Rietman, Bert

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Finite Elements for Better Understanding of Compression Tests

University of Twente Research Information

First Engineering MechanicsSymposium23 - 24 November 1998Rolduc, KerkradeGraduate School Engineering Mechanicsc/o Eindhoven University of TechnologyPO Box 513, building W-hoog 0.1435600 MB Eindhoven NLTel.: #31.(0)40.247 48 17Fax.: #31.(0)40.246 14 18E-mail: EMschool@tue.nlInternet: http://www.em.tue.nlFirst Engineering Mechanics Symposiurm, Nov. 1998 20Finite Elements for Better Understanding ofCompression TestsBert RietmanUniversity of Twente, Twente Institute of MechanicsP.O. Box 217, 7500 AE Enschedephone +31-(0)53-4894360, email a.d.rietman@wb.utwente.nlCompression tests are commonly used experimental devices to obtain the mechanical behavior of awhole series of materials. The response to a prescribed deformation is measured and fitted with amaterial model. This is a straight forward calculation in case of a uniaxial state of compression.Usually a homogeneous deformation cannot be maintained during deformation. Finite elementcalculations can lead to a better understanding and possibly a higher accuracy of the obtainedmechanical behavior.Calculations show that corrections for inhomogeneity basically can lead to correct material behavior.Main problem however remains the fact that friction conditions in practice are not exactly known andmay even vary during testing. It is shown that several constraints can be made to the tool andworkpiece geometry.

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Finite Elements for Better Understanding of Compression Tests

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