在双向应力状态下，沿正应变方向更易磁化。
Under biaxial stress state, magnetization is more easily achieved along the direction of positive strain.
双面应力：应力存在于构件中一个平面内的不同方向上，也称双向应力。
Both-faces stress: The stress exists in different directions in one plane of the component is called Both-faces stress which is also called double-faces stress.
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。
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。
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.
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