Patent ID: 6568250
Filing Date: 2003-05-27
Classification: G01N

Abstract:
A method for determining residual stress in a sample under test, the method comprising the steps of:(1) before the sample under test is processed, placing a specified load on an unprocessed sample under test that forces the unprocessed sample under test against an indenter, and determining the penetration of the indenter into the unprocessed sample under test; (2) processing the sample under test; (3) after the sample under test is processed, placing the specified load on the processed sample under test that forces the processed sample under test against the indenter, and determining the penetration of the indenter into the processed sample under test; and (4) determining the residual stress in the processed sample under test from the penetration of the indenter into the unprocessed sample under test and from the penetration of the indenter into the processed sample under test from the following formula: h2/h02=(1âˆ’(residual stress)/pav)âˆ’1, whereh=penetration of the indenter into the sample under test after the sample under test is processed, h0=penetration of the indenter into the sample under test before the sample under test is processed, and pav=the specified load on the indenter.