Strength reliability analysis of the emergency break-away fuse pin of civil aircraft pylon

Abstract

The break-away fuse pin of civil aircraft pylon is an emergency disconnection connector connecting the engine pylon joints and the wing joints. The break-away fuse pin needs to ensure rapid disconnection and clear damage mode during emergency landing. Taking the C919 aircraft IPS break-away fuse pin as the research object, the strength analysis of the fuse pin structure is carried out, and the influence of the diameter-thickness ratio on the failure mode and failure load of the fuse pin is studied. Considering the dispersity of structural size and material parameters of the fuse pin, use neural network response surface method to analyze the reliability and sensitivity of the fuse pin strength and it is found that the main factors affecting the reliability of the fuse pin emergency disconnection are: friction coefficient, the inner diameter of the fuse pin, and the outer diameter of the fuse pin.