Investigation of Nanoscale Scratching on Copper with Conical Tools Using Particle-Based Simulation
Investigation of Nanoscale Scratching on Copper with Conical Tools Using Particle-Based Simulation
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DOI：
10.1007/s41871-023-00179-5
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发表时间：
2023-03
影响因子：
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通讯作者：
Anuj Sharma;S. Kulasegaram;E. Brousseau;K. Esien;Dan Read
中科院分区：
文献类型：
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作者：
Anuj Sharma;S. Kulasegaram;E. Brousseau;K. Esien;Dan Read
采用光滑粒子流体动力学（SPH）方法对不同负前角的锥形刀具进行了纳米级刻划过程的数值模拟。实现的模型，使沟槽轮廓，刮擦力，和沟槽下的残余塑性应变的地形的研究。工件采用弹塑性材料模型，刀具与工件的相互作用采用赫兹理论的接触模型。一个内部拉格朗日SPH代码进行纳米划痕模拟。的SPH模拟结果进行了比较，在文献中的纳米级划痕实验数据。模拟结果表明，法向力比切削力更占主导地位，这与60°负前角圆锥形刀具的实验结果一致。此外，模拟的沟槽轮廓与上述实验中产生的沟槽轮廓非常一致。数值模拟还表明，随着划痕深度和前角的增加，法向力和切削力都增加。虽然注意到在纳米划痕的切削和犁削机制，犁削机制是更占主导地位的负前角增加。还观察到，残留的塑性应变存在于凹槽表面以下，并且对于刀具前角的更多负值和更高的划痕深度，划痕凹槽下方的塑性变形层厚度更大。
In this study, a modeling approach based on smooth particle hydrodynamics (SPH) was implemented to simulate the nanoscale scratching process using conical tools with different negative rake angles. The implemented model enables the study of the topography of groove profiles, scratching forces, and the residual plastic strain beneath the groove. An elastoplastic material model was employed for the workpiece, and the tool–workpiece interaction was defined by a contact model adopted from the Hertz theory. An in-house Lagrangian SPH code was implemented to perform nano-scratching simulations. The SPH simulation results were compared with nanoscale scratching experimental data available in the literature. The simulation results revealed that the normal force was more dominant compared to the cutting force, in agreement with experimental results reported for a conical tip tool with a 60° negative rake angle. In addition, the simulated groove profile was in good agreement with the groove profile produced in the aforementioned experiment. The numerical simulations also showed that the normal and cutting forces increased with the increase in the scratching depth and rake angle. Although the cutting and ploughing mechanisms were noticed in nano-scratching, the ploughing mechanism was more dominant for increased negative rake angles. It was also observed that residual plastic strain exists below the groove surface, and that the plastically deformed layer thickness beneath a scratched groove is larger for more negative values of the tool rake angle and higher scratching depths.