【摘要】 结合理论分析、有限元模拟和试验验证，系统地对12Cr2Mo1管板与321不锈钢管子组成的换热器管板胀接接头在不同温度载荷下的残余接触压力和拉脱性能进行了研究。利用叠加原理建立了胀接接头在高温下残余接触压力的数学模型，得到了胀接接头残余接触压力分布规律以及在不同环境温度下残余接触压力和拉脱力随温度的变化关系。模拟和试验结果表明，高温下胀接接头的残余接触应力明显高于常温，且下端的残余接触应力高于上端；拉脱强度随着温度的升高而增大；高温下残余接触压力会由常温下的2条高压力接触环带变为3条高压力接触环带，提高了接头的结构强度。更多还原

【Abstract】 The residual contact stress and pull-off performance of the expansion joint of heat exchanger consisting of 12 Cr2 Mo1 tubesheets and 321 stainless steel tubes under different service temperature were studied systematically in combination with the theoretical analysis, finite element simulation and test verification.The mathematical model of residual contact pressure of expansion joint at high temperature was established by superposition principle.The distribution law of residual contact pressure and the relationship between residual contact pressure and pull-off force under different ambient temperature were obtained.The results of simulation and test show that the residual contact stress of the expansion joint at high temperature is higher than that at normal temperature and that of the lower end is higher than the upper end; The residual contact pressure at high temperature will change from two high pressure contact rings at room temperature to three high pressure contact rings, which improves the structural strength of the joint.更多还原