ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The use of Finite Element Simulation allows accurate predictions of stress and straindistributions in complex stamped parts. The onset of necking is strongly dependent on the strainpaths imposed to the parts and therefore the prediction of localized necking can be a difficult task.Numerical models of plastic instability have been used to predict such behavior and recent and moreaccurate constitutive models have been applied in these calculations.In many manufacturing areas such as automotive, aerospace, building, packaging and electronicindustries, the optimization of sheet metal processes, through the use of numerical simulations, hasbecome a key factor to a continuously increasing requirement for time and cost efficiency, forquality improvement and materials saving.This paper makes an analysis of the evolution of strain gradients in stamped parts. The combinationof Finite Element Analysis with a Plastic Instability Model, developed to predict localized neckingunder complex strain paths, shows that it is possible to predict failure with precision. Severalconstitutive laws are used and comparisons are made with experiments in stamped benchmark parts.Considering non linear strain paths, as detected in stamped parts, more accurate failure predictionsare achieved. The work described in this paper shows the need to include a post processor analysisof failure, capable of predicting the behavior of the material under non linear strain paths. Takingthis phenomenon into account, it is shown that it is possible to increase the accuracy of the onset oflocalized necking prediction
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.825.pdf
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