Measuring method for determining the elongation after rupture of

Details Measuring method for determining the elongation after rupture of Measuring method for determining the elongation after rupture of

1991-09-10

1993-03-16

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

G01N 308

Patent

active

051933985

ABSTRACT:
The invention relates to a measuring method to determine elongation after fracture on a tensile testpiece in a computer controlled tensile test. To meet the requirements of the tensile test to DIN EN 10002/1, the measuring grid known from DIN EN 10002/1 is applied to the tensile testpiece. The measuring grid is scanned with a line sensing camera. In the tensile test the elongation of the testpiece is determined when the tensile force has exceeded its maximum and drops to zero. That place for which the computer with the CCD camera detects the greatest distance between adjacent grid lines is utilized to calculate the elongation after fracture to DIN EN 10002/1.

REFERENCES:
patent: 4031746 (1977-06-01), Furuta et al.
patent: 4821579 (1989-04-01), Gernhart et al.
patent: 4895029 (1990-01-01), Yamada et al.
German Industrial Standard (DIN) No. EN 10 002, Jun. 1987.
"Probleme des rechnergesteuerten Zugversuchs", Gunter Robbiler, Materialprufung 31 (1989), pp. 371-376.

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