항공기용 연료호스의 접촉거동특성에 관한 유한요소해석

Abstract

The high pressure hose has been used widely in the automobile and aircraft such as for the hydraulic systems, pneumatic brakes and oil supply systems, etc. Though employed on different working conditions, most of the hoses have the same features which its structural components have a nipple, socket or sleeve and rubber layers to prevent them from chemical damages and corrosions, and braid layer to improve tensile strength. Due to its structural features, the high pressure hose has the possibilities to cause leakages on metal fitting if the clamping force is too small. The metal fitting can be classified into two categories, namely, primary and secondary metal fitting. The former is made in the hose manufacturing process, namely the crimping process, to clamp the hose with metal components, whereas the latter is for the connection of the hose to the hydraulic system. The crimping process leads to various stress and strain configurations in the hose, which give critical effect on the hose performance. In this paper, the deformation characteristics of an aircraft fuel hose during the crimping process were analyzed using the nonlinear finite element method, to investigate the stress and strain distributions of an aircraft fuel hose assembly at the maximum jaw stroke and at the end of the crimping process. Also it has to follow the specification of AS2078 for the thermal shock burst pressure test, using coupled thermo-structure, to estimate the whole performance of hose and to predict the burst pressure of high pressure hose assembly. It is supposed that the results can provide the useful data to determine the optimal design parameters of the hose.