A Study of the Lug Fracture Improvement for Composite Leaf Spring Landing Gear

Shim, Daisung; Jang, Deakhyeon; Park, Chahwan; Kim, Jounghun

doi:2015.18.4.343

J. KIMS Technol > Volume 18(4); 2015 > Article

Journal of the Korea Institute of Military Science and Technology 2015;18(4):343-349.
DOI: https://doi.org/10.9766/KIMST.2015.18.4.343

A Study of the Lug Fracture Improvement for Composite Leaf Spring Landing Gear

Daisung Shim, Deakhyeon Jang, Chahwan Park, Jounghun Kim

¹Sacheon Center, Defense Agency for Technology and Quality
²UAV Team, Korea Aerospace Industries, Ltd.
³Policy Planning Department, Defense Agency for Technology and Quality

판스프링방식 착륙장치의 러그파손 개선 연구

심대성, 장덕현, 박차환, 김정훈

¹국방기술품질원 사천센터
²한국항공우주산업(주) UAV팀
³국방기술품질원 정책기획실

Abstract

This is a study for the improvement of the fractured lug structure that connects the landing gear to the fuselage of the aircraft using the composite leaf spring landing gear. The lug surface was analyzed to find out the cause of fracture. The lug was destroyed by the crack initiation and propagation under the repeated stresses. The frictional wears of the lug structure were proceeded and that affected adversely to the crack. Also, the square protrusion of the lug has a weak shape to bring about stress concentration. The design changes were conducted and the test was performed to verify changed design results.

Key Words: Composite Leaf Spring, Lug, Fractured Surfaces, Wear, Design Change