For testing machines, improvements in determining rupture point

Details For testing machines, improvements in determining rupture point For testing machines, improvements in determining rupture point

1984-05-23

1986-11-25

Levy, Stewart J.

Measuring and testing

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

By loading of specimen

73826, G01N 308

Patent

active

046241442

ABSTRACT:
A tensile testing machine has a pair of cross heads relatively movable along an axis, each cross head having a mechanism for fixedly holding one end of an electrically conductive specimen and in at least one of said mechanisms, electrical insulating means electrically isolating the end of the specimen from the mechanism to provide for the specimen to be part of an electrical circuit for determining the time of specimen rupture. The testing machine also has an extensometer including a pair of strain followers with improved means for setting the gauge length of the strain followers which comprises a pair of gauge followers respectively connected to the strain followers and each gauge follower having an exterior concave groove, a pair of gauge cams, and means supporting the gauge cams a fixed distance apart and for a reciprocating motion toward and away from the gauge followers to respectively engage with and to disengage from the exterior concave grooves, the engagements being for use in establishing the gauge length of the strain followers.

REFERENCES:
patent: 615071 (1898-11-01), Ledward
patent: 1499989 (1924-07-01), Lehmann
patent: 2611966 (1952-09-01), Rebman
patent: 2814883 (1957-12-01), Strimel
patent: 2845828 (1958-08-01), Thomeczek
patent: 3287964 (1966-11-01), Dennis
patent: 3600939 (1971-08-01), Steele
patent: 3721119 (1973-03-01), Strimel
patent: 3835699 (1974-09-01), Strimel
Strimel, "Automated Horizontal Tensile Testing Machines for Rapid Quality Control Testing", Journal of Metals, Jul. 1980.

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