A Study for Rationalization of Lifting Lug Design of Ship Block

J. Ocean Eng. Technol. 1997;11(4):249-261.

선박블록 탑재용 러그구조의 설계합리화를 위한 연구

함주혁

한라공과대학교 조선공학과

Keywords: Lifting Lug, Gap Element, Shackle Pin, Finite Element Method, Structural Analysis, Lug Strength, Optimum design

핵심용어: 탑재용 러그, 갭요소, 셔클편, 유한요소법, 구조해석, 러그강도, 최적설계

Abstract

A basic study on the lifting lug design has performed through the rational and systematic process. In order to evaluate the proper design-load distribution around lug eye investigation of contact force between lifting lug and shackle pin is performed using non-linear parametric analysis idealized by gap element models. Gap element modeling and nonlinear analysis procedures are illustrated and discussed based on MSC/NASTRAN. Some analysis and design guides are suggested through the consideration of several important effects such as stress distribution pattern, circumferential contact force distribution along the lug eye face, loading share rate between lug main plate and doubler, effect of loading direction, relation between applied force and deflection and size effect of shackle pin radius. Additionally optimum design studies are performed and general trends according to the variation of design parameters are suggested.