cylindrical shell, aggregate, stability, plastic deformation, experiment.

The influence of geometric parameters and loose filler on the form of loss of stability of thin-walled cylindrical shells and the critical value of the transverse load during bending are studied experimentally. The test samples are made of aluminum alloys. One end of the shell is rigidly fixed, and the other end is applied vertically directed force. Empty and filled to 90 % by volume bulk shell material were investigated. As an aggregate, iron powder PZh-5 was used. In each series of experiments, 5-10 samples were tested. After the statistical processing of the experimental data, graphs of the dependence of the displacements of the loaded end of the shell on the applied force are plotted. The critical load was determined by the inflection point method, according to which the load is considered critical if its subsequent small increment leads to a sharp increase in the deflection of the shell. It is established that the filling of bulk material with 90 % creates, under the bending of the shell, pressure on its internal surface, which prevents the formation of local dents and increases the value of the critical load. The experimental values of the critical bending moment for empty shells are compared with the results of an analytical solution of other authors, which does not take into account the effect of length on the stability of the shell. It is shown that the analytical solution in this case gives an overestimated value of the bending moment. The discrepancy between the results of calculations and experiments on this parameter can reach 80 %. The refinement of the theoretical results requires the solution of the problem in three-dimensional, geometrically and physically nonlinear formulation involving numerical methods and implementing program complexes.

Petrov Mikhail Vasilyevich

e-mail: rimmapetrova20@gmail.com,  Dr.  Sci.  Tech.,  Professor,  I.N.  Ulyanov  Chuvash  State University, Cheboksary, Russia.

Fedorova Tatyana Georgievna

e-mail: tanusha2884@mail.ru, Ph.D., Senior lecturer, I.N. Ulyanov Chuvash State University, Cheboksary,  Russia.

Gonik Ekaterina Grigoryevna

e-mail: katya.gonik@mail.ru,   Senior   Lecturer,   I.N.   Ulyanov   Chuvash   State   University, Cheboksary,  Russia.

Pfanenshtil Nadezhda Georgievna

e-mail: nfedorova83@mail.ru, Ph.D., , Assoc. Prof., Kazan Branch of the Russian State University of Justice, Kazan, Russia.