Influence of friction on stress and strain distributions in small punch creep test models

0332110 - ÚFM 2010 RIV CH eng J - Journal Article
Dymáček, Petr - Seitl, Stanislav - Milička, Karel - Dobeš, Ferdinand
Influence of friction on stress and strain distributions in small punch creep test models.
Key Engineering Materials. 417-418, - (2010), s. 561-564. ISSN 1013-9826.
[International Conference on Fracture and Damage Mechanics /8./. Malta, 08.09.2009-10.09.2009]
R&D Projects: GA AV ČR(CZ) IAA200410801; GA AV ČR(CZ) 1QS200410502
Institutional research plan: CEZ:AV0Z20410507
Keywords : small punch test * creep * chromium steel * finite element method
Subject RIV: JG - Metallurgy
www.scientific.net/KEM.417-418.561

The FEM modeling of small punch tests on miniaturized thin discs (SPT) of two heat resistant steels was performed. The FE models did represent the creep SPT, i.e. tests with constant acting force. It was shown that different values of the surface friction coefficient used in the calculations have significant impact on the calculated stress and strain state and consequently on the deformed shape of the disc. Thus, the surface friction coefficient should be considered one of the key factors for any correct correlation of SPT and uniaxial creep test results. Proper attention must be paid to the friction conditions during the long term creep deformation. An attempt to define simple approach how to relate the SPT with uniaxial tests is suggested. Some of the calculated results are compared with experiment.
Permanent Link: http://hdl.handle.net/11104/0177450