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本文用塑性方法和薄壳弹塑性稳定理论,导出了在轴力和外力共同作用下,套管弹塑性失稳的临界外压计算公式,并得到了临界外压与应力比关系曲线和临界外压与轴力关系曲线。对轴向拉力和压力对临界外压的不同影响也进行了讨论。
In this paper, by using the plastic method and the elasto-plastic stability theory of thin shell, the critical external pressure calculation formula of elasto-plastic instability of casing under the combined action of axial force and external force is deduced. The critical pressure and stress ratio curve and critical Pressure and axial force curve. The different effects of axial tension and pressure on the critical external pressure are also discussed.