环形金刚石线锯切割YAG晶体的亚表面损伤预测

YAG （Y₃Al₅O₁₂）晶体亚表面损伤降低材料使用性能和寿命。本研究基于经典脆性固体断裂力学模型，并引用中位裂纹深度计算式，得到中位裂纹是脆性材料亚表面损伤的主要因素。通过金刚石磨粒数统计和金刚石线锯切削参数总结，获得单颗磨粒切削深度并计算切削投影面积，得到单颗磨粒所受法向和切向力，然后预测亚表面损伤裂纹深度与金刚石线速度v_s、进给速度v_w、切割材料性质、电镀锯丝上金刚石颗粒粒度分部等有很大关系，为硬脆材料切割后亚表面损伤预测提供依据。最后提出该模型需要进一步通过实验修正的必要。 

Prediction of subsurface damage of endless diamond wire sawing YAG crystal

The material performance and the service life of YAG (Y₃Al₅O₁₂) crystal are reduced due to subsurface damage.Based on the classical fracture mechanics model of brittle solids and the formula to calculate median crack depth, it is found out that the median crack is the main factor of subsurface damage (SSD) of brittle material.Through the statistics of the number of diamond grits and the summary of diamond wire cutting parameters, the cutting depth, the normal and tangential forces of single abrasive grain and the cutting projected area was calculated, it is predicted that SSD is closely related to the diamond wire speed v_s, feed speed v_w, cutting material properties, particle size distribution of diamond on electroplated saw wire, and so on.Finally, it is suggested that the model needs further revision through experiments.