Pullout force study of tube-to-tubesheet joints in heat exchangers

DUAN ChengHong;QIAN CaiFu

Journal of Beijing University of Chemical Technology ›› 2007, Vol. 34 ›› Issue (3) : 308-312.

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Journal of Beijing University of Chemical Technology ›› 2007, Vol. 34 ›› Issue (3) : 308-312.
机电工程与信息科学

Pullout force study of tube-to-tubesheet joints in heat exchangers

  • DUAN ChengHong;QIAN CaiFu
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Abstract

The pullout forces and failure forms of hydraulically expanded, welded, and expanded-and-welded (including expanding prior to welding and welding prior to expansion) tube-to-tubesheet joints in heat exchangers have been experimentally and numerically studied. Geometrical, material and contact nonlinearities, as well as coupling of heat and structure in the finite element analysis were considered in order to simulate the elasto-plastic and thermoplastic behaviors of the joint materials and the influence of the welding heat on the expanded connections. The results show that the pull-out force of the welded joint is much larger than that of the hydraulically expanded joint and even slightly larger than that of the expanded-and-welded joint. There is no significant difference between the pull-out forces of the joint expanded prior to welding and that welded prior to expansion. Under tensile loadings, the failure of the expanded joint was found to involve the pull-off damage of the tube and tubesheet connection, while the failure of the welded joint involved mainly a shear break of the welding.

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DUAN ChengHong;QIAN CaiFu. Pullout force study of tube-to-tubesheet joints in heat exchangers[J]. Journal of Beijing University of Chemical Technology, 2007, 34(3): 308-312

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