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ASTM E1426-98(2003)

Historical Reaffirmation

Standard Test Method for Determining the X-Ray Elastic Constants for Use in the Measurement of Residual Stress Using X-Ray Diffraction Techniques

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1.1 This test method covers a procedure for experimentally determining the effective elastic parameter, Eeff, for the evaluation of residual and applied stresses by X-ray diffraction techniques. The effective elastic parameter relates macroscopic stress to the strain measured in a particular crystallographic direction in polycrystalline samples. Eeff should not be confused with E, the modulus of elasticity. Rather, it is nominally equivalent to E/(1 + ν) for the particular crystallographic direction, where ν is Poisson's ratio. The effective elastic parameter is influenced by elastic anisotropy and preferred orientation of the sample material.

1.2 This test method is applicable to all X-ray diffraction instruments intended for measurements of macroscopic residual stress that use measurements of the positions of the diffraction peaks in the high back-reflection region to determine changes in lattice spacing.

1.3 This test method is applicable to all X-ray diffraction techniques for residual stress measurement, including single, double, and multiple exposure techniques.

1.4 The values stated in inch pound units are to be regarded as the standard. The SI units given in parentheses are for information only.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


This test method provides standard procedures for experimentally determining the effective elastic parameter for X-ray diffraction measurement of residual and applied stresses. It also provides a standard means of reporting the precision of the parameter.

This test method is applicable to any crystalline material which exhibits a linear relationship between stress and strain in the elastic range.

This test method should be used whenever residual stresses are to be evaluated by an X-ray diffraction technique and the effective elastic parameter of the material is unknown.

SDO ASTM: ASTM International
Document Number E1426
Publication Date April 10, 2003
Language en - English
Page Count 4
Revision Level 98(2003)
Supercedes
Committee E28.13
Publish Date Document Id Type View
Oct. 1, 2019 E1426-14R19E01 Revision
Dec. 1, 2014 E1426-14 Revision
Oct. 10, 1998 E1426-98 Revision
Sept. 1, 2024 E1426-14R24 Reaffirmation
June 1, 2009 E1426-98R09E01 Reaffirmation
April 10, 2003 E1426-98R03 Reaffirmation