Crack Analysis of Aero-engine Oil-providing Pipe

Objective To investigate the failure mode and reason for oil-providing pipe crack.Methods Comprehensive analysis of aero-engine oil-providing pipe was carried out through trace observation,macro and micro characteristics in combination with X-ray energy analysis.Results The failure of the pipe was due to fatigue crack,and the fatigue crack started from the first trough surface of the ripple pipe.Conclusions The assembling stress was the main reason for this crack failure,and it was formed owing to the different axis between the bended pipe and the ripple pipe during the welding process.