摘要：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. Sub-modeling here assumes a finite element modeling technique employing two or more models of different geometry. The first model consists of a relatively coarse meshed geometry with possible significant errors of calculated results in some small regions. 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. Visually it could be presented as a relatively small refined part (submodel) cut out from the global model. The boundary conditions of the cut-out edges or surfaces are based on the results calculated by the global model.
关键词：sub-modeling; model reduction methods; finite element analysis; stress analysis
