Effects of Inclusion on Inclusion Front Tensile Stress

Somchai Norasethasopon

Authors

Somchai Norasethasopon Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute ofTechnology, Ladkrabang, Bangkok 10520, Thailand.

Keywords:

wire fracture, 2D FEA, copper shaped-wire, inclusion, mean normal stress

Abstract

The purpose of this research was to investigate the effect of inclusion on inclusion front tensile stress during copper shaped-wire drawing. The effect of inclusion length on copper shaped-wire drawing was investigated. The deformations and the mean normal stress (σ_m) of copper shaped-wires that contain an inclusion were calculated by two-dimensional finite elemental analysis. As the FEA results, while the inclusion passed through the die, the neck due to inclusion wire drawing occurred on some parts of copper wire surface in front of and near the leading edge of the inclusion. The effect of inclusion length (L_i/D_o) on tensile stress in front of inclusion during copper shaped-wire drawing was carried out. For L_i/D_o > 1.0 the inclusion length did not effect on inclusion front tensile stress. In case of 1 > L_i/D_o > 0.2 and L_i/D_o < 0.2, inclusion length slightly and strongly influences on inclusion front tensile stress, respectively.

References

Avitzur, B. 1968. Metal Forming: Processes and Analysis. McGraw-Hill, New York, pp. 153-258.

Avitzur, B. 1968. Analysis of central bursting defects in extrusion and wire drawing. Trans. ASME, Ser.B, Vol.90, pp. 79-91.

Avitzur, B. 1971. Study of Flow Through Conocal Converging Dies, Metal Forming. A.L. Hoffmanner (ed.), Plenum Press, New York, pp. 1-46.

Coffin , L.F. and Roger, H.C. 1967. Occurrence of damage and voids during wire drawing. Trans. ASME, Vol.60, pp. 672-686.

Chen, C.C., Oh, S.I. and Kobayashi, S. 1979. Ductile fracture in axisymmetric extrusion and drawing. Trans Trans. ASME, Ser.B, Vol.101, pp.23-44.

Mielnik, E.M. 1991. Metalworking Science and Engineering. McGraw-Hill, Inc., New York, pp. 397-462.

Morton, J. 1999. Thomas Bolton & Sons and the rise of the electrical Industry. Engineering Science and Education Journal, Vol.14, pp. 5-12.

Norasethasopon, S. and Tangsri, T. 2001. Experimental Study of the Effect of a Half-Die Angle on Drawing Stress During Wire Drawing. Ladkrabang Engineering Journal, Vol.18, pp. 134-139. (Thai)

Tanaka, H. and Yoshida, K. 1979. Relation between oxygen contents and the cupping of tough pitch copper wire. J. of the Japan Institute of Metals, Vol.43, pp. 618-625.

Yoshida, K. 1982. Study on cuppy defects in wire drawing. Doctor dissertation at Tokai Univ.Japan, pp.1-360.

Yoshida, K. and Tanaka H. 1987. Cup-shaped defect in copper wires drawn from rods of continuous casting and rolling. Advanced Technology of Plasticity, Germany, Vol.2, pp. 857-862.

Yoshida, K. 2000. FEM analysis of wire breaks in drawing of superfine wire with an inclusion. Wire J. International, Vol.33, pp. 102-107.

Yoshida, K. 2000. Fracture of Superfine Metallic Wires. J. of the Japan Society for Technology of Plasticity, Vol.41, pp. 194-198.