The Micro Structure Stress Analysis Of The Wind Slewing Bearing And Secondary Development Of ABAQUS

Wind power is a safe, clean and pollution-free green energy,developing wind power industry has become one of the important strategy of energy-saving emission reduction and protect the environment. Although wind power industry is developing very fast in China, But for the yaw bearing and pitch bearing key components mainly rely on import from abroad, Compared with some foreign advanced technology of bearing manufacturing companies, there is still a great gap in terms of carrying capacity, life and reliability, materials and material handling. Slewing bearing is a large-sized bearing widely used in wind turbines, it is one of the key and vulnerable components. This paper takes slewing bearing as research object, Crystal plasticity theory is applied to carry out fine microstructure bearing stress analysis and micro fatigue cracks research, in purpose of providing references for the research of wind power bearing fatigue damage.First, Use Materials Studio software to calculate the bearing steel 21 anisotropic elastic constants of 42 Cr Mo, customize the new constitutive model based on the theory of crystal plasticity, write constitutive relation by use the Fortran programming language, and combined with ABAQUS constitutive material subroutine UMAT, do the secondary development of ABAQUS. To obtain a more accurate simulation results, the crystal grain boundary mesh refinement, the maximum Mises stress is smaller than the previous after refinement, stress concentration is eased.Then, first, Micro fatigue cracks definition and classification as well as micro fatigue cracks initiation and propagation are discussed, determine the location of micro cracks in ring rolling and induce the causes of micro cracks. From macroscopic aspect, the Voronoi method is applied to establish single crystal aggregation finite element model, research on micro deformation mechanics characteristics of bearing material, By the results of microscopic organizational analysis of the impact structure on the micro-crack growth rate and expansion path.