| Project/Area Number |
63550510
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | Kyushu University |
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Principal Investigator |
ONODERA Ryuta Kyushu University, Faculty of Engineering, Dept. of Metallurgy, Professor, 工学部, 教授 (40038021)
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| Co-Investigator(Kenkyū-buntansha) |
ARAMAKI Masatoshi Kyushu University, Faculty of Engineering, Dept. of Metallurgy, Researcher, 工学部, 助手 (50175973)
ERA Hidenori Kyushu Institute of Technology, Faculty of Engng. Dept. of Mater. Sci. and Engng, 工学部, 助教授 (00127987)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Composite material / Bimetal Rod / Powder material / Wire drawing / Hydrostatic extrusion / Numerical Analysis / 複合材料 / 破断 / 実験的研究 / エネルギー解析 |
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| Research Abstract |
Three subjects were studied;(1) effects of relative strength (Y_A/Y_B) and relative size of core (r_A/r_B) and extrusion ratio (R) on the workability of bimetal rods with hard core (A) and soft sleeve (B) (2) effect of working method on the workability of powder-packed metal tubes and (3) numerical analysis for deformation of bimetal rods during extrusion.
(1) Workability of bimetal rods: The experiments were carried out using Al alloys and copper as core material and aluminum and lead as sleeve (Y_A/Y_B=3-12), ranging from .3 to .9 of R_A/r_B. (a) The effect of R was not remarkable if R>1.5, but in the range of R>1.5 the decrease of R was of advantage to proportional (sound) extrusion of the rod with small r_A/r_B. (b) The proportional extrusion was more easily done for medium value of r_A/r_B than for small of large value. (c) The fracture mode for small value of r_A/r_B was periodic necking of core and that for large value was cracking of sleeve.
(2) Workability of powder-packed metal tubes: Three types of metal working, namely, hydrostatic extrusion, swaging and roller dies drawing were done on 6 mm Ag tube (1mm thickness) filled by alumina powder (<.3 m dia.). The proportional forming was carried out in hydrostatic extrusion and swaging, but cracking of sleeve was occasionally observed in roller dies drawing, which will be attributed to change of the sectional shape of tube to ellipse.
(3) Numerical analysis: Under some assumptions the strain distribution of core along the longitudinal direction was estimated by the variation method, which should give the minimum deformation energy for a given extrusion increment. The shape of core in extruded rod was determined by the strain distribution. The results of simulation has good agreement with experimental result.
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