Contact effects in bending affecting stress and formability

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If a strip is pulled over a curved tool there is a contact stress acting on the strip. This contact stress changes the stress state in the material, which is analysed with a simple model. One effect is that the yield stress in tension is reduced. Predictions by the model agree with observation from a 90-degree bending test found in literature, and indirectly with observation from a stretch-bend test also found in literature. Another effect is that a change in stress state also affects the formability. This is analyzed by applying the maximum force condition on this situation. The predictions agree with a more thorough analysis of the effect of thickness stress in general, but the predictions of both methods are lower than actually observed in tests. There may be other mechanisms at work, and one candidate is presented.
Original languageEnglish
Pages (from-to)1159-1162
Number of pages4
JournalInternational journal of material forming
Issue number1
Publication statusPublished - 7 Apr 2010
EventESAFORM 2010: 13th International ESAFORM Conference on Material Forming - Brescia, Italy
Duration: 7 Apr 20109 Apr 2010
Conference number: 13


  • Contact stress
  • Bending
  • IR-72546
  • METIS-267350
  • Formability


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