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对Φ 73mm× 5.51mmNU N80油管采用了三种外径接箍进行有限元计算与滑脱强度试验，分析了接箍外径缩小后对连接强度的影响以及失效形式。
Three kinds of outer diameter couplings were used for the calculation of the Φ73mm × 5.51mmNU N80 tubing and the test of the strength of the coupling was carried out. The influence of the coupling diameter on the connection strength and the failure mode were analyzed.