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目的:获得有效的高精度切屑形貌仿真方法。创新点:通过比较不同切削参数下采用光滑粒子流体动力学模型和有限元模型仿真获得的切屑形貌,证明光滑粒子流体动力学模型可以很好地实现对节状切屑的仿真,而不需要额外的几何或基于网格的切屑分离准则。方法:基于有限元和光滑粒子流体动力学的切削形貌仿真方法。结论:通过比较不同切削参数下采用光滑粒子流体动力学模型和有限元模型仿真获得的切屑形貌,证明了基于裂纹形成与扩展理论,采用合理疲劳参数的标准Johnson-Cook模型完全可以实现对节状切屑形成过程的仿真,也即无需采用修正的Johnson-Cook模型。同时证明了有限元模型和光滑粒子流体动力学方法均可满足不同切削速度和进给量条件下的切削力和切屑形貌仿真。
Objective: To obtain effective high-precision chip topography simulation method. Innovative point: By comparing the chip morphology obtained by the smooth particle hydrodynamic model and the finite element model simulation under different cutting parameters, it is proved that the smooth particle hydrodynamics model can well simulate the nodular chip without additional Geometry or grid-based chip separation guidelines. Methods: Cutting topography simulation method based on finite element and smooth particle hydrodynamics. CONCLUSIONS: By comparing the chip morphology obtained with the smoothed-particle hydrodynamic model and the finite element model under different cutting parameters, it is proved that the standard Johnson-Cook model with reasonable fatigue parameters can be used to implement Shaped chip formation process simulation, that is, without the use of modified Johnson-Cook model. At the same time, it is proved that both the finite element model and the smooth particle hydrodynamics method can satisfy the cutting force and chip topography simulation under different cutting speed and feed rate.