ESTIMATION OF RESIDUAL CONTACT PRESSURE IN HYDRAULICALLY EXPANDED TUBE-TUBESHEET JOINTS OF HEAT EXCHANGERS
The connection of the tube to tubesheet is the most critical element of a tubular heat exchanger because its reliability depends on the integrity of many parallel tube-tubesheet joints. The process of hydraulic expansion of tube-tubesheet joints was simulated using finite element method, and the empirical equation based on data from calculations was developed to evaluate residual contact pressure of joints. In order to confirm the credibility of the empirical equation, some specimens were fabricated and joint strength experiments were performed using a MTS testing machine. The latter were found to be in good agreement with the estimated values. This work shows that material property and expansion pressure are the most important factors to determine residual contact pressure, the thickness of tube and the radial clearance between tube outer surface and tubesheet hole have the secondary effect. The thickness of tubesheet is the third important parameter for determining residual contact pressure in hydraulically expanded tube-tubesheet joints.
Haifeng Wang Zhifu Sang
College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China.
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）