Mechanical Properties And Life Prediction Ofsteel Wire Rope Of Ultra-deep Mine Hoist Under Tensile Load

With the rapid development of national economy,the demand for mine resources in China has increased greatly,which promotes the exploitation of mineral resources in China to expand to the deeper level.Deep well mining puts forward new requirements for hoisting equipment,but at present,there is no mature research on hoisting equipment above 1500 meters in China,and the design and manufacturing of products are still in a blank,which seriously restricts the implementation of the strategy of deep resource development and utilization in China.As an important part of the equipment system of deep well hoisting,the mechanical properties and fatigue life of steel wire rope are of great significance to the safety production of mine hoisting.Based on the research project of the National Key Basic Research and Development Project 973 project “the Study of the Law of Deformation and Parallel Drive Synchronization Control of Ultra-deep Mine Hoisting System "(project number: 2014CB049403),this paper studies the mechanical properties of steel wire rope under the contact characteristics of steel wire under tension conditions and the wire rope.Fatigue life prediction is carried out to provide theoretical basis and technical basis for theoretical analysis and fatigue life prediction of ultra-deep well hoisting system.The main research of this paper includes:(1)In this paper,the envelope method is used to establish the geometric parameter model of wire rope.This method overcomes the defects of interference caused by excessive curvature change caused by geometric coordinate transformation and Frenet frame method.Taking the complex structure of wire rope as an example,the geometric center line parameter equation of wire rope is established by this method,and the three-dimensional solid modeling of wire rope is realized in the three-dimensional software.(2)The Costello model is used to derive the force formula of the steel wire rope,and the relationship between the axial tensile load of the wire rope and the internal force of the steel wire is obtained.The derived stiffness matrix is compared with the finite element analysis and the stiffness matrix obtained by other models.The results show that the model is comparable to other models in calculating the dimensionless stiffness,because the method considers Poisson's ratio and wire contact.The impact,more in line with the actual situation,can be used in theoretical analysis models combined with other theories for follow-up research work.(3)According to the operating condition parameters of CITIC Heavy Industry Testbed and the material parameters of steel wire rope,the dynamic load variation law of steel wire rope under lifting condition is obtained by Simulink simulation.By combining Costello mechanics model,Hertz contact theory and Coulomb friction theory,the stress distribution law of steel wire rope under dynamic load is analyzed,and the failure law of steel wire contact is found.(4)Based on the dynamic load spectrum of CITIC Heavy Industry Test Bench under lifting conditions,the distribution of equivalent stress under tension load of steel wire rope is analyzed by means of ABAQUS finite element software.Based on the linear damage cumulative theory and ABAQUS finite element results,the fatigue life law of wire rope under different friction factors under dynamic load conditions is simulated and analyzed by using Fe-safe software,which provides theoretical basis and technical basis for further study of fatigue life of wire rope in ultra-deep mine hoisting system.