Numerical determination of the forming limit diagrams

• Autorzy: Pepelnjak T. , Kuzman K.
• Konferencja: 12th International Scientific Conference CAM3S'2006, 27-30th November 2006, Gliwice-Zakopane
• Języki publikacji: EN

Abstrakty

EN

Purpose: At present the industrial practice demands a reliable determination of forming limits which assures the prediction of properly selecting the forming process in a digital environment. Therefore, technological limits defined with the forming limit diagrams (FLDs) have to be known. The experimental evaluation of FLDs for sheet metal is time consuming and demands expensive equipment. The experimental work could be omitted by predicting the FLD with numerical simulations. Design/methodology/approach: The paper presents a methodology to determine the entire range of the FLD for sheet metal in a digital environment. The Marciniak testing procedure simulated with the FEM program ABAQUS was selected to determine the FLD. To assure the reliability of the developed method, different materials were analysed: two types of deep drawing steel, an aluminium 3000 alloy, and a Ti-alloy. The selected materials have different mechanical properties and sheet thicknesses ranging from 0.5 mm to 1.23 mm. For the verification of numerically obtained results parallel experimental determinations of the FLDs were performed showing a good correlation between the FLDs obtained by both approaches. Findings: A specially developed method for the evaluation of the thickness strain as a function of time as well as the first and the second time derivation of the thickness strain enable the determination of the onset of necking. Research limitations/implications: The presented method of the digital evaluation of the FLDs is still in a developmental phase and needs further improvements for industrial practice. However, in some cases the numerical approach had already been used for a fast prediction of the FLD prior to performing the experiments. At the current level the developed program still needs an expert to support it in some critical decisions. Originality/value: Considering some methological improvements and automation procedures the developed method could be used in everyday practice.

Słowa kluczowe

EN

numerical techniques; plastic forming; sheet metal; forming limit diagram

PL

techniki numeryczne; obróbka plastyczna; przeróbka plastyczna; blacha; arkusz blachy; wykres odkształceń granicznych

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 20, nr 1-2
• Strony: 375--378
• Opis fizyczny: Bibliogr. 3 poz., rys., tab.

Twórcy

autor

Pepelnjak T.

autor

Kuzman K.

• Faculty of Mechanical Engineering University of Ljubljana, Askerceva 6, SI-1000 Ljubljana, Slovenia,

Bibliografia

• [1] D. Banabic, H.J. Bunge, K. Pöhland, A.E. Tekkaya, Formability of Metallic Materials, Springer Verlag, Germany 2000.
• [2] R. Brun, A. Chambard, M. Lai P. de Luca, Actual and virtual testing techniques for a numerical definition of materials, Proc. NUMISHEET'99, Besançon, France, 1999.393-398.
• [3] A. Petek, T. Pepelnjak, K. Kuzman, New method for determination of FLD in digital environment, Journal of Mechanical Engineering, Vol. 51 (2005), 6, 330-345.