.
patent: 3964229 (1976-06-01), Fischer
patent: 3974685 (1976-08-01), Walker
Dock Carl G.
Schrewelius Nils G.
Bulten-Kanthal AB
Ciarlante Anthony V.
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