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최강혁(Kanghyouk Choi),김주완(Juwan Kim),임세영(Seyoung Im) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Finite element analysis of welding processes, which entail phase evolution, heat transfer and deformation, is considered in this paper. Attention focuses on numerical implementation of the thermo-elastic-plastic constitutive equation proposed by Leblond et al in consideration of the transformation plasticity. Based upon the multiplicative decomposition of deformation gradient, hyperelastic formulation is employed for efficient numerical integration, and the algorithmic consistent moduli for elastic-plastic deformations including transformation plasticity are obtained in the closed form. The convergence behavior of the present implementation is demonstrated via a couple of numerical examples. Several locking phenomena removed by Solid-shell element.
최강혁(Kanghyouk Choi),김주완(Juwan Kim),임세영(Seyoung Im) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In the FE analysis of sheet metal forming, efficient results can be obtained by using shell elements rather than using solid elements. However, shell elements have some limitations to describe three-dimensional material laws. In the recent years, solid-shell element, which has only translational degree of freedom like solid element, has been presented. The assumed nature strain (ANS) and enhanced assumed strain (EAS) methods can be used to remove several solid-shell locking problems. In this paper, ANS method was used for diminish transverse shear locking and EAS method for thickness locking. Using the element, the steel pipe making process from flat plate analyzed effectively, which is including bending and welding.
Finite element analysis of arc-welding processes
Kanghyouk Choi(최강혁),Juwan Kim(김주완),Seyoung Im(임세영) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A finite element analysis of arc-welding processes is presented with emphasis on practical applications for vehicle or shipbuilding industry. We propose an implicit numerical implementation for Leblond’s transformation plasticity constitutive equations, which are widely used in steel-structure welding. Transformation plasticity is considered occurring in welding, and an efficient solid-shell finite element is employed for modeling thin plates under welding processes.
압연기 패스라인조절장치의 피로안정성과 치수제어능 향상을 위한 설계개선에 대한 분석
최강혁(Kanghyouk Choi),문창호(Chang Ho Moon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Passline of a rolling mill is the travel direction which a strip is processed through. It requires adjusting so that the coil can be properly processed. Passline adjustment revise the change of passline due to the wear of work and backup rolls. We verified the fatigue stability and stiffness of the passline adjustment under the misaligned mill load as well as normal loading condition. Several design parameters are analyised to decrease the stress concentration and make safe even if a misaligned loading is applied.
임세영(Seyoung Im),최강혁(Kanghyouk Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this paper, a finite element analysis of arc-welding processes is presented for large structures. We use an implicit numerical implementation for Leblond’s transformation plasticity constitutive equations, which are widely used in steel-structure welding. Several numerical examples, particularly including a large structure undergoing significant elastic-plastic deformations before welding, are presented to demonstrate the effectiveness of the three-dimensional analysis of welding processes.
ABAQUS USER SUBROUTINE을 이용한 용접공정의 유한요소해석
장현칠(Hyun-chil Chang),최강혁(Kanghyouk Choi),박종연(Jong Youn Park),임세영(Seyoung Im) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
We consider simulation of welding processes which involve typical thermometallurgical-mechanical phenomena. The welding constitutive equation by Leblond is implemented into the commercial code ABAQUS, employing UMAT and UMATHT, which are user subroutines available in ABAQUS. The main features of this coding include the consideration of the so called transformation plasticity, and the hyperelastic formulation for the stress recovery for elastic-plastic processes. Several examples demonstrates the effectiveness of the present approach.
용접공정에서 발생하는 변태 소성 구성방정식의 수치적 구현에 관한 연구
김주완(Juwan Kim),임세영(Seyoung Im),김현규(Hyun-Gyu Kim),최강혁(Kanghyouk Choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Finite element analysis of welding processes, which entail phase evolution, heat transfer and deformations,<br/> is considered in this paper. Attention focuses on numerical implementation of the thermo-elastic-plastic<br/> constitutive equation proposed by Leblond in consideration of the transformation plasticity. Based upon the<br/> multiplicative decomposition of deformation gradient, hyperelastic formulation is employed for efficient<br/> numerical integration, and the algorithmic consistent moduli for elastic-plastic deformations including<br/> transformation plasticity are obtained in the closed form. The convergence behavior of the present<br/> implementation is demonstrated via a couple of numerical examples.