Material characterization at high strain by adapted tensile tests

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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.
Original languageEnglish
Pages (from-to)1195-1209
Number of pages15
JournalExperimental mechanics
Volume52
Issue number8
DOIs
Publication statusPublished - 2012

Keywords

  • IR-81451
  • METIS-282103
  • Onderzoek van algemene industriele aardMechanical engineering and technology

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