Abstract
Sub-modeling techniques implemented in commercial finite element codes were reviewed. New sub-modeling applications in structural mechanics stress analysis are presented. Sub-modeling methods based on displacement and force cut boundary application are compared. Advantages and disadvantages of these methods are discussed. The case of nested sub-models is demonstrated.
Highlights
Initial discussion on displacement and force based sub-modeling techniques was presented in the conference Mechanika 2014 [1]
This paper extends the conference discussion adding case study of the nested sub-modeling approach for the maximum stress analysis in the weld toe of the surge vessel
For the case of interest, the global model of surge tank has a complicated structure (Fig. 12) and a finite element stress analysis of the entire tank cannot be done with the needed accuracy
Summary
Initial discussion on displacement and force based sub-modeling techniques was presented in the conference Mechanika 2014 [1]. The second model (sub-model) contains a much close approximation of these regions, e.g. stress concentration region, but excludes the major part of the first model where results calculated by a coarse meshed model had acceptable accuracy It could be presented as a relatively small refined part (submodel) cut out from the global model. The sub-model with the force based cut boundary conditions cannot be used for calculation of global displacements. Nodal-driven results of displacements, rotations, temperature, pore pressure and acoustic pressure are interpolated from the global model onto the cut boundary nodes of the sub-model in “Node-based submodeling”. ANSYS sub-modeling procedures map degree-of-freedom results (displacements) and body force loads (mainly temperatures for a structural analysis) from the coarse model to the cut boundaries of the submodel [20].
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