Study On Mechanical Model And Numerical Analysis Of Steel Wire Rope

Wire rope, having its complicated configuration, will give highly nonlinear responses when it is loaded. Every respect of the research field on wire rope is taken into great consideration by scholars around world. The fundamental mechanical model and the numerical analysis provides theoretical basis for analyzing and designing wire rope, as well as making criterion of changing used ropes, which has great value to be studied.In this paper, firstly, a new expression is introduced to describe the deformation of steel wire before and after loading, and equations of equilibrium for loaded wires are established based on the comparison between the new expression and the traditional curve description. The relations of the new expression and the loads are established while complete mathematical model is derived on the basis of equations of equilibrium considering two kinds of different load cases, which provides a theoretical basis for wire rope theory research, rope design and validation of other models.Secondly, parametric equations for central line for wire and rope will be given after comparing the methods of establishing geometry model for straight wire rope. Geometry of wire rope(IWRC) will be studied and the parametric equations of wire rope(IWRC), which are the fundamental principles to build 3D model in UG software, will be changed to fit different types of ropes. Using the discussed geometry to adjust the tolerance in UG will insure the accuracy of 3D model.Thirdly, with the help of Patran software, a new finite model will be established for the 1?6 straight strand and IWRC straight wire rope which is based on 3D model and with the help of Nastran, the result of FEA contact model will be solved. Variation of axial load with axial strain and load distribution will be given for fixed-end situation. In order to verify the efficiency of established model, FEA results will be investigated with theory results and experimental results. Tolerances between each of two results are permissible.Lastly, strain relations which are the guarantee for global optimization between different wires and strands in straight 6?19 Seale wire rope will be provided. Appropriate optimization objectives and constraints are chosen to accomplish parameter optimization based on working condition while corresponding mathematical models are derived. In order to carry out the optimization where complex formulas of strain relations are used, a special treatment of optimization method is specialized. Local optimization and global optimization are also considered. With the help of Matlab software, different optimization procedure are fulfilled. Various optimization results are given to verify the effectiveness of the optimization process.