Calculation method of limit internal pressure of steel pipeline in good condition
A technology of limit internal pressure and calculation method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., to achieve the effect of easy reference and accurate results
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[0064] The unified strength criterion is developed on the basis of double shear elements and multiple slip mechanisms. It can be expressed in terms of principal stress as follows:
[0065]
[0066] where σ 1 , σ 2 and σ 3 is the principal stress, and σ 1 ≥σ 2 ≥σ 3 , α=σ t / σ c is the tensile-compression strength ratio of the material, where σ t and σ c are the uniaxial tensile and compressive strengths, respectively, and 0 where τ 0 is the shear strength of the material.
[0067] Equivalent Stress σ from Unified Strength Theory (USC) UE defined as:
[0068]
[0069] The unified strength criterion is composed of a series of piecewise linear strength criteria obtained with the change of b on the π plane. The specific expression form of the strength criterion for a certain material depends on the selection of the parameter b. According to the specific expression of b value, USC can be reduced to many current yield or strength criteria. For example, when α = 1 an...
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