Inside Overpressure Utilization for a Stability Increasing at the Thin-Walled Rotational Symmetrical Shell Strained by Axial Force

Abstract

The members, strained by axial force, are used in the different areas of human activities. If members have a big slenderness, it can to origin a problem with losing of their stability. One of the possibilities, how can be partially eliminated this deficiency with not extending its parameters and of course its mass, is adding of force effects, which will be operate against to force effects making of stability losing. The article deals with theoretical possibility of stability increasing by adding of inside overpressure. It describes allocation and interaction of effected stresses according to the appropriate formulas and solves concrete sample. Last but not least, it shows graphical layout of effect stresses and satisfaction of stability condition with regard to different values of inside overpressure and geometrical parameters of members. The article brings a possible way of members stability increasing and in case of experimental verification we can predict favourable future of this.

Elementi, opterećeni aksijalnom silom, se koriste u raznim oblastima. Ako su savitljivi, mogu izgubiti svoju stabilnost. Jedna od mogućnosti za delimično otklanjanje ovog nedostatka, bez ojačavanja i povećanja mase, je dodavanje sile koja će delovati suprotno tako da uravnoteži opterećeni element. Ovaj rad obrađuje teorijsku mogućnost povećanja stabilnosti dodavanjem unutrašnjeg nadpritiska. Opisan je položaj i interakcija opterećenja odgovarajućim jednačinama i dobijeno rešenje konkretnog problema. Pokazan je i grafički prikaz dobijenog efekta i zadovoljenje uslova stabilnosti u odnosu na različite vrednosti unutrašnjeg nadpritiska i geometrijskih parametara elemenata. U radu je dat i poseban način povećanja stabilnosti elemenata i eksperimentalne verifikacije daljih postupaka.