It manly analyzes four kinds transmutations of piston effect, temperature effect, expansion effect, helical buckling effect in the system of tubing and packer.
针对油管柱—封隔器系统的活塞、螺弯、温度、鼓胀等四种基本效应进行分析，同时根据现场工艺特点进行了温度场和压力场的研究。
Under different Angle lean-state, the initial drawback makes a marked effect on buckling bearing capacity of piston.
活塞在不同倾斜度下，初始缺陷对活塞屈曲承载力的影响较大。
The effect of in-plane bending deformation on the lateral_torsional buckling of beam_columns is considered and the effect form, the additional moment factor, is obtained.
得出了平面内弯曲变形对压弯构件弯扭屈曲的影响形式，这一形式可用统一的弯矩附加系数表达。
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