선상 가열 변형의 신속 예측을 위한 고유변형률 및 열변형률 기반 해석 방법과 FEM 정확성 비교

초록

In order to predict the response of plates under the influence of line heating and avoid having to do expensive and time consuming experiments, the thermal elastic-plastic analysis by utilizing finite element method for predicting plate deformations is performed with various software. But however, due to transient 3D solid elements analysis, has a large amount of computational data so that it will cost much time to get an accurate result. So, recently, man methods for rapid prediction of plate deformations have been presented. Such as the elastic analysis by using equivalent loads method based on inherent strain, and the elastic-plastic analysis which can represent the influence of addition loads by using SDB method. And because of water cooling in actual factory production, the final phase transformed crystal structures in the steel plate are different from original phase which also makes material properties different in heating and cooling. Meanwhile, martensite volume expansion has been occurred and influences magnitude of inherent strain and thermal strain throughout process. In this paper, the equivalent loads method and SDB method considered phase transformation by using heat transfer analysis to obtain inherent strain region were presented. The above two methods by using 2D shell elements static analysis can save much time and compared with FEM that a good agreement of three methods for predicting plate deformations during different analysis process were obtained.