Determination of mechanical properties of light alloys and composites by means of Small Punch Testing

0450542 - ÚFM 2016 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Bártková, Denisa - Langer, J. - Dymáček, Petr - Válka, L.
Determination of mechanical properties of light alloys and composites by means of Small Punch Testing.
Multi-level Design of Advanced Materials. Brno: Brno University of Technology, 2015 - (Dlouhý, I.; Jan, V.; Maca, K.; Válka, L.), s. 59-65. ISBN 978-80-214-5146-9.
[Multi-level Design of Advanced Materials. Velké Bílovice (CZ), 28.05.2015-29.05.2015]
Grant CEP: GA MŠMT EE2.3.20.0197
Institucionální podpora: RVO:68081723
Klíčová slova: Small Punch Test * Magnesium Alloys * Aluminium Alloys Thin Disc
Kód oboru RIV: JG - Hutnictví, kovové materiály

Nowadays, in many testing areas a volume of experimental material is limited (laboratory-scaled volume, semidestructive approach). Therefore many testing techniques on miniature samples were devised. Principle of Small Punch Test (SPT) method is a penetration of small puncher through thin disc placed on a ring until the disc bursts. In dependence on loading mode it can provide information comparable to uniaxial tensile tests (UTT) and/or conventional constant load creep tests. However clarification of relations between SPT and conventional methods is difficult and empirical formulas are non-universal. The aim of this study is to i) evaluate mechanical properties of aluminium and magnesium alloys and its composites by means of SPT, ii) compare SPT results with UTT, iii) validate correlation formulas from literature, iv) propose more advanced approach to define correlation between UTT and SPT. Measurement were carried out at constant deflection rate (SPT-CDR) in two different laboratoires. Results from both laboratories were compared to evaluate the reproducibility of the method. Better results agreement was reached for the ultimate strength measurements. Yield strength results exhibited greater variance. An influence of pre-deformation of the sample on yield strength and deflection at maximum force was also identified. We can conclude, that for quantitative estimation of strength parameters we can use correlation formulas based on materials with similar composition and fracture behaviour.
Trvalý link: http://hdl.handle.net/11104/0252731