关键词: 损伤容限, 剩余强度, 裂纹缓慢扩展

Abstract: A brief introduction to the study of damage tolerance behaviour of one type of main landing gear structure is given in this paper. The study is performed with a landing gear which involves the complete procedure from fatigur crack initiation to crack growth, residual strength and structural overall failure. First of all, real fatigue cracks of the structure are obtained by fatigue testing, then damage tolerance behaviour is estimated, the fatigue and damage tolerance of the landing gear was measured out. It is shown that cracks involved in the principal critical area have a characteristic of slowly growing, and the structure which has crack tolerance satis-fys the requirement of residual strength. Higher performance of safety and reliability can be obtained by using damage tolerance method to design the landing gear structure.

Key words: damage tolerance, residual strength, slowly growing crack