Determination critical stresses of buckling on basis of stresses and geometrical parameters analyses
This paper suggests the method for evaluating critical stresses of instability in case of complicated deformation based on probability forecast. It is shown that in case of lateral buckling the stress condition is evaluated on criterion of rigidity, and the latter is applied for stability calculations. This is possible because of obtained relation between the probable instability condition and critical stresses, in form of stress invariants. Analytical research is based on experiments, testing simply supported steel girds of small thickness and big height subjected to bending force on free end.