| Popis: |
The classical analytical expression for critical compression stresses in the cylindrical shells in meridional direction σx,Rcr has been written by Lorenz, Timoshenko and Southwell at the beginning of XX century. During the natural experiments with those shells done later, it is obtained out that the stresses which cause the loss of stability are considerably different from those calculated by the analytical expression. In 1945 Koiter suggested that the primary reason for these differences are the imperfections in the shells. M. Tekleab attempted in her PhD thesis to determine the most unfavourable geometrical imperfection in the shells, pressured by their axis. Having encountered many incorrect results and conclusions in scientific publications, the author has decided to check the obtained conclusions. |
