Experimental and computational study of ductile fracture in small punch tests

Betül Gülçimen Çakan*, Celal Soyarslan, Swantje Bargmann, Peter Hähner

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
35 Downloads (Pure)

Abstract

A unified experimental-computational study on ductile fracture initiation and propagation during small punch testing is presented. Tests are carried out at room temperature with unnotched disks of different thicknesses where large-scale yielding prevails. In thinner specimens, the fracture occurs with severe necking under membrane tension, whereas for thicker ones a through thickness shearing mode prevails changing the crack orientation relative to the loading direction. Computational studies involve finite element simulations using a shear modified Gurson-Tvergaard-Needleman porous plasticity model with an integral-type nonlocal formulation. The predicted punch load-displacement curves and deformed profiles are in good agreement with the experimental results.

Original languageEnglish
Article number1185
JournalMaterials
Volume10
Issue number10
DOIs
Publication statusPublished - 17 Oct 2017
Externally publishedYes

Keywords

  • Ductile fracture
  • Gurson's plasticity model
  • Nonlocal plasticity
  • P91 steel
  • Small punch test

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