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Stress-tester

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Stress tester

Details

Inventors: Abbate, Agostino; Frankel, Julius; Scholz, Wilfried; Colangelo, Vito J.; Korman, William J.;
Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC)
Primary Examiner: Noland; Thomas P.
Assistant Examiner:
Attorney, Agent or Firm: Lane; Anthony T., Goldberg; Edward, Sachs; Michael C.

A device is presented for measuring residual stresses in a solid component. he device includes a hardness measuring component which has an indenter for determining hardness at various locations. Stress (.sigma.) data is obtained by converting the hardness measurements according to the formula a.multidot.[.sqroot.4P.sub.o.sup.2 -3P.sup.2 -P], where a is a constant in Kbar.sup.-1 mm.sup.2 /kg, which depends on the type of material under test and also on the type of indentor used, where the pressure p is measured in kg/mm.sup.2, and where the average pressure p.sub.o is the average value of mean pressure p along a radial cut line of the solid component specimen.

DETAILED DESCRIPTION According to the present invention, a stress tester is provided.
This tester comprises a hardness measurer, which has an indenter, and includes a computer, which has software that is designed according to selective formulae for converting hardness data to stress data, and includes a display unit, which prints out the results and which saves the results in its memory.
By using the stress tester, which has a hardness measurer and a computer and a display unit, the abovementioned problems of the prior art x-ray machine and the prior art ultrasonic transducer and the prior art indentation device are avoided.
One object of the present invention is to avoid the problems of the prior art test devices, such as the limitation on sample size of the x-ray machine, and the limitation on sample surface size and smoothness of the ultrasonic transducer.
The foregoing and other objects, features and advantages will be apparent from the following description of the preferred embodiment of the invention as illustrated in the accompanying drawings.

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