Treatment of discontinuous interface in liquid-solid forming with extended finite element method
(1. School of Mechatronic Engineering, Northwestern Polytechnical University, Xi’an, 710072, China
2. Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Ministry of Education, Xi’an 710072, China)
2. Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Ministry of Education, Xi’an 710072, China)
Abstract: Extended finite element method (XFEM) is proposed to simulate the discontinuous interface in the liquid-solid forming process. The discontinuous interface is an important phenomenon happening in the liquid-solid forming processes and it is difficult to be simulated accurately with conventional finite element method (CFEM) because it involves solid phase and liquid phase simultaneously. XFEM is becoming more and more popular with the need of solving the discontinuous problem happening in engineering field. The implementation method of XFEM is proposed on Abaqus code by using UEL(user element) with the flowchart. The key is to modify the element stiffness in the proposed method by using UEL on the platform of Abaqus code. In contrast to XFEM used in the simulation of solidification, the geometrical and physical properties of elements were modified at the same time in our method that is beneficial to getting smooth interface transition and precise analysis results. The analysis is simplified significantly with XFEM.
Key words: extended finite element method; solid metal with liquid phase; numerical simulation