Experimental and computational study of ductile fracture in small punch tests

Betül Gülçimen Çakan; Celal Soyarslan; Swantje Bargmann; Peter Hähner

doi:10.3390/ma10101185

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 journal › Article › Academic › peer-review

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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.

Original language	English
Article number	1185
Journal	Materials
Volume	10
Issue number	10
DOIs	https://doi.org/10.3390/ma10101185
Publication status	Published - 17 Oct 2017
Externally published	Yes

Keywords

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

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10.3390/ma10101185Licence: CC BY

Gulcimen-cakan-2017-Experimental-and-computational-studFinal published version, 2.11 MBLicence: CC BY

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title = "Experimental and computational study of ductile fracture in small punch tests",

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.",

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AU - Çakan, Betül Gülçimen

AU - Soyarslan, Celal

AU - Bargmann, Swantje

AU - Hähner, Peter

PY - 2017/10/17

Y1 - 2017/10/17

N2 - 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.

AB - 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.

KW - Ductile fracture

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KW - Nonlocal plasticity

KW - P91 steel

KW - Small punch test

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JO - Materials

JF - Materials

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Experimental and computational study of ductile fracture in small punch tests

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