A Study of the Effects of Hard Landing on Aircraft Structure

Oh, Yong-Kyu; Sim, Sang-Ki; Shin, Ki-Su

doi:2011.14.5.805

J. KIMS Technol > Volume 14(5); 2011 > Article

Journal of the Korea Institute of Military Science and Technology 2011;14(5):805-811.
DOI: https://doi.org/10.9766/KIMST.2011.14.5.805

A Study of the Effects of Hard Landing on Aircraft Structure

Yong-Kyu Oh, Sang-Ki Sim, Ki-Su Shin

¹
²

Hard Landing이 항공기 구조물에 미치는 영향성 연구

오용규, 심상기, 신기수

¹공군 38전대 정비대대
²국방대학원 무기체계학과

Abstract

Aircraft MLG and wing structures have been recognized as fatigue critical structures and exposed to the risk of fatigue crack initiation and propagation. Furthermore, these structures are frequently subjected to serious dynamic loading condition during a Hard Landing which may lead to their failure. Especially, structural integrity of MLG and wing components is decreased as the flight time increased because of the fatigue damage accumulated on the aircraft. In this study, the effects of Hard Landing on the MLG and wing components of aging aircraft were evaluated by using numerical approach. To achieve the aim, a finite element model has been developed and simulations were conducted by varying the landing conditions. As a result, it was revealed that the high stress concentration phenomenon was occurred at the lower Side Brace of MLG. Thereby, the intensified inspection for the lower Side Brace should be considered to prevent unexpected aircraft mishap.

Key Words: Stress, Fatigue Crack, Hard Landing, MLG(Main Landing Gear), Aircraft