This project demonstrates the drop test of a plastic bottle on the SimScale engineering simulation platform (https://www.simscale.com).
Find this simulation here, copy the project, and use the template for free: https://www.simscale.com/projects/ahmedhussain18/plastic_bottle_drop_test_2
This project not only shows the robustness of the SimScale platform for these types of complex cases but also shows the difference one can make in the results when doing the analysis using second order mesh rather than first order. The model was created on Onshape and was then easily imported to SimScale platform using new Import from Onshape plugin available under Mesh Creator.The geometry is shown in the figure below.
Two different meshes were used; first order mesh and second order mesh. The mesh was created using Tetrahedralization with local refinements on platform. The bottle was meshed with fairly refined mesh whereas the ground was made coarse.
Dynamic nonlinear analysis was performed. For the physical contact, “Augmented Lagrange” was used considering ground surface as master and bottle bottom outer ring as slave. The plastic bottle was given an elastoplastic ABS material. Than it was given an initial velocity of 6.26 m/s (~22.5 km/h) in negative z direction. The ground was constrained in all directions making it rigid. The simulation with first order elements was run for 0.0018 s and with second order was run for 0.002 s. The analysis took 45 min. for first order case and 280 min. for second order case.
First the comparison results are shown below between two mesh studies. While looking at the images below it is clear that the second order mesh (left) shows more realistic results compared to first order mesh (right). The second image shows the fully deformed bottom of the bottle. Comparing both clearly shows much better capturing of the deformation in case of second order mesh. This can be further seen in third figure, which is taken at the final step when the bottle has left the surface after impact.
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Post time: Jun-16-2017