BS EN ISO 16808:2014

Foreword
1 Scope
2 Symbols and abbreviated terms
3 Principle
4 Test equipment
5 Optical measurement system
6 Test piece
7 Procedure
8 Evaluation methods for the determination of
   the curvature and strains at the pole
9 Calculation of biaxial stress-strain curves
10 Test report
Annex A (informative) - International comparison of
        symbols used in the determination of the bulge
        test flow curve
Annex B (normative) - Test procedure for a quality
        check of the optical measurement system
Annex C (informative) - Computation of the curvature
        on the basis of a response surface
Annex D (informative) - Determination of the equi-biaxial
        stress point of the yield locus and the hardening
        curve
Bibliography

Defines a method for determination of the biaxial stress-strain curve of metallic sheets having a thickness below 3 mm in pure stretch forming without significant friction influence.

This International Standard specifies a method for determination of the biaxial stress-strain curve of metallic sheets having a thickness below 3mm in pure stretch forming without significant friction influence. In comparison with tensile test results, higher strain values can be achieved.

NOTE In this document, the term \'biaxial stress-strain curve\' is used for simplification. In principle, in the test the \'biaxial true stress-true strain curve\' is determined.