Sheet Thickness Reduction Influence on Fracture Strain Determination

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F18%3AN0000035" target="_blank" >RIV/26316919:_____/18:N0000035 - isvavai.cz</a>

Result on the web

<a href="http://iopscience.iop.org/article/10.1088/1742-6596/896/1/012082/pdf" target="_blank" >http://iopscience.iop.org/article/10.1088/1742-6596/896/1/012082/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1063/1/012168" target="_blank" >10.1088/1742-6596/1063/1/012168</a>

Result language

angličtina

Original language name

Sheet Thickness Reduction Influence on Fracture Strain Determination

Original language description

Standardly, the FLC curve [11] is determined based on ISO12004 according to Nakajima test or Marciniak test [1]. There are two basic influences: the friction between the punch and the specimen and at the same time the pushing the punch on the specimen, which affects the strain distribution over the sheet thickness [17]. The main disadvantage of these tests is the measurement of the linear deformation paths only, but the real forming processes are usually formed in multiple steps processes and the loading path is strongly non-linear. The current trend for sheets formability assessment is investigation of non-linear deformation paths performed on cruciform specimens [2, 3] or using a combination of Marciniak and Nakajima tests [6], [7]. The cruciform specimens should have reduced thickness in the central part in order to assure main plastic deformation and fracture in this region [18]. However, there are indications that the thickness reduction can influence results of the formability assessment. The main goal of this present paper, is experimental investigation of effect of local material thickness reduction on FLC and on Fracture Forming Limit Curve (FFLC). The cruciform specimens with a reduced thickness is investigated with the use of the biaxial stand without friction and pushing the punch. All results are compared to the FLC values.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/LO1412" target="_blank" >LO1412: Development of the West Bohemian Centre of Materials and Metallurgy</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

NUMISHEET 2018: 11th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

ISBN

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ISSN

1742-6588

e-ISSN

1742-6596

Number of pages

8

Pages from-to

nestránkováno

Publisher name

IOP Publishing Ltd.

Place of publication

Bristol

Event location

Tokio, Japonsko

Event date

Jul 30, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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