Buckling Simulation And Experiment Study On Spherical Heads With A Pad Flange Of The Vacuum Helical Ribbon Dryer

A spherical head with a pad flange is used on the vacuum helical ribbon dryer. The axial forces brought by transmission is applied to the pad flange. In the current status, we simply calculate this head with a pad flange as spherical shell. However, there are many differences between spherical head with a pad flange and spherical shell suffered by external pressure. So, the current engineering computation method is deserved to be further study. In this paper, experimental studied and numerical simulation analyzed is used on the buckling of spherical head with a pad flange and we hope to provide references for design of such structure.In this paper, the method of combining simulation and experiment is used to study. Physical samples were made by scaling the spherical head with a pad flange, and by scanning samples using laser scanner we obtained the initial geometric shapes. Then geometric shapes were extracted to build geometric model and using ABAQUS software to simulate. Meanwhile, reading the maximum geometric deviation value and using the consistent imperfect buckling mode method to build geometric model and using ABAQUS software to simulate again. The comparing between simulation and experimental results showed that the critical pressure and the mode obtained by scanning model and experiment are basically the same. The dates obtained by the consistent imperfect buckling mode have big difference with experimental results, especially the mode.Axial forces were applied to the scanning model and using simulation analysis. The results show that the drop of critical pressure is just 1.69% when the radius of spherical shell is 350 mm, the thickness is 1.93 mm, the radius of parallel circle is 210 mm and the axial force on the sample is 1000 N, which has a little effect.In the current status, this structure is simply calculated as spherical shell. Experimental value and value of the standard GB150 ratio is about 2.3. So, the design of current engineering computation method has certain safety margin.