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ASTM E1561-20

Current Revision

Standard Practice for Analysis of Strain Gage Rosette Data

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1.1 The two primary uses of three-element strain gage rosettes are (a) to determine the directions and magnitudes of the principal surface strains and (b) to determine residual stresses. Residual stresses are treated in a separate ASTM standard, Test Method E837. This practice defines a reference axis for each of the two principal types of rosette configurations used and presents equations for data analysis. 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 here is perhaps the most common.

1.2 The equations in 4.2 and 4.3 of this practice are derived from infinitesimal (linear) strain theory. They are very 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.


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.


SDO ASTM: ASTM International
Document Number E1561
Publication Date Sept. 1, 2020
Language en - English
Page Count 5
Revision Level 20
Supercedes
Committee E28.01
Publish Date Document Id Type View
Sept. 1, 2020 E1561-20 Revision
April 15, 2014 E1561-93R14 Reaffirmation
Sept. 1, 2009 E1561-93R09 Reaffirmation
June 10, 2003 E1561-93R03 Reaffirmation
April 10, 1998 E1561-93R98 Reaffirmation