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ASTM E1561-26

Standard Practice for Analysis of Strain Gage Rosette Data
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ASTM E1561-26

Standard Practice for Analysis of Strain Gage Rosette Data

PUBLISH DATE 2026
PAGES 4
ASTM E1561-26

This practice defines a reference axis for each of the two principal types of rosette configurations and the equations used for three-element strain gage rosette data analysis.

The primary uses of this analysis procedure are to determine the directions and magnitudes of the principal surface strains, and to determine residual stresses.

This is important for consistency in reporting results and for avoiding ambiguity in data analysis, especially when computers are used.

There are several possible sets of equations, but the set presented herein is perhaps the most common.

1.1 The primary use of three-element strain gage rosettes is to determine the directions and magnitudes of the principal surface strains and stresses. This practice defines a reference axis for each of the two principal types of rosette configurations used and presents equations for data analysis.

This definition is important for consistency in reporting results and for avoiding ambiguity in data analysis—especially when computers are used. There are several possible sets of equations, but the set presented here is perhaps the most common.

1.2 The equations presented in Section 4 of this practice are derived from infinitesimal (linear) strain theory. They are accurate for the low strain levels normally encountered in the stress analysis of typical metal test objects.

They become detectably inaccurate for strain levels greater than about 1 %. Rosette data reduction for larger strains is beyond the scope of this practice.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

SDO ASTM: ASTM International
Document Number E1561
Publication Date May 1, 2026
Language en - English
Page Count 4
Revision Level 26
Supercedes
Committee E28.01
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