Study on formability in warm press forming of magnesium alloy sheet
| Project/Area Number |
16560089
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Yuge National College of Maritime Technology |
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Principal Investigator |
NAKA Tetsuo Yuge National College of Maritime Technology, Maritime Technology Department, Professor, 商船学科, 教授 (90217638)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Mg alloy sheet / Strain-rate / Temperature / Warm press formin / Yield locus / Biaxial tensile test / Forming limit diagram / Stretch-forming test / マグネシウム合金板 / 温間プレス成形 / 機械的性質 / 降伏曲面 / 降伏関数 / 成形温度 / 成形速度 |
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| Research Abstract |
In the warm press forming of the AZ31 magnesium alloy sheet, because a highly accurate analysis is done, it is very important to decide the speed a proper forming temperature. Moreover, the examination by the difference of the grain size and sheet thickness is also important.
To do the investigation examination of the influence of the working temperature, the speed, the grain size, and sheet thickness that caused it for the yield surface, to the first the warm biaxial tension test was done at various temperatures and the speeds. Moreover, the yield surface and the equal plastic work curved surface were analyzed by using the result of the uniaxial tension test, and using a typical yield function. The yield function used for the warm working's highly accurate analysis from the data of uniaxis and the result biaxial tension test was able to be identified, and a powerful result that a highly accurate analysis was able to be done was shown. Moreover, the experimental result by the difference
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of the temperature, the velocity dependence, and the grain size and the sheet thickness of the yield surface and the equal plastic work curved surface was shown.
Forming limit diagram (FLD) that was the indication of an important brettice compactibility for discussing the warm pressing fabrication with The Second was investigated and examined. The examination used the board that sheet thickness was equal and the grain size is different. The test equipment requested the forming limit warpage at various temperatures and the speeds with a ballhead punch punch stretch forming test machine. As a result, the temperature, the strain-rate dependence in the forming limit diagram, and the experimental result by the difference of the grain size were shown. An analytical forecast in FLD by which the working temperature and the speed of the forming limit warpage. considered influencing by using the requested work-hardening exponent (n-value) and the strain rate sensitivity index (m-value) from this forming limit diagram and the uniaxial stretching test did the comparison and the examination. Because the warpage ratio newly added ductile fracture conditional expression of Oyane to the analysis by a past M-K theory in a positive region, the analytic value and experimental measurements showed becoming the equal or more in this analysis. It was shown that the forecast of FLD of the warm became possible by the M-K analysis in consideration of the influence of the tern and the speed of the n-value and the m-value if there was data that the temperature and the speed by the uniaxial stretching test are different according to this. Less
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Report
(3 results)
Research Products
(4 results)
