Two kinds of high-pressure hose fitting assemblies comparative analysis of nonlinear finite element

Two kinds of high-pressure hose fitting assemblies comparative analysis of nonlinear finite elementHigh fluorine plastic hose is usually made ​​of Teflon inner tube, stainless steel wire reinforcing layer and the metal connector which is widely used in hydraulic equipment, air conditioning systems [1], passing control of rudder control aircraft Jic hydraulic fittings pressure and energy , is a modern aircraft, "ligament." In the pulsating experiments or actual use, due to design or manufacturing reasons, coupled by high / low temperature, the working medium pressure pulsation and other effects, there is a steel wire reinforced hose layer of broken wire, the inner tube burst hose connector near fracture and other issues (Figure 1), causing serious hazard to flight safety, because the hose rupture resulting in the loss of the hydraulic system pressure causing frequent instances of flight accidents [2]. Figure 1 near the connector hose assembly hose assembly damaging effects of the quality factors of the thickness of the Teflon tube, the wire winding angle increase, the hose between the wires of the layer and enhancement of clearance or interference, the hose the amount withheld during assembly and joints of the structure and so on. At present, for stress analysis of filament-wound structure, mainly based on grid-based theory and the theory of complex analysis methods, but they can not handle geometry, material and load discontinuities, and does not consider the transverse shear and can not accurately predict the structure of local stress [3], and thus from the theoretical analysis of the various factors on the quality of the hose assembly,