【摘要】 在π平面上,取Mises屈服轨迹覆盖面积与其相交十二边形覆盖面积相等的方法确定十二边形6个顶点,顶点与内接点连线为新的屈服轨迹,建立该轨迹在HaighWestergaard应力空间上的直线方程,证明了此方程确定的屈服准则为Mises屈服准则的最大程度的线性逼近,其偏差应力矢量模长与Mises准则模长在π平面上平均误差为零;给出了十二边形内接点顶角为159 836°,圆外顶角为140 164°;以及单位体积塑性功率表达式·更多还原

【Abstract】 Let the area covered by Mises yield locus on the π-plane be equal to the area coverage of a non-equiangular but equilateral dodecagon and the two areas be overlapping to determine the six apexes of the new yield locus. Then, the lines connecting these apexes and six inscribed points are defined as the new yield criterion loci or locus as a whole. The linear equation of the new locus in Haigh Westergaard stress space has been deduced. It is proved that the new yield locus is approximate upmost to that of Mises yield criterion and is called MA (most adjacent) yield criterion for short, and the apex angle of the new dodecagon is 159.836° with the apex angle of circumscribed hexagon equal to 140.164°. The mean error of deviator stress vector modulus on the π-plane between Mises and MA criterions is zero. Furthermore, the plastic power rate for unit volume is also given.更多还原