Research On Mechanical Properties Of Traction Braided Wire Ropes Under Bending

Braided wire rope is widely used in the construction of tension stringing because of its non rotating characteristics.It has become one of the necessary and important tools in construction and the analysis of its mechanical properties is very important for safe construction.Analysis of tension stringing process show that the wire rope after traction drum,It is one of the most dangerous locations where the stress is the most complex.Due to the traction and winding of the drum,the wire rope is subjected to the combined action of tension,bending,torsion and compression.Therefore,it is necessary to study the mechanical properties of the braided wire rope under the bending condition.In this paper,four eight strand braided wire rope were taken as an example,the construction of mathematical model of bending condition were established,When the wire rope passes through the traction drum,the bending stress state is taken as the working condition,through the numerical simulation,the stress and deformation distribution of the wire rope passing through the bending state of the traction drum is studied.Specific research contents are as follows:According to the four eight strand braided wire rope,analysis the phase relationship between the spatial structure and ropes,in the flat state under the wire,explore the bending state of wire rope winding in stocks and shares in the rope in the position change,determine the relationship between the relevant parameters and between the strands of this state.Based on the theory of coordinate transformation and differential calculus,the spiral line equation of wire rope and strand in bending state is established.On the basis of the analysis of the geometric characteristics,the MATLAB software is used to calculate and obtain the curvature variation characteristics of the strand and the side line steel wire.Based on the mathematical model of eight strand braided wire rope under bending state,Taking the YS9-8×19 braided steel wire rope as an example,the geometric model of the bending state is established in the three-dimensional software SolidWorks,and the simplified geometric model of the traction drum is established at the same time,and then set to complete the "rope-wheel" traction winding system model.According to the actual condition of tension stringing,the load and constraint of numerical simulation are determined,and the finite element model of the rope wheel traction winding system is constructed and simulated.Byanalyzing the numerical simulation results,the distribution law of the stress and deformation of the wire rope strand is obtained under the action of tensile force;At the same time,the stress distribution of the steel wire rope under the condition of different pitch and the same boundary condition is obtained by simulating the model with different pitch.Taking the YS9-8×19 braided steel wire rope as an example,the tension bending test was carried out.The test to determine the two schemes from the perspective of qualitative and quantitative analysis,quantitative analysis of the amount of bending tensile test under the same load elongation and simulated elongation were compared;qualitative analysis is obtained by numerical simulation of fracture position and winding bending braided wire rope winding will be bending tensile tests of the maximum stress position point comparison.Based on the above tests,the rationality of the mathematical model and the geometric model of the braided wire rope winding is verified,and the feasibility of the numerical simulation of the wire rope traction system is discussed.