Method and apparatus for determining preexisting stresses based

Details Method and apparatus for determining preexisting stresses based Method and apparatus for determining preexisting stresses based

1998-05-26

2000-12-05

Noori, Max

Measuring and testing

Hardness

By penetrator or indentor

73789, G01N 348

Patent

active

06155104&

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.

REFERENCES:
patent: 3763697 (1973-10-01), Sturm
patent: 3969928 (1976-07-01), Zarka
patent: 4896339 (1990-01-01), Fukumoto
patent: 5146779 (1992-09-01), Sugimoto et al.
patent: 5433215 (1995-07-01), Athanasiou et al.
patent: 5463896 (1995-11-01), Abbate et al.

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