Analysis of Residual Stress of Austenitic Stainless Steel Heat Exchange Tube Expansion
A reliable connection between the heat exchange tube and the tube sheet is an essential guarantee for the safe operation of the heat exchanger.A computational simulation was conducted to assess the internal pressure loading process of a 304 stainless steel heat exchange tube and a 16Mn tube sheet.The residual stress of an expansion joint with strength expansion and expansion was then compared.The results of the research demonstrate that when the internal pressure of the expansion joint is less than 30 MPa,both the strength welding plus strength expansion structure and the strength welding plus expansion structure are within the elastic deformation range.Furthermore,no residual stress is observed after the internal pressure is unloaded.When the internal pressure of the expansion joint is between 30 and 40 MPa,the residual stress increases rapidly,reaching a peak,and then the growth rate slows down.When the internal pressure of the expansion joint is between 30 and 175 MPa,the residual stresses of the two structures are comparable.When the internal pressure exceeds 175 MPa,the residual stress difference between the two structures becomes increasingly apparent,with the residual stress of the slotted structure exhibiting a significantly higher value than that of the non-slotted structure.Following the loading of the expansion pressure to 100 MPa and subsequent unloading to 0 MPa,no discernible difference in the residual stress distribution is observed between the two structures,and the slotting has no effect on the residual stress.
万方数据
维普
