RT Journal Article SR Electronic A1 Chotěborský, R. A1 Herák, D. A1 Bezouška, V. A1 Hrabě, P. A1 Müller, M. T1 Mathematical function for the transition curves description JF Research in Agricultural Engineering YR 2005 VO 51 IS 3 SP 85 OP 90 DO 10.17221/4908-RAE UL https://rae.agriculturejournals.cz/artkey/rae-200503-0003.php AB Toughness is one of important material properties. At present steel is still the most used material. Owing to the temperature this material can fail both brittly and ductily. Therefore we look for the temperature above which the material will failur ductily. The Charpy impact test is one of methods how to determine the ductility by the temperature - transition access in the determined temperature range. The measured data file is large and it requires the interlay by a curve which presents the relation between the impact energy and the temperature.