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本篇在评价API套管抗挤强度公式[Pc=[2(D/t-1)/(D/t)~2])Y_p]——(A)的基础上建立新的套管抗挤公式[Pc=Y_p/2ln(D/t/(D/t-2))]。(A)式源出于弹性力学拉梅(lame)问题的解。这个解的推导和结论都是难予置信的。若把(A)式作为一个独立的公式来衡量,它同样是不合理的。问题的要害是超存在。本文所给出的抗挤公式由两种方法证为同一,而后又为自然法则、强度理论所验证。篇末验证中附有例算,从而讲一步确立了上篇的近似公式(Ⅲ)
This article in the evaluation API casing extrusion strength formula [Pc = [2 (D / t-1) / (D / t) ~ 2]) Y_p] - (A) based on the establishment of a new anti-extrusion casing The formula [Pc = Y_p / 2ln (D / t / (D / t-2))]. The source of (A) is derived from the solution of the lame problem of elasticity. The derivation and conclusion of this solution are unbelievable. It is also unreasonable to weigh (A) as an independent formula. The crux of the problem is super existence. The anti-extrusion formula given in this paper is proved to be the same by two methods, and then verified by the laws of nature and strength. At the end of verification, there is an example calculation, so as to establish the approximate formula of the previous paragraph (Ⅲ)