Influence by Thread Interference on Premium Connection Performance
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摘要: 运用ABAQUS软件计算了在上扣、上扣+拉伸条件下Φ139.70 mm×9.17 mm规格P110钢级特殊螺纹不同螺纹过盈量对接头性能的影响。模拟结果表明：上扣后，当螺纹过盈量∧0.159 0 mm时，密封面处接触压力变化不大；当螺纹过盈量∧0.238 5 mm时，随着螺纹过盈量的增加，密封面接触压力下降明显。上扣+拉伸条件下，随着螺纹过盈量的增加，密封面接触压力下降，同时接触位置向台肩处移动；当螺纹过盈量∧0.079 5 mm时，拉伸失效断裂在螺纹处；当螺纹过盈量∧0.159 0 mm时，拉伸失效断裂在管体。Abstract: Analyzed is the influence by different interferences of the Φ139.70 mm×9.17 mm P110 premium thread on the connection performance by means of the ABAQUS software，and under conditions of make-up，and make-up plus tensile loading. Result from the simulation reveals that if，after make-up，the thread interference is more than 0.159 0 mm，the contact pressure on the sealing surface changes a little；if the thread interference is more than 0.238 5 mm，along with increase of the interference，the contact pressure of the sealing surface is going down remarkably；under the condition of make-up plus tensile loading，along with increase of the interference，the contact pressure of the sealing surface is decreased，while the contact position is shifted towards the shoulder；and when the interference is more than 0.079 5 mm，tensile failure fracture takes places at the thread section，while when the interference is more than 0.159 0 mm，the similar fracture takes places with pipe body.
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