This and the next slide are both from:
Andrzej Teter (Dept. of Applied Mechanics, Technical University of Lublin, Poland), “Application of different dynamic stability criteria in case of columns with intermediate stiffeners”, Mechanics and Mechanical Engineering, Vol. 14, No. 2, pp 339-349, 2010
ABSTRACT: In this paper, the dynamic responses of the open cross section columns with intermediate stiffeners subjected to in–plane pulse loading of a rectangular shape were concerned. Columns made of isotropic material were assumed to be simply supported at both loaded ends. The problem of the interactive buckling was solved by finite element method (FEM) – ANSYS 9. The critical dynamic load factors DLF has been determined using the most popular Budiansky–Hutchinson’s criterion and they have been verified with author’s versions of the phase portraits criterion.
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