Hello. I need the analytical formula or program code for ansys ( or something similar) or calculation method for calculating the strength ( fracture, destruction, collapse ) and vertical stability of thin-walled tubes ( thin-walled cylindrical shell) under uniform axial load (Figure 2, right) having weakening (holes,cut-outs) in the form of rectangular openings ( 2 or 4 pieces as shown in Figure 1 or Figure 2) and fixed to the ends , as shown in Figure 2, right. Thin-walled cold-worked aluminum tubes (mechanism of destruction ?) have diameter 35 mm, wall thickness 1 mm , length 1 m separation on the types of thin-walled tube and the cylindrical shell (depends on the ratio of the radius of the tube and wall thickness ). For example , the ratio of the shell varies in the range of 30 - 1000 . Therefore, the calculation can be carried out as the formulas for the calculation of the tubes and the formulas for the calculation of thin-walled cylindrical shells (in doubt , tell me how ) . Calculation must comply with the calculation of strength - vertical stability thin-walled pipe with the weakening in the form of rectangular cutouts ( large side cutout lies in a plane parallel to the end face of the pipe) on the surface of the tube with a uniform axial compression using the tensile strength (ultimate strength, breaking point) . If exceeded, the load should be structural failure (breakaways and sagging, fracture). For this type there are the analytical formulas of calculation only for the case of tube with transverse circular hole when calculating the tension of the tube. Is it possible to adapt these formulas for calculating the tube with rectangular holes in the cases of compression ?
Рисунок 3.jpgPicture 1.jpg