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Plastic Anisotropy, Strain Hardening, Strain State, Forming Limit, Sheet Metal.


In the prediction of formability of sheet metals, it is necessary to determine material properties which are normally evaluated on the data obtained by performing simple tests. The most important parameters affecting the value of limit strains of a sheet metal are the strain hardening exponent (n) and plastic anisotropy ratio (r). It was established that especially the value of n-parameter of brass sheets strongly depend on the specimen elongation and stress/strain state. The effect of instantaneous (differential) nt - value and rt - value on the forming limit curve was computed theoretically.


Acta Mechanica Slovaca. Volume 15, Issue 1, Pages 22 – 27, ISSN 1335-2393


  Instantaneous Plastic Flow Properties of Thin Brass Sheets Under Uniaxial and Biaxial Testing


[1] Pereira I.M., Rubim G., Acselrad O., Cetlin P.R., Comparison of the experimental and the numerically predicted mechanical damage in the sheet forming of steel, Journal of Materials Processing Technology, vol. 203, 2008, p. 13-18

[2] Doucet A.B., Wagoner R.H., Transient tensile behavior of Intersitial-Free steel and 70/30 brass following plane-strain deformation. Metallurgical Transactions, vol. 20A, 1989, p.1483-1493
[3] Vial C., Yield locus of 70-30 brass sheets, International Journal of Mechanical Science, vol.30, No. 2, 1988, p. 137-145
[4] Shi M.F., Strain hardening and forming limits of automotive steels, SAE Transactions, vol.104, 1995, p. 571-577
[5] Mahmudi R., Stress-state dependence of workhardening behavior in aluminium alloy sheet, Journal of Materials Processing Technology, vol. 72, 1997, p. 302-307
[6] An Y.G., Vegter H., Elliot L., A novel and simple method for the measurement of plane strain work hardening, Journal of Materials Processing Technology, vol. 155-156, 2004, p. 1616-1622
[7] Slota J., Spišak E., Determination of flow stress by the hydraulic bulge test, Metalurgija, vol.47, no. 1, 2008, p. 13-17
[8] Dournaux J.L., Bouvier S., Aouafi A., Vacher P., Full-field measurement technique and its application to the analysis of materials behaviour under plane strain, Materials Science and Engineering A, vol. A 500, 2009, p. 47-62
[9] Stachowicz F., On the mechanical and geometric inhomogeneity and formability of aluminium and aluminium alloy sheets. Archives of Metallurgy, vol. 41, no. 1, 1996, p. 61-75
[10] Ghosh A.K. Plastic flow properties in relation to localized necking in sheets. In D.P. Koistinen & N-M. Wang (ed.), Mechanics of sheet metal forming, Plenum Press. New York 1978, p. 287-312
[11] Rao K.P., Mohan E.V.R., A unified test for evaluating material parameters for use in the modelling of sheet metal forming, Journal of Materials Processing Technology, vol. 113, 2001, p.725-731
[12] Chamanfar A., Mahmudi R., Compensation of elastic strains in the determination of plastic strain ratio (R) in sheet metals, Materials Science and Engineering A, vol. A 397, 2005
[13] Welch P.I., Ratke L., Bunge H-J., Consideration of anisotropy parameters in polycrystalline metals, Zeitschrift für Metallkunde, vol. 74, 1983, p. 233-237
[14] Hill R., J.W. Hutchinson, Instantaneous hardening in sheet metal under biaxial loading: A theoretical framework, Journal of Applied Mechanics, vol. 59, 1992, p. S1-S9
[15] Ding Hao, Ding Hua, Song D., Tang Z., Yang P., Strain hardening behavior of a TRIP/TWIP steel with 18,8% Mn, Materials Science and Engineering A, vol. A 528, 2011,

p. 868-873
[16] Gracio J.J., Fernandez J.V., Schmitt J.H., Effect of grain size on substructural evolution and plastic behavior of copper. Materials Science and Engineering A, vol. A 118, 1989, p. 97-105
[17] Marciniak Z., Kuczyński K., Limit strain in the process of stretch forming of sheet metals, International Journal of Mechanical Science, vol. 9, No, 1967, p. 609-624
[18] Stachowicz F., Effect of material inhomogeneity on forming limits of 85-15 brass sheets, Archives of Metallurgy, vol. 36, no. 2, 1991, p.223-242

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