| Wire rope is a spiral flexible member made by multiple twisting.Its toughness is good and its performance is stable.With the increase of mine depth,the wire rope is more prone to fatigue failure and lead to safety accidents.Most of these failures are caused by the cumulative action of tensile,torsional and bending loads,but the complex structure makes the calculation of wire rope theory very complicated and difficult to carry out.Therefore,using finite element method to carry out stress deformation analysis and fatigue life study of wire rope has certain guiding significance for the improvement of wire rope structure and life evaluation.The tension of the shaft lift 6×36WS+IWRC wire rope,the geometric and mechanical characteristics in strands are theoretically analyzed and numerically simulated.The overall stress-deformation characteristics and fatigue life distribution of wire rope under tensile and tensile-torsion loads are studied.The calculating formula of curvature and deflection of steel wire is deduced.By means of Matlab analysis,the distribution of curvature and deflection of steel wire with rotation angle is obtained.The stress of wire rope at different speed stages of shaft hoisting is analyzed,and the variation curve of wire rope tension is obtained.Based on the Costell theory,the relationship between the stress and deformation of steel wire is calculated and analyzed,and the spiral angle ? is the main factor affecting deformation,axial force and torque.The formula for calculating tensile stress of steel wire is deduced,and the distribution law of tensile stress of steel wire in different positions in independent rope core is solved.The spatial curve equations of the primary and secondary spiral lines are established,and the 3D solid models of 1×37 IWS and 6×36WS+IWRC wire ropes are established based on Solidworks software.The finite element analysis model was created in ANSYS Workbench,and the stress-strain characteristics of wire rope under tensile load were analyzed.It is obtained that the stress deformation on the whole rope surface is spatially staggered along the twisting direction,the stress at the contact position between the wires is large,and the stress deformation distribution of the steel wire at different parts of the middle section is symmetrical with the change of the period ?,and the stress at the distance of the core wire is approximately decreasing.The effect of torsional factors on the stress of wire rope in deep well lift was investigated.It was found that the whole stress level of wire rope under tight twist and loose twist load was much higher than that under only tensile load.By analyzing the 1×37 IWS single twist wire rope with different twisting direction combination,it is found that the twisting direction combination has a great influence on the stress deformation of the wire rope,and the mechanical properties of the left-right-right twisting mode are better than that of the left-right-left twisting mode.The fatigue life of wire rope under tensile,tight twisting and loose twisting load is analyzed.The fatigue life of wire rope under three loading types is helical symmetry structure along the direction of twisting,and the life of contact position between wires is small,which is corresponding to the stress analysis result.The fatigue life of wire rope is the lowest under loose twist load and the highest under pure tensile load.Different stress amplitudes are set up to simulate the influence of different depths on fatigue life.It is found that the fatigue life of the deep-well lifting wire rope is reduced to very low by loose twist and tight twist at the upper and lower ends,and the decreasing trend becomes slow when the stress amplitude is 0.6.In order to ensure the safety and improve the service life of the wire rope,we should choose the interactive twisting wire rope and strengthen the detection and maintenance of the upper and lower end torsion position.Finally,the wire rope was tested.The average breaking tensile force,bending and torsion fatigue times of the steel wire are higher than those of deep well wire rope respectively,which is consistent with the finite element results,and the correctness of the analysis is verified.Figure[88]Table[14]Reference[85]... |
PDF Full Text Request