The Bilateral Stress Elliptic(ellipse of plasticity) Theory is widely used in casing strength designing, as an approximate alternative to the four th strength theory.
作为第四强度理论的近似计算，目前在套管柱强度设计中广泛应用双向应力椭圆理论。
Based on this kind of crack element, and by introducing parametric equation of ellipse, a new method for estimating stress intensity factor is proposed.
基于这种裂纹单元，作者引入椭圆参数方程，推出一种计算裂纹前缘点应力强度因子的新方法。
It is reasonable takes shape the unfinished piping to the flat ellipse for reduce the remaining stress peak value and ellipticity.
从控制成型残余应力峰值和合缝预焊后管口椭圆度的角度出发综合考虑，将管坯成型为扁椭圆较为合理。
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；
According to results of tests and calculations, it is shown that the stress concentration coefficient of elastic corner is less about 15% than the ellipse arc corner.
试验和计算的结果表明：弹性角隅的应力集中系数比椭圆弧角隅降低15%左右。
According to results of tests and calculations, it is shown that the stress concentration coefficient of elastic corner is less about 15% than the ellipse arc corner.
试验和计算的结果表明：弹性角隅的应力集中系数比椭圆弧角隅降低15%左右。
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