Analysis Of Mechanical Behavior Of Steel Wire Braided Hose Under Complex Load

Steel wire braided hose(hereinafter referred to as hose)has good bending and fatigue resistance on the basis of strong load-bearing capacity,and can well meet the requirements of transmission auxiliary components for bending resistance and high load-bearing performance in the field of cavitation jet oil pipe cleaning.Its application prospects are very broad.When the rubber hose is in place,it bears the combined effects of bending,stretching,and internal pressure,which puts forward high requirements for its load-bearing capacity.As a vulnerable component,rubber hoses can easily affect the efficient and stable operation of the entire system,so their mechanical behavior must be fully considered when using them.This article takes a rubber hose of type 1SN with a nominal inner diameter of 6.3mm as the research object,and uses finite element analysis method to study the mechanical behavior of the hose under the environment of cavitation jet oil pipe cleaning.The research content of the paper includes:(1)Sample and test the materials used in each structural layer of the rubber hose to obtain the superelastic constitutive parameters of two types of rubber materials and the elastic-plastic mechanical parameters of the steel wire.(2)According to the geometrical structure characteristics of the rubber hose,a parametric construction method of the geometric modeling of the rubber hose is proposed.This model can be used for finite element analysis to calculate the contact state and contact stress between the steel wires in the reinforcement layer of the rubber hose.(3)The mechanical behavior of rubber hoses under tensile/internal pressure,bending/internal pressure composite loads was analyzed using finite element method.Solved the deformation trend of the rubber hose under stress and the distribution of stress and strain in each structural layer.We designed an experimental fixture for measuring the strain of rubber hoses,and verified the reliability of the finite element analysis results through strain measurement experiments.(4)Combining theoretical analysis and finite element analysis results,a criterion for strength failure of rubber pipes is proposed based on whether the equivalent stress of the steel wire in the reinforcement layer of the rubber pipe reaches its yield strength.Based on this criterion,safety assessment was conducted for rubber hose operations.This article provides a relatively complete approach and method for analyzing the mechanical behavior of rubber hoses,which can provide a theoretical basis for the structural design and on-site application of rubber hoses.