Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1985-10-08
1987-10-20
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
7386221, 29407, 285 93, G01L 524
Patent
active
047005769
ABSTRACT:
A process is provided for executing the screwing of a threaded joint for steel tubes, designed especially for the petroleum industry, of the type having a male element (1) with external threading (3) and female element (2) with internal threading (4), as well as at least one pair of screwing limit stops (5, 6). A strain gauge which allows the instantaneous determination of longitudinal deformations of the external surface along a line of the female element (2) is applied to the external surface of the female element (2) at a certain distance from the plane of the screwing limit stop and on the side of said plane which is opposite to the threads (3, 4), and the screwing down of the joint is executed until the indications provided by the strain gauge corresponds to an extension of a predetermined value of the surface of the female element (2) along said line at the level of the gauge.
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N. I. Prigorovsky, "Contraintes et deformations dans les pieces et ensembles de machines", Moscou, 1961, p. 384.
N. R. Gontcharov "Determination de contraintes dans les elements de machines au moyen de jauges de deformation et de vernis", Moscou, Machguiz, 1946, pp. 27-28.
M. Raulins, "How Loading Affects Tubular Thread Shoulder Seals", 56 Petroleum Engineer International, p. 43 (1984).
Grare Didier
Salkin Herve
Ruehl Charles A.
Vallourec
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