Active stress specimen using an electromagnet and belleville was

Details Active stress specimen using an electromagnet and belleville was Active stress specimen using an electromagnet and belleville was

1993-11-17

1995-05-23

Williams, Hezron E.

Measuring and testing

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

By loading of specimen

73810, 73808, G01N 1900

Patent

active

054171164

ABSTRACT:
An apparatus and method for inducing and measuring crack growth in a solid by using a double cantilever beam assembly which includes a fracture specimen with a notch that defines a pair of spaced outwardly extending beams terminating at an end where growth of a crack occurs, and a spring assembly for continuously urging the spaced beams apart with a substantially constant pressure that creates a spreading pressure at the end where crack growth occurs to stress the fracture specimen at the end. An electromagnet assembly is used to cyclically apply and remove the spreading pressure caused by the spring assembly.

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