Predicting the onset of cracks in bulk metal forming by ductile damage criteria

Peter Christiansen; Chris Valentin Nielsen; Paulo A.F. Martins; Niels Oluf Bay

doi:10.1016/j.proeng.2017.10.1106

Predicting the onset of cracks in bulk metal forming by ductile damage criteria

Peter Christiansen, Chris Valentin Nielsen, Paulo A.F. Martins, Niels Oluf Bay

University of Lisbon

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Abstract

Three different ductile damage criteria, Ayada, normalized Cockcroft and Latham and a new shear stress based criterion taking into account hydrostatic tension, are utilized for predicting the onset of cracks in various deformation processes. It is found that the Ayada criterion predicts well the onset of cracks when they originate from hydrostatic tension. The shear based criterion predicts cracks triggered by shear and the normalized Cockcroft and Latham criterion indicates the overall area of onset of cracks caused by either hydrostatic or shear stresses. However the prediction is not as accurate as the Ayada criterion for cracks caused by hydrostatic tension.

Original language	English
Journal	Procedia Engineering
Volume	207
Pages (from-to)	2048-2053
ISSN	1877-7058
DOIs	https://doi.org/10.1016/j.proeng.2017.10.1106
Publication status	Published - 2017
Event	International Conference on the Technology of Plasticity (ICTP 2017) - Cambridge, United Kingdom Duration: 17 Sept 2017 → 22 Sept 2017

Conference

Conference	International Conference on the Technology of Plasticity (ICTP 2017)
Country/Territory	United Kingdom
City	Cambridge
Period	17/09/2017 → 22/09/2017

Keywords

Metal forming
Ductile damage
Crack initiation

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title = "Predicting the onset of cracks in bulk metal forming by ductile damage criteria",

abstract = "Three different ductile damage criteria, Ayada, normalized Cockcroft and Latham and a new shear stress based criterion taking into account hydrostatic tension, are utilized for predicting the onset of cracks in various deformation processes. It is found that the Ayada criterion predicts well the onset of cracks when they originate from hydrostatic tension. The shear based criterion predicts cracks triggered by shear and the normalized Cockcroft and Latham criterion indicates the overall area of onset of cracks caused by either hydrostatic or shear stresses. However the prediction is not as accurate as the Ayada criterion for cracks caused by hydrostatic tension.",

keywords = "Metal forming, Ductile damage, Crack initiation",

author = "Peter Christiansen and Nielsen, {Chris Valentin} and Martins, {Paulo A.F.} and Bay, {Niels Oluf}",

year = "2017",

doi = "10.1016/j.proeng.2017.10.1106",

language = "English",

volume = "207",

pages = "2048--2053",

journal = "Procedia Engineering",

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publisher = "Elsevier",

note = "International Conference on the Technology of Plasticity (ICTP 2017) ; Conference date: 17-09-2017 Through 22-09-2017",

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AU - Christiansen, Peter

AU - Nielsen, Chris Valentin

AU - Martins, Paulo A.F.

AU - Bay, Niels Oluf

PY - 2017

Y1 - 2017

N2 - Three different ductile damage criteria, Ayada, normalized Cockcroft and Latham and a new shear stress based criterion taking into account hydrostatic tension, are utilized for predicting the onset of cracks in various deformation processes. It is found that the Ayada criterion predicts well the onset of cracks when they originate from hydrostatic tension. The shear based criterion predicts cracks triggered by shear and the normalized Cockcroft and Latham criterion indicates the overall area of onset of cracks caused by either hydrostatic or shear stresses. However the prediction is not as accurate as the Ayada criterion for cracks caused by hydrostatic tension.

AB - Three different ductile damage criteria, Ayada, normalized Cockcroft and Latham and a new shear stress based criterion taking into account hydrostatic tension, are utilized for predicting the onset of cracks in various deformation processes. It is found that the Ayada criterion predicts well the onset of cracks when they originate from hydrostatic tension. The shear based criterion predicts cracks triggered by shear and the normalized Cockcroft and Latham criterion indicates the overall area of onset of cracks caused by either hydrostatic or shear stresses. However the prediction is not as accurate as the Ayada criterion for cracks caused by hydrostatic tension.

KW - Metal forming

KW - Ductile damage

KW - Crack initiation

U2 - 10.1016/j.proeng.2017.10.1106

DO - 10.1016/j.proeng.2017.10.1106

M3 - Conference article

SN - 1877-7058

VL - 207

SP - 2048

EP - 2053

JO - Procedia Engineering

JF - Procedia Engineering

T2 - International Conference on the Technology of Plasticity (ICTP 2017)

Y2 - 17 September 2017 through 22 September 2017

ER -

Predicting the onset of cracks in bulk metal forming by ductile damage criteria

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Keywords

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