Abstrakt:
The article deals with the loss of stability of a cylindrical shell at dynamic transverse load. A
typical practical example of this kind of construction is a road tank welded to saddle
supports. All known domestic or foreign standards or recommendations for thin-walled shell
structures such as ČSN 690010 [1], EN 13445-3 [2], EN 1993-1-6 [3], AD-Merkblätt [4],
DIN 18800 [5], ASMECode [6], European recommendation ECCS 2008 [7] etc., provide the
solution of stability of thin-walled shell structures for static load only. However, the situation
of the traffic vehicles like road tanks is more complex because, in the vast majority of
cases, these are loaded dynamically. Within this article, computational FEM analysis of the
dynamically loaded cylindrical shell has been applied on a geometrically reduced model,
which will later be more suitable for experimental verification. The cylindrical shell is firmly
attached to the single saddle support through which both static and dynamic reaction
forces are transmitted. The saddle support embracing angle takes values 2 =
60°/90°/120° in accord with the demand of the standards and recommendations mentioned
above. At first, the loss of stability of the statically loaded cylindrical shell has been
analysed. Both geometric and material nonlinearities have been taken into consideration.
The geometric nonlinearity describes the loss of stability while material nonlinearity
describes the limit state of elastic-plastic carrying capacity. The resulting phenomenon is
a nonlinear stability snap-through of the saddle support into the cylindrical shell in the
elastic-plastic field due to the static load. At second, the dynamic analysis of the same
problem follows. The initial load velocity is selected in the range of 1 to 15 msec-1. The
upper limit of the initial velocity corresponds to the maximum possible piston speed of the
hydraulic pulsator installed at Education and Research Center in Transport (ERCT) of the
Faculty of Transport Engineering, University Pardubice. The hydraulic pulsator will be used for the planned experimental testing designed based on the analysis results presented in
this article. At the end of the article, the static and dynamic load capacities of the
computational model have been compared and then conclusions have been made based
on this outcome.