Safety coefficients for products made of composite materials using the example of a compressed cylindrical shell

The main objective of this study is to obtain a method of calculation safety coefficients for composite materials products in order to compensate for the actual variations in the mechanical characteristics of composite materials as a result of the existing manufacturing technologies used, which will ensure high reliability of composite materials structures used in space technology and other industries. The study was conducted on theoretical parametric mathematical models, using the mathematical apparatus of probability theories and statistics, using the developed step-by-step methodology. The practical applicability of the developed method is confirmed by the example of the analysis compressed cylindrical shell. The result of the study is a developed calculation method based on the limit state, which allows to evaluate the accuracy of the theoretical solutions used, determine the values of safety coefficients and design a minimum mass structure. This work was performed by a team of authors, in which Yu. P. Pokhabov built a failure model according to the “load- resistance” scheme. Nagovitsin V. N. justified the choice of parameters for calculating cylindrical shells made of composite materials. Ivanov E. A. conducted an analysis of compressed cylindrical shells made of carbon fiber that confirmed the practical applicability of the method. Pokhabov A. Yu. proposed a method of calculation based on the limit state, which allows to design a minimum mass structure.