Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Deformation or change in stress after fracture – cutting – or...
Patent
1978-05-16
1979-05-22
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Deformation or change in stress after fracture, cutting, or...
G01N 104
Patent
active
041552644
ABSTRACT:
Method for determining internal stresses in structural members in machine or apparatus manufacturing by machining, around a measuring location provided with strain gages, a circular slot into the surface of the structural member that is to be measured, measuring changes in strain of the core of the measuring location left standing, and calculating the internal stresses from the measured strains and a depth-dependent decay function determined on a calibrating material sample, the improvement therein affording the determination of internal stresses in the structural members at depths greater than about 5 mm, includes the steps of mechanically removing the measuring-location core down to a new surface at the base of the circular slot, securing a strain gage to a new measuring location at the new surface, machining another circular slot around the new measuring location, measuring changes in strain of the core of the new measuring location left standing while measuring changes in strain thereof and repeating the foregoing steps for respective slot depths until a given depth at which internal stresses in the structural members are to be determined is reached, a separate depth-dependent decay function being determined on a calibrating material sample for each new measuring location core.
REFERENCES:
patent: 3765230 (1973-10-01), Bohm et al.
patent: 3803905 (1974-04-01), Wolf et al.
patent: 3943758 (1976-03-01), Wolf et al.
Bender Norbert
Hofer Gerhard
Lenz Olaf
Stucker Erwin
Kraftwerk Union Aktiengesellschaft
Lerner Herbert L.
Myracle Jerry W.
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