Al-Mg合金5083板の降伏曲面に及ぼす温度の影響

概要

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Warm press-forming of aluminum alloy sheets is quite attractive, since undesirable stretcher strain marks, which often appear on the surface of the sheets during cold press-forming, will disappear at high temperature, and furthermore, some aluminum alloys exhibit high-temperature superplasticity at a certain forming speed. In order determine the optimum condition of press-forming for an aluminum alloy sheet, in the present work, the effect of temperature on the yield locus was experimentally investigated. The yield locus of an aluminum alloy (5083-O) sheet was obtained by performing biaxial tensile tests, using cruciform specimens, at temperatures of 25, 100, 200, 250 and 300℃ at strain rate of 10^<-5>s^<-1>. From the tests, the effect of temperature on the yield locus was investigated. The size of yield locus drastically decreased with increasing temperatuere. Neither von Mises' criterion or Hill's can well predict the shape of the locus of this sheet metal. Instead of these quadratic yield functions, the yield criterion of Logan-Hosford a better choice for the accurate description of biaxial stress-strain responses at a high temperature.
弓削商船高等専門学校の論文
2003-02-28