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本篇主要探讨双轴应力设计套管柱的方法问题,建立求段长公式[ΔH]=(V+u-(F(P_2/m)~2-3u~2)~(1/2))/F,确定套管可下深度。本文认为第四强度理论的实质是用能量原理把多元应力一元化。因此物体在复杂应力状态下,其安全系数也应为一元。套管在拉挤二向应力下的安全系数为:m=[A_2+AB+B~2)-1/2,由此形成强度条件。以上两式应互相印证。一元论是贯穿本文全篇的基本思想。套管柱设计至今没有一套成熟的公式和方法,许多人在不断地探索,以求得合理的套管设计公式和计算方法,本文主要就套管柱在拉挤状态下的设计公式和方法作一初步探讨。
In this paper, we mainly discuss the method of biaxial stress design of casing string, and establish the equation of length [ΔH] = (V + u- (F (P 2 / m) ~ 2-3u ~ 2) / F, to determine the depth of the casing can be. This paper argues that the essence of the fourth strength theory is the unification of multiple stresses by the principle of energy. Therefore, the object in complex stress state, the safety factor should also be a dollar. The safety factor of the casing under pultruded bidirectional stress is: m = [A_2 + AB + B ~ 2) -1/2, thereby forming the strength condition. The above two types should confirm each other. Monism is the basic idea throughout this essay. There is no set formula and method of casing string design so far. Many people are constantly exploring to get a reasonable casing design formula and calculation method. In this paper, the design formulas and methods of casing string in pultrusion are mainly studied. Make a preliminary discussion.