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|Title:||Numerical Simulation of the One Meter Drop Test on a Bar for the Castor Cask - Preliminary Analysis|
|Authors:||JAKSIC NIKOLA; NILSSON KARL-FREDRIK|
|Other Identifiers:||EUR 22470 EN|
|Type:||EUR - Scientific and Technical Research Reports|
|Abstract:||The report presents the numerical analysis of two one meter drop tests of a single ductile cast iron cask on a steel bar. The cask comes from the CASTOR family with machined cooling fins in a region where impact occurs. In the first test, the impact is on the cask’s cooling fins whereas in the second test the impact is in an area where the ribs have been locally machined away. The numerical analysis is based on explicit dynamic analysis using the commercial finite element code ABAQUS extended with Python scripts to allow a parametric description of the problem. The analysis consists of two parts: a “blind-analysis” with assumed model parameters and a sensitivity analysis. The “blind-analysis” (basic model without any knowledge of test results) was performed for the two drop tests. The overall behavior of the model is qualitatively very similar to what was observed during the experiments. A longer impact duration, (between 3 ms to 5 ms) when the cask is dropped on the fins in comparison to the flat target, is observed in both the analysis and the test. The reaction force at the bar’s bottom surface from the model is qualitatively similar to that from the test. The peak force value is however overestimated by about 35%. On the contrary the measured strains inside the cask above the impact area are underestimated for the similar amount. Latter is mainly attributed to the fact that the lid wasn’t included in this version of the model. The maximum strain is about 20% higher for the flat impact area in both simulation and experiment. The sensitivity analysis was performed to study the influence of parameters which either cannot be or were not defined directly from the experimental data, such as the friction coefficient, or which are linked to the FE numerical procedures, like the bulk viscosity. Based on results, recommendations for an optimised set of parameters values are given.|
|JRC Institute:||Institute for Energy and Transport|
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