Dynamic Explicit Elastic-Plastic Finite Element Analysis of Large Auto-body Panel Stamping Process

J. Ocean Eng. Technol. 1998;12(1):10-22.

대형 차체판넬 스템핑공정에서의 동적 외연적 탄소성 유한요소해석

정동원,김귀식,양동열

제주대학교 기계공학과,제주대학교 기계공학과,한국과학기술원 기계공학과

Keywords: Dynamic Explicit, Elastic-plastic, Auto-body Panel Stamping, Sheet metal forming, Finite element method

핵심용어: 동적 외연적, 탄소성, 차체판넬 스템핑, 박판형성, 유한요소법

Abstract

In the present work the elastic-plastic FE formulations using dynamic explicit time integration schemes are used for numerical analysis of a large auto-body panel stamping processes. For analyses of more complex cases with larger and more refined meshes, the explicit method is more time effective than implicit method, and has no convergency problem and has the robust nature of contact and friction algorithms while implicit method is widely used because of excellent accuracy and reliability. The elastic-plastic scheme is more reliable and rigorous while the rigid-plastic scheme require small computation time. In finite element simulation of auto-body panel stamping processes, the roobustness and stability of computation are important requirements since the computation time and convergency become major points of consideration besides the solution accuracy due to the complexity of geometry conditions. The performnce of the dynamic explicit algorithms are investigated by comparing the simulation results of formaing of complicate shaped autobody parts, such as a fuel tank and a rear hinge, with the experimental results. It has been shown that the proposed dynamic explicit elastic-plastic finite element method enables an effective computation for complicated auto-body panel stamping processes.