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Error Analysis and Improvement of the Timoshenko Beam based Finite Element Model for Multi-Stepped Beam Structures  

홍성욱 (금오공과대학교 기계공학부)
이용덕 (LG 이노텍)
김만달 (금오공과대학교 대학원)
Publication Information
Journal of the Korean Society for Precision Engineering / v.20, no.10, 2003 , pp. 199-207 More about this Journal
Abstract
The Timoshenko beam model has been known as the most accurate model for representing beam structures. However, the Timoshenko beam model may give rise to a significant error when it is applied to multi-stepped beam structures. This paper is intended to demonstrate the modeling error of Timoshenko beam based finite element model for multi-stepped beam structures and to suggest a new modeling method to improve the accuracy. A tentative bending spring is introduced into the stepped section to represent the softening effect due to the presence of step. This paper also proposes a finite element modeling method in the light with the tentative bending spring model for the step softening effect. The proposed method rigorously adapts computation results from a commercial finite element code. The validity of the proposed method is demonstrated through a series of simulation and experiment.
Keywords
Timoshenko beam; Multi-stepped beam; Stress concentration; Natural frequency;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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