Buckling and stiffness analysis of a composite anisogrid conical shell with a fixed small base

Power elements of structures in the form of structural anisogrid shells of rotation are often used in the production of rocket and space technology. This is due, first of all, to high specific mechanical properties of composites, which allow to manufacture structures with a high degree of weight perfection. In addition, they are quite technological, as the method of continuous winding of composite fibers used in their production is widespread and well developed. In recent years, close attention has been paid to the design of composite mesh structures. An actual example of anisogrid cylindrical and conical shells is a spacecraft adapter for GLONASS satellites orbit launching, different variants of which are still produced in the workshops of Reshetnev JSC. The shells are of the same type, but differ in dimensions (diameters and lengths of cylindrical and conical parts) and bearing capacity. For composite elements of rocket-space technology it is characterized by the presence of a large list of variable parameters, the determination of the optimal combination of which every time results in a complex problem of scientific search. An algorithm and a program for building a finite element model of anisogrid conical shells made by continuous winding of composite fiber have been developed. The small base is fixed and the large base is reinforced by a spandrel and loaded by concentrated forces and moments. Numerical investigation of stability, stiffness and stress-strain state of the structure under varying parameters of its mesh structure formation is carried out with the help of FE model.