Comparison of LOGOS and ABAQUS: solutions for post-buckling deformation of a cylindrical shell under axial compression


Аuthors

Obolenskiy M. V.1*, Voronkov O. V.1**, Andropenkov S. S.1***, Kurikov N. N.2****

1. Systems of Engineering Analysis Ltd., Nizhny Novgorod, Russia
2. Atomenergoproekt JSC, Saint-Petersburg, Russia

*e-mail: m.obolenskiy@caecis.com
**e-mail: fsi@caecis.com
***e-mail: s.andropenkov@caecis.com
****e-mail: nnkurikov@spbaep.ru

Abstract

Cross-validation results for LOGOS Russian-made commercial CAE software are provided in the article. Dynamic buckling and post-buckling elastic-plastic deformation of straight thinwalled aluminum round pipe under axial compression is considered for the purpose. Set-up for the case is based on descriptions of an experiment from literature. LOGOS simulation results are compared to the corresponding ABAQUS results and to the experimental results.
An assembly consisting of top and bottom steel mandrels and the pipe between them is considered. The top mandrel is welded to a steel rod, which is placed inside the mandrels and the pipe and serves for centering of the assembly and as a sliding guide. The bottom mandrel is fixed on a massive basement. The mandrels and the rod are considered as massive rigid bodies relative to the pipe. Impactor falling from a certain height along axis of the pipe on the top mandrel is loading the assembly. Behavior of the assembly during the event is simulated using finite element method (FEM) and explicit time integration scheme. Initial small imperfection of the pipe shape producing a significant influence on the final pipe deformed shape is considered in the simulation as an additional aspect.
Good qualitative correspondence of the obtained simulation results to the experimental results is stated. Quantitative comparison is not done because of strong probabilistic nature of the pipe behavior based on real size and shape of its initial small imperfections. LOGOS and ABAQUS simulation results for the majority of the considered values differ less than 1%, maximum 4%. LOGOS calculation effort is nearly 27 times larger compared to ABAQUS. The provided information confirms that LOGOS software can be successfully used for solution of engineering problems analog to the considered case. LOGOS being under intensive development has a significant potential in a field of calculation efficiency. The case can be used for testing of the software new versions.

Keywords:

FEM, impact loading, contact, post-buckling elastic-plastic deformation, ABAQUS, LOGOS

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