LINEAR AND NONLINEAR BUCKLING AND POST BUCKLING ANALYSIS OF A BAR WITH THE INFLUENCE OF IMPERFECTIONS

作者：Novoselac Stipica^*; Ergic Todor; Balicevic Pavo

来源：Tehnicki Vjesnik, 2012, 19(3): 695-701.

• influences of imperfections
• linear buckling
• nonlinear buckling
• numerical analysis
• post buckling

This paper presents a linear and nonlinear buckling and post buckling numerical analysis of a bar with the influence of imperfections. In the first step, we used an approach of analytic and numerical linear buckling analysis of a bar with linear-elastic material. After linear buckling analysis of the bar, we performed nonlinear buckling analysis with the Riks method. Since the nonlinear analysis was performed in the case of ideal loading, to get correct and more realistic information of post buckling response, imperfections and plastification of material must be considered. In this case, the imperfections are eccentrical loads. This paper finally shows that the post buckling behaviour becomes unstable even for a very small value of eccentrical load in nonlinear analysis with elasto-plastic behaviour of material. Numerical analysis was performed in software Abaqus 6.10.

• 出版日期2012-9