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& !2_?/<DC09a LN

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Proof stress σ 0. 2 / MPa 147 31 33 Elongation δ / d 102 q129 29 q37 Work-hardening exponent n 0.05 q013* 020 q021*

Plastic modulus C / MPa 240 q310* 160 q167*

Young's modulus E / GPa 68.6

* σ = C ε netest piece JIS Z 2201 13Bf

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1) ýŜºz–ăŷzƓƷȅħz¹DžȑéȖŽŃȊů

VX]mĺǬƉUhgw{m1FĻļĽİĸ ÌĬLj3ǾƎƾ¼ǧĬLj21-1pp . 46 -54 (2009) 2) F. J. Fuch. JrȖWave bending Design Analysis –Theory of

Bending and Formulae for Determination of Wall Thicknesses –The Bell System Technical Journal38-6 pp.1457-1484 (1959)

3) ªųƽˆȖį¯ęŖ3Ō¹Ć1FXiuyS

c[RǐśŇŕŧşò2005čďčŨíǝŹǜ łȇ(1)pp . 621- 622 (2005)

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ǻį¯ęŖ3Ō¹Ć1Fƭď.ȁƋƗơǸ

ãÒŎNo . 36 (1999)

5) Shuji SAKAKIzNoah UTSUMIȖFactors Causing Undesirable Deformations during the Bending of Extruded Sections Material Transaction47-5pp.1354 -1359 (2006)

6) ªųƽˆzÝŔŨȖLvlaNmį¯ǏƩ3Ł

êęJĭ´&×ǨĕŌ¹ĆŰLv_fL 29-2pp.18-26 (1999)

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ÞƧŌ1FXiuySc[Rƥ58×å̹ ĆDzÌǝʐǝŹǜłȇpp. 395-396 (2007)

(2010年 9 月28日提出)

(2010年10月15日受理)

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