Abstract Machining of carbon fiber-reinforced polymer (CFRP) with less damage remains to be a challenge because of anisotropy and inhomogeneity issues. Flood cooling will reduce the mechanical properties of CFRPs due to its hygroscopicity, however, dry grinding will result in thermal damage and deterioration of surface integrity, which cause it not suitable in aeroengine and aerostructure applications. Aiming to resolve the above gaps, the grinding mechanics for a single grain of CFRPs involving CNT nano-lubricant minimum quantity lubrication (MQL) is explored. To reveal the various fundamental mechanisms in machining CFRP of special transversal grinding and lubrication conditions, four sub-models were developed based on the unique geometries of grain and fiber in contact due to the random fiber arrangements and grain edge shapes under different undeformed chip thicknesses. Specifically, the models account ⅰ) the contact force model between the grain tip and fibers, ⅱ) the local contact stress model of elliptical region between the spherical grain edge and cylindrical fiber, ⅲ) the tensile fracture force model of single fiber regarded as an bending beam fixed at both ends and constrained on the elastic foundation, and ⅳ) the extrusion and shearing force model on the cut fiber section at the grinding groove. Furthermore, the grinding force model is obtained by integrating these sub-models, in which the grain-fiber friction coefficient and grinding mechanics are accurately introduced. Finally, the model is numerically simulated and the trend of force along the entire grinding arc length is obtained. Experimental verifications demonstrate the approach for predicting the grinding force have acceptable accuracy and can successfully capture the mechanics of CFRPs. The model reveals that the tensile fracture force of single fiber has the most contributions to the grinding force.

中文翻译：

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使用碳纳米管纳米润滑剂对碳纤维增强聚合物进行单金刚石颗粒磨削的力学分析和预测力模型

摘要 由于各向异性和不均匀性问题，加工具有较少损伤的碳纤维增强聚合物 (CFRP) 仍然是一个挑战。由于CFRPs的吸湿性，洪水冷却会降低其机械性能，然而，干磨会导致热损伤和表面完整性劣化，使其不适用于航空发动机和航空结构应用。为了解决上述问题，研究了碳纳米管纳米润滑剂微量润滑（MQL）单颗粒碳纤维复合材料的磨削力学。揭示特殊横向磨削和润滑条件下加工 CFRP 的各种基本机制，由于在不同未变形切屑厚度下的随机纤维排列和颗粒边缘形状，基于颗粒和纤维接触的独特几何形状开发了四个子模型。具体而言，模型考虑了ⅰ) 晶粒尖端与纤维之间的接触力模型， ⅱ) 球形晶粒边缘与圆柱纤维之间椭圆区域的局部接触应力模型， ⅲ) 单纤维的拉伸断裂力模型作为一个弯曲梁固定在两端并约束在弹性基础上，和ⅳ) 磨槽处切割纤维截面上的挤压和剪切力模型。此外，通过整合这些子模型得到磨削力模型，其中准确地引入了颗粒-纤维摩擦系数和磨削力学。最后，对该模型进行数值模拟，得到沿整个磨削弧长的受力趋势。实验验证表明，预测磨削力的方法具有可接受的准确性，并且可以成功地捕捉 CFRP 的力学。该模型表明，单纤维的拉伸断裂力对磨削力的贡献最大。