The strength calculation of ring-stiffened cylindrical shell of oval cross section under uniformly-distributed externalpressure is a complicated problem in mechanics.
均布外压下带肋椭元柱壳的强度计算是一个比较复杂的力学课题。
2
And use the fourth strength theory, the axial tension in the coiled tubing under the influence of internal and externalpressure from a comprehensive stress of checking.
并利用第四强度理论，对连续油管在轴向拉力与内外压力的作用下的综合应力进行了校核。
3
Mechanical characteristic of ct is studied. The model of bending, internal pressurestrength and external collapse strength, diametric growth and stuck-point of ct is established.