Determination of yield point of structural materials with using the metric entropy

• Autorzy: Garbacz G. , Kyzioł L.

Identyfikatory

DOI

10.5604/12314005.1133176

• Języki publikacji: EN

Abstrakty

EN

The yield point is one of the basic characteristics of construction materials, which are used in the design engineering calculations. The methods used to determine the yield point is based on the interpretation of the geometric shape of the curve uniaxial tension. This shape is specific for different construction materials and depends among others to the conditions carrying trials. Specific guidelines for determining the yield point were included in the standards specification. The conventionality of procedure concerns especially materials, which, in their deformation characteristic do not have a distinct top of knee. The authors propose an alternative method based on the use of the concept of the metric entropy by Kolmogorov-Sinai. The metric entropy by Kolmogorov-Sinai is used to study the phenomena about a dynamic character. Therefore, this method requires the recording of more number of measuring points: from a few hundred to a dozen thousand, depending on the type of research of constructional materials. A dynamic character of measurement data results from their scatter, which consists of local, non-linear disturbances occurring during deformation of the material and the noise, associated from the action of acquisition path. The aim of the study is to present a more objective method of determining the yield point structural materials, which do not require the use of conventional procedures. The paper presents the results determining of this constant material on the basis of data records monoaxially stretching of tests for metals used in shipbuilding.

Słowa kluczowe

EN

yield point; construction materials; metric entropy by Kolmogorov-Sinai

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2014
• Tom: Vol. 21, No. 3
• Strony: 97--104
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Garbacz G.

• Opole University of Technology Faculty of Production Engineering and Logistic Prószkowska Street 76, 45-758 Opole, Poland tel.:[phone], fax: [phone]

autor

Kyzioł L.

• Gdynia Maritime University Faculty of Marine Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Dietrich, L., Znaczenie i rozwój badań wytrzymałościowych w złożonych stanach naprężenia, Dozór Techniczny3, 1998.
• [2] Dietrich, L., Garbacz, G., Uwzględnienie chaosu w analizie danych doświadczalnych, XXI Sympozjum Mechaniki Eksperymentalnej Ciała Stałego, Warszawa 2004.
• [3] Dietrich, L., Garbacz G., Wyzaczanie granicy plastyczności materiałów konstrukcyjnych na podstawie entropii metrycznej danych pomiarowych, I Kongres Mechaniki Polskiej, Warszawa 2007.
• [4] Kolmogorov, A. N., Entropy per unit time as a metric invariant of automorphism, Doklady of Russian AcademyofSciences, 124, pp.754-755, 1959.
• [5] Kolmogorov, A. N., New Metric Invariant of Transitive Dynamical Systems and Endomorphisms of Lebesgue Spaces, Doklady of Russian Academy of Sciences, 119, N5, pp. 861-864, 1958.
• [6] Kyzioł, L., Zatorski, Z., Dobrociński, S., Skrzydlak, A., Bohn, M., Wypych, W., Michalski, W., Charakterystyki dynamiczne materiałów na konstrukcje morskie, Sprawozdanie końcowe z pracy pk. Konstruktor, etap I-III, AMW, Gdynia 2002-2004.
• [7] Polska Norma, Próba rozciągania, Metoda badania w temperaturze otoczenia, PN - EN 10002-1+AC1, 1998.
• [8] Sinai, Y. G., On the Notion of Entropy of a Dynamical System, Doklady of Russian Academy ofSciences, 124, 768-771, 1959.