Method and apparatus for determining preexisting stresses based on indentation or other mechanical probing of the material
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United States of America Patent
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Oct 30, 2001
Issued Date -
N/A
app pub date -
Jul 21, 2000
filing date -
May 26, 1998
priority date (Note) -
Expired
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Abstract
Provided are methods and apparatus for determining from indentation testing the preexisting stress and/or effective strain in a section of a material. The invention also provides methods and apparatus for determining the variation of the stress with depth in the material (e.g. the gradient). According to the invention, first data are provided from an indentation test of the stressed (or strained) section. The stress (or effective strain) can then be determined from the first data and from second data characteristic of the material, such as a stress-strain curve. Second data can also be obtained from an additional indentation test of a section having a known stress. The methods provided herein are suitable for programming on a general purpose computer or calculator.
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