Consider the surrounding tube sheet holes Expanding the impact of tubes and tube sheet material strain hardening properties

Within the slotted tube sheet heat exchanger Hydraulic Expansion joint structure as the research object, the establishment of the hydraulic expansion joints dimensional finite element model to simulate the process of Hydraulic Expansion. The model  Stainless steel needle valves  tube sheet holes Expanding impact tubes and tube sheet material strain hardening properties, tubes protruding ends of the tube sheet end effects.  Instrument manifolds  residual joints pull-off strength index for the evaluation, analysis of the tube sheet hole slot width, depth, location and number of the tightness of the joint and pull-off strength. Contact pressure of the joints, the distribution of the residual contact pressure, and the pressure change on the Expansion of the distribution trend. According to the conclusions of the study of the heat exchanger expansion joints for structural design parameters.