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Materials 2017, 10(10), 1185; https://doi.org/10.3390/ma10101185

Experimental and Computational Study of Ductile Fracture in Small Punch Tests

1
Department of Mechanical Engineering, Uludağ University, Görükle, 16059 Bursa, Turkey
2
Chair of Solid Mechanics, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, 42119 Wuppertal, Germany
3
Nuclear Safety and Security Directorate, Joint Research Centre, European Commission, NL-1755 LE Petten, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 20 July 2017 / Revised: 14 August 2017 / Accepted: 24 August 2017 / Published: 17 October 2017
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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. View Full-Text
Keywords: small punch test; P91 steel; ductile fracture; gurson’s plasticity model; nonlocal plasticity small punch test; P91 steel; ductile fracture; gurson’s plasticity model; nonlocal plasticity
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Gülçimen Çakan, B.; Soyarslan, C.; Bargmann, S.; Hähner, P. Experimental and Computational Study of Ductile Fracture in Small Punch Tests. Materials 2017, 10, 1185.

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