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Finite element modeling and durability evaluation for rubber pad forming process
conference contribution
posted on 2019-01-01, 00:00 authored by J Park, Y Kim, Jeong YoonJeong Yoon, H So, J Lee, S Ko© Published under licence by IOP Publishing Ltd. Elastomer (or rubber pad) forming is a dieless forming process. The forming process has several advantages compared to general press forming process in terms of tool cost and scratch problem. However, when the elastomer is subjected to severe deformation during forming process, it can result in an expensive cost for the replacements of elastomer. Therefore, it is necessary to evaluate accurate tool life. In this study, the FE analysis was conducted for the rubber pad forming process and the fatigue life evaluation of the elastomer tool was investigated numerically using the reference experimental data. For the FE analysis, uniaxial and equibiaxial tension tests of natural rubber 50 were carried out in order to obtain the mechanical material properties of the elastomer. The hyperelastic behavior of the elastomer was characterized using Ogden model. The elastomer forming process was modeled using a commercial software LS-DYNA 3D. Two important factors of FE modeling were to calibrate the simulation conditions and to obtain the target product shape with a preformed elastomer. With the result of FE analysis, a durability of the elastomer was conducted focusing on fatigue life, because the elastomer is applied for repeated loadings during the forming process. Unlike general fatigue analysis, the fatigue life of the elastomer is predicted with respect to the strain measures due to Mullins effect. Furthermore, the Polar Effective Plastic Strain (PEPS) diagram [6] considering the strain path changes was used to check the failure of the blank during the forming process.
History
Event
International Deep Drawing Research Group. Annual Conference (39th 2019 Enschede, Netherlands)Volume
651Series
IOP Conference Series: Materials Science and EngineeringPagination
1 - 9Publisher
IOP PublishingLocation
Enschede, The NetherlandsPlace of publication
Bristol, EnglandPublisher DOI
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Start date
2019-06-03End date
2019-06-07ISSN
1757-8981eISSN
1757-899XPublication classification
E1 Full written paper - refereedEditor/Contributor(s)
Ton van den Boogaard, Javad Hazrati, Nico LangerakTitle of proceedings
IDDRG 2019 : Proceedings of the International Deep Drawing Research Group 38th International Annual ConferenceUsage metrics
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