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为了揭示薄壁锥套在运行过程中产生损伤的运行力学机理,提高其运行可靠性,提出一种用于解决具有宏微观跨尺度问题和大规模非线性接触问题的流固耦合方法。通过对薄壁锥套和轧辊所形成的固体域进行三维静电多极离散,采用改进后的Krylov子空间广义极小残值法(GMRES(m))对其进行优化迭代。其中,弹性摩擦接触域进行点面接触非线性数学规划,耦合界面处采用非匹配网格数,并对微米级油膜进行弹性润滑解析和无厚度处理,同时引入Lagrange族内插函数,建立薄壁锥套在宏微观跨尺度下的运行力学模型。通过薄壁锥套运行力学机理试验,验证本文计算方法在揭示薄壁锥套运行力学行为的正确性。结果表明,薄壁锥套在运行过程中的油膜力场和接触应力场呈三维动态非均匀分布,在复杂交变力场作用下,位于薄壁锥套两端密封槽处的应力奇异性是造成其发生粘结、断裂等破坏的力学原因。在设计阶段必须考虑轧制工况状态,通过设计合适的过盈量和锥套厚度来减小疲劳损伤,提高可靠性。
In order to reveal the operational mechanics mechanism of thin-walled taper sleeve during operation and enhance its operational reliability, a fluid-solid coupling method for solving macro-scale cross-scale problems and large-scale nonlinear contact problems is proposed. The three-dimensional electrostatic multipole dispersion of the solid domain formed by the thin-walled conical sleeve and the roll is optimized and iteratively optimized by using the modified Grybs subspace generalized minimum residual method (GMRES (m)). Among them, the non-linear mathematical programming of point-contact surface is carried out in the area of elastic frictional contact, the number of non-matching grids is used in the interface of coupling, and the elastic lubrication analysis and non-thickness treatment of micro-scale oil film are carried out. Operating Mechanics Model of Conical Sleeve at Macro and Micro Cross-scale. Through the thin-walled sleeve running mechanics test, verify the calculation method in this paper reveals the correctness of thin-walled sleeve running mechanics behavior. The results show that the oil field and the contact stress field of the thin-walled taper sleeve are three-dimensionally dynamically and non-uniformly distributed. The stress singularity at the seal groove at both ends of the thin-walled taper sleeve under the action of complex alternating force field is Resulting in the occurrence of bonding, fracture and other mechanical reasons for the destruction. In the design phase, the condition of rolling conditions must be considered. By designing appropriate interference and taper thickness to reduce fatigue damage and improve reliability.