The spans of model parameter are analyzed in terms of reasonable shape of yield locus.
根据屈服面的几何形状，分析了模型参数的取值范围。
The precision of Cam clay model is poor and the Sekiguchi Otha model gives excess deformation and a singularity point on the yield locus.
采用关口—太田各向异性模型，实测资料表明预测的变形偏大，且屈服面上有奇异点。
The strain yield locus of the stress yield criterion was advanced and the strain ellipse method for calculating the limit bulging coefficient was given.
提出应力屈服条件的应变屈服轨迹，给出了复合胀形极限成形系数的解法；
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