KAIST · 공학
Sung-Kie Youn 교수의 연구실은 고정밀 유한요소 및 메쉬프리 해석 기법을 중심으로, 특히 이소지오메트릭 해석, T-spline 기반 유한요소법, 그리고 일阶 최소제곱법을 활용한 메쉬프리 방법을 개발하고 있습니다. 접촉 문제의 정확한 기하 모델링을 위해 모르타르 방법을 접목한 이소지오메트릭 접촉 해석 기법과, 유연한 국소 균일화가 가능한 T-스플라인 기반 쉘 유한요소 해법을 연구합니다. 또한 수치적 통합의 어려움을 줄이기 위한 체계적이고 안정적인 최소제곱 기반 메쉬프리 방법과 그에 기반한 오차 추정 및 적응형 메esh 재구성 기법을 개발하여 복잡한 물리적 문제에 대한 정확한 해석을 가능하게 합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
SUMMARY In the present work, an isogeometric contact analysis scheme using mortar method is proposed. Because the isogeometric analysis is employed for contact analysis, the geometric exactness of the contact region is maintained without any loss of geometric data because of geometry approximation. Thus, the proposed method can overcome underlying shortcomings that result from the geometric approximation of contact surfaces in the conventional finite element (FE)‐based contact analysis. For an i
Abstract A T‐spline surface is a nonuniform rational B‐spline (NURBS) surface with T‐junctions, and is defined by a control grid called T‐mesh. The T‐mesh is similar to a NURBS control mesh except that in a T‐mesh, a row or column of control points is allowed to terminate in the inner parametric space. This property of T‐splines makes local refinement possible. In the present study, shell formulation based on the T‐spline finite element method (FEM) is presented. Shell formulation based on NURBS
Abstract A new efficient meshfree method is presented in which the first‐order least‐squares method is employed instead of the Galerkin's method. In the meshfree methods based on the Galerkin formulation, the source of many difficulties is in the numerical integration. The current method, in this respect, has different characteristics and is expected to remove some of the integration‐related problems. It is demonstrated through numerical examples that the present formulation is highly robust to
