Constant point of load application fracture specimen loading mac

Details Constant point of load application fracture specimen loading mac Constant point of load application fracture specimen loading mac

1978-11-09

1980-04-22

Woodiel, Donald O.

Measuring and testing

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

By loading of specimen

73856, G01M 500

Patent

active

041988701

ABSTRACT:
A constant point of load application fracture specimen loading machine for applying a load between grips that engage opposite grip groove faces of a slotted specimen that preferably has as a remainder portion in that slot a "V" shaped slot root whereby, when the machine grips are moved apart, they rotate so as to apply a constant point of load application to pull the specimen apart at that slot root. The machine of the present invention is useful for measuring the fracture toughness, fatigue-crack growth resistance, or stress corrosion crack growth resistance of slotted specimens providing a unique force application system whereby sliding friction losses are minimized, and other introduced effects, such as from specimen grip machining tolerances, or the like, are largely automatically compensated for.

REFERENCES:
patent: 4075884 (1978-02-01), Barker
patent: 4075886 (1978-02-01), Barker
patent: 4116049 (1978-09-01), Barker

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