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	Parametric and optimization study of the small punch test Dymáček, Petr ; Iván, L. Finite element method and optimization algorithms were used for sensitivity studies of the Small Punch Test (SPT) to achieve good agreement between measured and computed results. Detailed record
	MKP studie protlačovacích zkoušek na miniaturních discích při podmínkách konstantního zatížení Dymáček, Petr Comparison of results of creep small punch tests (SPT) on miniaturized discs with results of their modeling by means of finite element method (FEM) is presented. Advanced heat resistant chromium steel P91 was selected for the investigations. In the numerical model, the Norton power-law and the exponential relationships were applied. Parameters of both relationships were derived from stress dependences of minimum creep rate obtained from conventional creep tests at 873 K. The FE model included contact elements taking in account the surface friction between all contact surfaces of the test setup. Various material models from elastic&creep to elastic-plastic&creep were applied in the FE model. Obtained results of the numerical analyses were compared with the experimental results. These computational results allow us to better understand the behavior of the specimen at accelerated creep rates and comprehend some of the principally important conditions of the SPT. Detailed record
	Vývoj poškození u protlačovacích zkoušek na miniaturních discích při konstantní rychlosti deformace Dymáček, Petr ; Milička, Karel ; Hrubý, V. In this contribution a set of three steels of various ductility has been selected and tested using small punch technique. The set of specimens was loaded in incremental way, in order to determine at which load level the crack initiates. The location of crack initiation was evaluated and compared with the equivalent plastic strain distributions in the FEM model of the specimen. The findings should help for better comprehension of the fracture mechanisms that can occur in SP testing and recognizing the main differences between the conventional and SP testing. Detailed record

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