Derivation of relations and analysis of tube bending processes using discontinuous fields of plastic strains. Part II. Discussion and analysis of the obtained results

• Autorzy: Śloderbach Z.

Identyfikatory

DOI

10.1515/ijame-2015-0028

• Języki publikacji: EN

Abstrakty

EN

This paper presents the calculation results obtained on the basis of three formal simplifications (derived in Part I) gradually led into the main components of the generalized model of strain where suitable simplifications of the 1st, 2nd and 3rd type have been obtained. The paper also presents the results of considerations on the Wall thickness distribution in the vertex point of the elongated layers of the bent elbow, and values of main components of the strain state and intensity of the strain (equivalent strain) depending on the bending angle for the generalized strain scheme and three simplified methods. The results are shown in the form of graphs and table.

Słowa kluczowe

EN

three simplifications; strains; wall thickness; allovable strains and ovalization

PL

naprężenia; odkształcenia; gięcie rur

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2015
• Tom: Vol. 20, no. 1
• Strony: 427--435
• Opis fizyczny: Bibliogr. 25 poz., tab., wykr.

Twórcy

autor

Śloderbach Z.

• Opole University of Technology Faculty of Applications of Chemistry and Mechanics 45-036 Opole, Luboszycka 7, POLAND

Bibliografia

• [1] Dobosiewicz J. and Wojczyk K. (1988): Life assessment in steam pipeline bends (in Polish). – Energetics, No.3, Katowice, pp.88-90.
• [2] Dzidowski E.S. and Cisek W. (2001): New development in mechnics of shear fracture research. – Journal of Materiale Processing Technology, No.106, Kraków, pp.267-272.
• [3] Dzidowski E.S. and Strauchold Sz. (1998): Effect of technological factors in pipe bending on damage characteristics and reliability of power pipelines (in Polish). – Scientifics Paper of the Opole Technical University, Series Eletrical, vol.46, Opole, pp.119-125.
• [4] El-Sebaie M.G. and Mellor P.B. (1972): Plastic instability conditions in the deep-drawing of a circular blank of sheet metal. – International Journal of Mechanical Science, vol.14, pp.91-101.
• [5] EN 13445-4. (2009): Unfired Pressure Vessels – Part 4: Fabrication, Tube Bents, or earlier: Draft Standart EN UFPV, (1996): Unfired Pressure Vessels – Part 4, Manufacture. - CEN/TC54/267 JWGB N277, rev. 5.
• [6] Franz W.D. (1961): Das Kalt-Biegen von Rohren. – Berlin: Springer-Verlag.
• [7] Gabryszewski Z. and Gronostajski J. (1991): Fundamentals of Metal-Working Processes. – Warsaw: WNT.
• [8] Gabryszewski Z. (2001): Theory of elasticity and plasticity (in Polish). – Publishing House of Wrocław University of Technology, ISBN 83-7085-534-2. - Wroclaw.
• [9] Korzemski J.W. (1971): Bending of Thin-Walled Pipes (in Polish). – Warsaw: WNT.
• [10] Marciniak Z. (1971): Limit Deformations in Sheet Metal Forming (in Polish). – Warsaw: WNT.
• [11] Moore G.G. and Wallace J.F. 1964/65): The effect of anisotropy on instability in sheet-metal forming. – Journal of the Institute of Metals, vol.93, No.2, pp.33-38.
• [12] Seyna F. and Ginalski J. (1989): Evaluation of residual life in steam pipelines (in Polish). – Technical Inspection, No.3, Warsaw, pp.103-106.
• [13] Seyna F. and Ginalski J. (1987): Long-term safe use of steam pipelines (in Polish). – Energetics, No.6, Katowice, pp.214-217.
• [14] Śloderbach Z. and Sawicki T. (1983): Determination of the critical adiabatical twisting moment in the case of thick and thin-walled metal tubes. – Engineering Transactions, vol.31, No.4, Warsaw, pp.447-457.
• [15] Śloderbach Z. (1999): A model for strain geometry evaluation in pipe bending processes. – Engineering Transactions, vol.47, No.1, pp.3-20.
• [16] Śloderbach Z. and Rechul Z. (2000): Effect of strain hardening and normal anisotropy on allowable values of strain and stress in pipe-bending processes. – Journal of Theoretical and Applied Mechanics, vol.38, No.4, pp.843-859.
• [17] Śloderbach Z.(2002): Some problems of mechanics in pipeline bending processes (in Polish). – Publishing House of Wrocław University of Technology, ISBN 83-7085-665-9, Wrocław, pp.1-218.
• [18] Śloderbach Z. (2013): Application of the kinematically admissible fields of plastic deformation in pipe bending processes. Part I. Derivation of basic equations and expressions. – Manufacturing Processes. Actual Problems – 2013. vol.1. Basic Science Applications in Manufacturing Pricesses, Opole University of Technology, ISBN 978-83-64056-37-6, Opole, pp.11-20.
• [19] Śloderbach Z. (2013): Application of the kinematically admissible fields of plastic deformation in pipe bending processes. Part II. Discusion and analysis of obtained results. – Manufacturing Processes. Actual Problems – 2013. vol.1. Basic Science Applications in Manufacturing Processes, Opole University of Technology, ISBN 978-83-64056-37-6, Opole, pp.21-30.
• [20] Śloderbach Z. (2014): A derivation of the genaralized model of plastic strains during bending of metal tubes at bending machines. – International Journal of Applied Mechanics and Engineering, vol.19, No.1, pp.145-163.
• [21] Tang N.C. (2000): Plastic-deformation analysis in tube bending processes. – International Journal of Pressure Vessels and Piping, 77, 12, Elsevier, UK, pp.751-759.
• [22] UDT CONDITIONS (WUDT-UC-WO-O/02:10). (2003): Pressure Installations. General Requirements. Bendig Elbows. Strength Calculations (in Polish). – Issue I, Warsaw.
• [23] Zdankiewicz M. (1998): EU Instruction concerning pressure devices. Requirements concerning manufacturing [In Polish]. – Technical Inspection, vol.2/98, Warsaw, pp.25-33 and 48.
• [24] Życzkowski M. (1981): Complex loading in theory of plasticity. – Warsaw - Alphen aan den Rijn, PWN - Nijhoff.
• [25] Życzkowski M. and Tran L.B. (1997): Interaction curves corresponding to the decohesive carrying capacity of a cylindrical shell under combined loading. – International Journal of Plasticity, vol.13, pp.551-570.