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In-situ testing and heterogeneity of UFG Cu at elevated temperatures

Petrenec M., Král P., Dvořák J., Svoboda M., Sklenička V.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 62, nr 2

69--74

EN

Purpose: The motivation of present investigation is the study of deformation-induced processes during in-situ tensile and compression test at elevated temperature in order to elucidate the role of the microstructure changes during creep testing. Design/methodology/approach: Experiments were conducted to investigate deformation-induced processes during in-situ tensile test at elevated temperature. Findings: It was found that creep resistance of UFG pure Al and Cu is considerably improved after one ECAP pass in comparison with coarse grained material, however, further repetitive pressing leads to a noticeable deterioration in creep properties of ECAP material. Researches limitations/implications: In the present work was found that ultrafine-grained microstructure is instable and significant grain growth has already occurred during heating to the testing temperature. Originality/value: The experiments conducted on pure Al and Cu found that their creep resistance is considerably improved after one ECAP pass in comparison with unpressed material.

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Reliability theory

Janošková K., Král P.

Autobusy : technika, eksploatacja, systemy transportowe

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2013

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R. 14, nr 3

1053-1058

EN

The contribution deals with the issue of reliability theory and its principles used in the field of reliability engineering. The contribution focuses attention on the mutual linkage among risk engineering, quality engineering and reliability engineering, defines the term of reliability and clarifies reliability theory in general. The article gives an overview of the most frequently used indicators widely used in reliability theory such as probability density of failure occurring, mean and (high) failure rate, mean time between failures, mean time to failure, average life etc. and briefly defines selected reliability systems used in reliability analyses.

3

Profit margin in supply chain model

Král P., Janošková K.

Autobusy : technika, eksploatacja, systemy transportowe

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2013

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R. 14, nr 3

1059-1064

EN

This contribution clarifies basic principles of profit margin in supply chain theory, defines the term supply chain, deals with the issue of double margin and determines quantitative characteristics of serial, parallel and mixed supply chain model of multiply margin.