STABILITY STUDY ON A LONG SHAFT USING DIFFERENT FINITE ELEMENT MODELS

摘要

Based on a vertical shaft with supporting structures,the stability study is carried on using different finite element models. To achieve this aim,the elastic-perfectly plastic yield criterion (Drucker-Prager yield criterion) is applied in all the five finite element models including the conventional 3D model,3D contact model,plane strain model,axisymmetric model and load-structure model. The initial gravity stress field is only considered. Hereafter,the stress and displacement situation is investigated. The results show that the stability of the shaft is pretty well and the shaft has a large amount of residual strength. The divergences of displacement and stresses between 2D and 3D analysis illustrate that the 2D model is irrational. The displacement calculated by the axisymmetric model is the greatest meanwhile the plane strain model obtains the minimum. The compressive strength evaluated by the conventional 3D and 3D contact model is larger than that by the load-structure model.