Chevron crack initiation in mullti-pass drawing of inclusion copper shaped-wire
คำสำคัญ:
Copper shaped-wire, Cracks initiation, Chevron cracks, Ductile fracture criterionบทคัดย่อ
In the copper superfine wire drawing, the internal cracks such as chevron cracks and breakage of the wire were fatal to the success of quantitative drawing operations. This paper shows how the main process parameters, the drawing pass numbers, influence the plastic deformation, hydrostatic stress, maximum principal tensile stress and chevron cracks initiation investigated by FEM simulation. The effect of the lateral and longitudinal sizes of a central cylindrical inclusion in the multi-pass copper shaped-wire drawing was studied. The plastic deformation, plastic strain, hydrostatic stress and maximum principal tensile stress of the copper shaped-wire containing an inclusion were obtained from simulation results. A ductile fracture criterion was chosen from literature, a large number of ductile fracture initiation criteria, to predict the chevron crack initiation of the drawn copper shaped-wire for this investigation. The problem of chevron cracks initiation for the investigated material was solved. This investigation provided very good results.Downloads
เอกสารอ้างอิง
Nikkei-Mechanical (2000). The motor efficiency competition. Tokyo, Nikkei: 40-44.
Yoshida, K. (2000). Technological trend and problem of wire drawing of various super fire wires J. Jpn. Soc. Technol. Plast. 41: 194-198.
Raskin, C. (1997) In: Proceedings of the WAI International Technical Conference. Italy.
Amstead, B. H., Ostwald, P. F. & Begeman, M. L. (1987). Manufacturing processes. Singapore, Wiley: 1-687.
Johnson, H. V. (1984). Manufacturing processes. Bennett & McKnight: 14-581.
Kutz, M. (1998). Mechanical engineers’ handbook. New York, NY: Wiley: 3-1205.
Colangelo, V. J. & Heiser, F. A. (1989). Analysis of metallurgical failures. Singapore: Wiley: 240-322.
Avitzur, B. (1968). Metal forming: Processes and analysis. New York, NY: McGrawHill: 153-258.
Avitzur, B. (1971). Study of flow through conical converging dies. In A. L. Hoffmanner (Ed.). Metal forming: Interrelation between theory and practice. New York, NY: Plenum Press: 1-46.
Garrison Jr., W. M. & Moody, N. R. (1987). Ductile fracture. J. Phys. Chem. Solids 48(11): 1035-1074.
Campos, H. B. & Cetlin, P. R. (1998). The influence of die semi-angle and of the coefficient of friction on the uniform tensile elongation of drawn copper bars. J. Mater. Process. Tech. 80-81(1): 388-391.
De Castro, A. L. R., Campos, H. B. & Cetlin, P. R. (1996.) Influence of die semi-angle on mechanical properties of single and multiple pass drawn copper. J. Mater. Process. Tech. 60(1-4): 179-182
Norasethasopon, S. & Yoshida, K. (2006). Influences of inclusion shape and size in drawing of copper shaped-wire. J. Mater. Process. Tech. 172(3): 400-406.
Norasethasopon, S. & Yoshida, K. (2006). Finiteelement simulation of inclusion size effects on copper shaped-wire drawing. Mat. Sci. Eng. A-Struct. 422(1-2): 252-258.
Cockcroft, M. G. & Latham, D. J. (1968). Ductility and workability of metals. J. Inst. Met. 96: 33-39.
Edward, M.M. (1991). Metalworking science and engineering. New York, NY: McGraw- Hill: 397-462
Freudenthal, A. M. (1950). The inelastic behavior of solids. New York, NY: Wiley.
Clift, S.E, Hartley, P., Sturgess, C.E.N. & Rowe, G.W. (1990). Fracture prediction in plastic deformation processes. Int. J. Mech. Sci. 32(1): 1–17.
ดาวน์โหลด
เผยแพร่แล้ว
วิธีการอ้างอิง
ฉบับ
บท
การอนุญาต
ลิขสิทธิ์ (c) 2017 วารสารโลหะ, วัสดุ และแร่
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors who publish in this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
