Numerical study on dynamic response of hydraulic pipe subjected to the blast pressure of aircraft tire blowout

It is required that the hydraulic pipe in the landing gear cabin must withstand the impact of a strong blast wave to maintain airworthiness. The article presents the results of analyzing the dynamic behaviors of hydraulic pipes subjected to the blast pressure of aircraft tire blowout. Considering various inflation pressures and blast modes, the distributions of equivalent stresses and deformations in space and time domains under transient jet were discussed using the finite element method. This paper also compared the variations of normal displacements along the axis direction of a hydraulic pipe with two blast modes, and the differences between them were discussed. Moreover, the equivalent static pressure was applied to the pipe model for numerical analysis. Relevant research results showed that it was not sufficient to use equivalent static pressure for safety assessment. Numerical analysis in the present study indicates that the hydraulic pipe will bear extremely severe impact by high-speed jet released in a tire blowout. Both inflation pressure and blast mode are the key factors that can significantly influence the dynamic responses of hydraulic pipes. According to the analysis results, it was found that the failure of the hydraulic pipe will probably appear in the areas near the two ends of the pipe. The conclusions acquired can provide important references for the future design of a hydraulic pipe in the landing gear cabin.