Shot peening is a mechanical surface treatment widely utilized to enhance the fatigue strength of gears by surface work hardening and inducing compressive residual stresses while also altering the surface roughness. This study is aimed at developing a detailed numerical model of dual shot peening on case hardened gears by considering the variation of material properties through the thickness. Two different approaches were implemented to estimate the gradient material properties of case-hardened steel. In the first approach, a set of experimental tests and finite element modeling of an indentation were utilized to obtain the stress-strain response of the gradient structure using inverse analysis. In the latter approach, empirical relations were used to adjust the flow stress to the local hardness variation through the thickness. The intricate geometry of the gear also necessitated simulating the shot kinetics on the gear tooth using appropriate impact angles. Various modeling approaches were incorporated to consider the deviation of the impact angle due to geometrical features. The results indicate that a local 3D cubic cell model can be successfully implemented to predict the final distribution of residual stresses and surface roughness. The results are critically discussed in terms of the applied modeling approaches.

喷丸处理是一种机械表面处理方法，被广泛用于通过表面加工硬化和产生压缩残余应力来提高齿轮的疲劳强度，同时还改变表面粗糙度。这项研究旨在通过考虑材料性能随厚度的变化，开发出一种表面硬化齿轮双喷丸强化的详细数值模型。实施了两种不同的方法来估计表面硬化钢的梯度材料性能。在第一种方法中，利用一组实验测试和压痕的有限元建模，通过反分析获得梯度结构的应力-应变响应。在后一种方法中，使用经验关系式将流动应力调整为通过厚度的局部硬度变化。齿轮的复杂几何形状还需要使用适当的冲击角来模拟齿轮齿上的弹丸动力学。纳入了各种建模方法，以考虑由于几何特征而导致的冲击角偏差。结果表明，可以成功地实现局部3D立方单元模型，以预测残余应力和表面粗糙度的最终分布。根据应用的建模方法对结果进行了严格的讨论。结果表明，可以成功地实现局部3D立方单元模型，以预测残余应力和表面粗糙度的最终分布。根据应用的建模方法对结果进行了严格的讨论。结果表明，可以成功地实现局部3D立方单元模型，以预测残余应力和表面粗糙度的最终分布。根据应用的建模方法对结果进行了严格的讨论。