Material characterization at high strain by adapted tensile tests


Emmens, W.C. and Boogaard, A.H. van den (2012) Material characterization at high strain by adapted tensile tests. Experimental mechanics, 52 (8). 1195 - 1209. ISSN 0014-4851

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Abstract:The strength of materials at high strain levels has
been determined using the so-called Continuous-Bendingunder-
Tension (CBT) test. This is a modified tensile test
where the specimen is subjected to repetitive bending at the
same time. This test enables to create high levels of uniform
strain. A wide variety of materials has been tested this way.
The strength of the material after CBT testing has been
measured in different ways: by secondary tensile tests, by
interrupted CBT tests, and directly from the fracture in the
CBT test. All methods yield similar results: the strength is
largely unaffected by the cyclic pre-deformation and mainly
depends on the overall increase in length. Only for multiphase
materials the strength shows a minor influence of
CBT test conditions. The hardening follows the extrapolated
hardening observed in a conventional tensile test, except for
brass. This test method can potentially be used for measuring
hardening curves at high strain levels.
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Copyright:© 2012 The Author(s)
Engineering Technology (CTW)
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