유한요소 극한해석을 이용한 가공경화재료의 튜브압출공정 해석

Abstract

The paper analyzes the tube extrusion process for work hardening materials by finite element limit analysis. Although limit analysis studies the asymptotic behavior of elastic-plastic materials, its concept can be extended to a class of work hardening materials. Finite element limit analysis based on a variational principle of duality consists of a limit formulation, finite dimensional approximation, and a minimization technique. Since the finite element limit analysis guarantees stable convergence and computational efficiency, it is suitable to a class of nonlinear solid mechanics problem such as metal forming processes. Especially, the tube extrusion process for work hardening materials is simulated by the present algorithm as a demonstration of its validity and versatility.