为了研究油套管螺纹接头不同密封结构参数与密封面粘扣的关系,以Φ346.08 mm×15.88 mm P110套管特殊螺纹接头为例,设计了不同的密封面参数,并进行实物上、卸扣试验,通过试验分析提出可以用摩擦功这一量化指标来表征密封面抗粘扣性...为了研究油套管螺纹接头不同密封结构参数与密封面粘扣的关系,以Φ346.08 mm×15.88 mm P110套管特殊螺纹接头为例,设计了不同的密封面参数,并进行实物上、卸扣试验,通过试验分析提出可以用摩擦功这一量化指标来表征密封面抗粘扣性能。研究表明,当摩擦功小于387 kJ时,粘扣风险较低;密封结构不匹配会导致密封面接触发生“犁削效果”,即使摩擦功很小也会发生粘扣,属于非正常摩擦磨损。展开更多
为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料...为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料屈服值,接头的整体应力水平分布较合理;上扣曲线特性较好,在ISO 13679:2002 CAL IV复合加载下,特殊螺纹接头密封面均保持较大接触压力和密封长度,密封指数值大于理论临界值,表明其具有良好的密封性能;通过全尺寸复合加载实物试验以及极限试验,验证了该接头满足ISO 13679:2002 CALⅣ应用等级评价标准,具有优异的密封性能,其拉伸效率、压缩效率、内压效率、外压效率均达到管体100%。展开更多
Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing param...Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting.展开更多
文摘为了研究油套管螺纹接头不同密封结构参数与密封面粘扣的关系,以Φ346.08 mm×15.88 mm P110套管特殊螺纹接头为例,设计了不同的密封面参数,并进行实物上、卸扣试验,通过试验分析提出可以用摩擦功这一量化指标来表征密封面抗粘扣性能。研究表明,当摩擦功小于387 kJ时,粘扣风险较低;密封结构不匹配会导致密封面接触发生“犁削效果”,即使摩擦功很小也会发生粘扣,属于非正常摩擦磨损。
文摘为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料屈服值,接头的整体应力水平分布较合理;上扣曲线特性较好,在ISO 13679:2002 CAL IV复合加载下,特殊螺纹接头密封面均保持较大接触压力和密封长度,密封指数值大于理论临界值,表明其具有良好的密封性能;通过全尺寸复合加载实物试验以及极限试验,验证了该接头满足ISO 13679:2002 CALⅣ应用等级评价标准,具有优异的密封性能,其拉伸效率、压缩效率、内压效率、外压效率均达到管体100%。
基金Funded by the State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body(No.31815008)the National Natural Science Foundation of China(No.U1564202,NO.51205298)111 Project(No.B17034)
文摘Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting.
