Design of a composite anisogrid cylindrical shell

Shells of rotation made of composite materials are often used as force elements of structures in the production of rocket and space technology. Composite shells have a high degree of weight perfection provided by high specific mechanical characteristics of composites. They are manufactured by the method of continuous winding of composite fibers on a mandrel of the required shape. The method is widespread due to its manufacturability and guarantees reliable provision of design parameters of the shells. Anisogrid cylindrical and conical shells in recent years have also started to be used in RCT. For example, at Reshetnev JSC, this type of shells are used in the designs of adapters intended for launching spacecraft and satellites into orbit. Adapter structural elements are similar, but differing in purpose, dimensions and bearing capacity, they have a unique combination of a large number of design parameters, the exact determination of which every time results in a complex scientific task. The solution to this problem involves numerous design calculations of the stress-strain state, critical loads and stiffness parameters. For this purpose, a digital twin is formed on the basis of a finite element model of anisogrid shells of rotation, manufactured by continuous winding of composite fiber, with the help of which the solution of the optimal design problem is performed in interactive mode. An algorithm and a program for constructing a composite anisohydric cylindrical shell with concentrated mass on one base and with a rigidly fixed second base are developed. Numerical analysis of stability, stiffness and stress-strain state of the structure under different variants of inertial action and at variation of parameters of its mesh structure formation is carried out with the help of FEM.