The IF Container assembly is shown in Figure 1. The 3D model provided to IDAC in Autodesk Inventor format consists of a Lid, Seal Plug, Quick Release Coupler, Top Section, Mid Section and a Base. ANSYS DesignModeler was used on the Inventor geometry for further defeaturing and preparation of an FE analysis. Earlier test had shown that the deformation and stresses in the region of interest, i.e. around the base, were highly symmetrical about the axis of the container. As a result, the smallest symmetric sector of 30-degree was used as the base geometry in the modeling.
For continuity of the structure, 3 representative weld geometries were also added to connect the Seal Plug to the Lid, the Top Section to the Mid Section, and the Mid Section to the Base. With the model finalized within ANSYS DesignModeler, it was then imported into ANSYS LS-DYNA for the transient dynamic analysis. All the parts/volumes within the container were 'glued' together so adjacent volumes shared common nodes at the boundaries and no bonded contact element was needed across the interfaces.
The 3D solids were meshed using 3D explicit solid elements within ANSYS LS-DYNA. Regular, sweepable volumes were meshed using predominantly hexahedral and wedge elements (8-noded SOLID164). Irregular volumes such as the Seal Plug and the Lid were meshed using tetrahedral elements as seen in Figure 2.