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；
Thecircular cross section turns into ellipse as the ratcheting strain accumulates.
随着棘轮应变的产生，直管圆截面变为椭圆截面。
The strain was gram negative, ellipse cell, no spores and no flagellum.
菌株细胞呈椭球形，革兰氏阴性，不产芽孢，无鞭毛。
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