Abstract:

In order to reveal the operating mechanism of thin-walled cone sleeve damage caused in the running process, and improve the reliability of its operation, a new fluid-solid coupling method is proposed for solving the problem of macro-micro cross-scale problems and large scale nonlinear contact problems. The solid domain formed by sleeve and roll is discretized by three-dimensional electrostatic multipole method and the improved generalized minimal residual method(GMRES(m)) based on Krylov subspace methods is used to optimize and iterate the dense non-symmetric linear equations. Among them, the nonlinear mathematical programming based on point-surface model is used in the elastic friction contact domain, and non-matching grid number is used in the coupling interface. The micron grade oil film is analyzed by elastic lubrication methods and is treated as no thickness. Then Lagrange interpolation function is introduced, and the operating mechanical model of sleeve is established on macro-micro cross-scale. The correctness of this method is verified by the test of the operating mechanics mechanism of the thin-walled cone sleeve. The results show for sleeve in the process of the operation, the distribution of oil film force field and contact stress field are three-dimensional dynamic and non-uniform. And in complex alternating stress field, the high stress singularity of seal groove located at both ends of the sleeve is the mechanics cause of bond, fracture, etc. In the design stage, the rolling condition should be considered, and the fatigue damage can be reduced by the design of the appropriate amount of interference and the thickness of the sleeve.

Key words: macro-micro cross-scale, mechanics mechanism, operating behavior, thin-walled cone sleeve