Stress tester

US5463896A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• Agostino Abbate · Clifton Park, US
• Julius Frankel · Rensselaer, US
• Wilfried Scholz · Latham, US
• Vito J. Colangelo · Troy, US
• William Korman · Richmond, US

Key dates

• Filing date: Sep 29, 1993
• Grant date: Nov 7, 1995
• Expiry date: Sep 29, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N3/42
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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 EQU a.multidot.[.sqroot.4P.sub.o.sup.2 -3P.sup.2 -P], PA1 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.