Design of Flexible Bulge Testing System for Evaluating the Influence of Size Effect on Thin Metal Sheets

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Abstract:

Formability in sheet forming processes are usually analyzed by standardized tests, which often requires different test equipment associated with high initial investment cost. The present study purposes a flexible test tooling system for hydraulic bugle test apparatus that allows to evaluate the impact of size effect on the formability of thin metallic sheets. Finite Element Method was used for concept and design of the tooling system and experimental tests were carried out with thin sheets of SUS316L stainless steel to assess the overall performance of the tooling system.

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199-204

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April 2018

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[1] S.P. Keeler, Circular Grid System – a valuable aid for evaluating sheet metal formability, SAE Technical Paper 680092, (1968).

DOI: 10.4271/680092

Google Scholar

[2] G. Goodwin, Application of strain analysis to sheet metal forming problems in the press shop, SAE Technical Paper 68009, (1968).

DOI: 10.4271/680093

Google Scholar

[3] ISO Standard 12004-2, Metallic Materials - Sheet and Strip - Determination of Forming-Limit Curves Part 2: Determination of Forming Limit Curves in the Laboratory, Geneva, Switzerland, (2008).

DOI: 10.3403/30150423u

Google Scholar

[4] S. Mahabunphachai, M. Koc, Investigation of size effects on material behavior of thin sheet metals using hydraulic bulge testing at micro/meso-scaled, Int. J. Mach. Tools Manu. 48 (2008) 1014-1029.

DOI: 10.1016/j.ijmachtools.2008.01.006

Google Scholar

[5] Y.Y. Chen, Y.C. Tsai, C.H. Hung, Integrated Hydraulic Bulge and Forming Limit Testing Method and Apparatus for Sheet Metals, Key Eng. Mater. 626 (2015) 171-177.

DOI: 10.4028/www.scientific.net/kem.626.171

Google Scholar

[6] ASTM Standard E8/E8M, Standard Test Methods for Tension Testing of Metallic Materials, ASTM International, West Conshohocken, USA, (2013).

Google Scholar

[7] R. Hill, A theory of plastic bulging of a metal diaphragm by lateral pressure, Phil. Mag. Series 7, 41 (1950) 1133-1142.

Google Scholar

[8] W. Panknin, Der Hrdraulisch Tiefungsversuch und die Ermittlung von Fieβkurven (The hydraulic bulge test and the determination of the flow stress curves), Dissertation, Institute for Metal Forming Technology, University of Stuttgart, Germany, (1959).

Google Scholar

[9] M. Koç. E. Billur and Ö. N, Cora, An experimental study on the comparative assessment of hydraulic bulge test analysis methods, Mater. Design 32 (2011) 272-281.

DOI: 10.1016/j.matdes.2010.05.057

Google Scholar

[10] Z. Marciniak, J.L. Duncan and S.J. Hu, Mechanics of Sheet Metal Forming, Second ed., Butterworth-Heinemann, (2002).

Google Scholar

[11] A.a. Kruglov, F.U. Enikeev and R.Ya. Lutfullin, Superplastic forming of a spherical shell out a welded envelop, Mat. Sci. Eng. A, 323, 1-2 (2002) 416-426.

DOI: 10.1016/s0921-5093(01)01376-4

Google Scholar

[12] G. Gutscher. H.C. Wu, G. Ngaile and T. Altan, Determination of flow stress for sheet metal forming using the viscous pressure bulge (VPB) test, J. Mater. Process. Tech. 146 (2004) 1-7.

DOI: 10.1016/s0924-0136(03)00838-0

Google Scholar