Ceramics, being brittle in nature are highly prone to surface damage during machining. However, at depths of cut lower than a critical depth of cut, brittle materials undergo microscopic plastic shearing resulting in a crack-free surface. The transition from ductile to brittle takes place over a finite time and depth variation. The identification and characterization of the transition zone is important to attain damages free surface grinding. This work focuses on the identification of the ductile-brittle transition (DBT) zone in yttria stabilized sintered zirconia via the analyses of the force signatures. An algorithm has been developed for the prediction of the onset and end of the transition zone based on the gradients and fluctuations in the cutting force signals. The visual inspection of the ground surface validates the proposed methodology based on force signal processing. The transition zone characteristics were found to be affected by the process parameters and the tool geometry. The increase in the scratch speed reduced the transition onset depth but had negligible effect on the transition end depth. Smaller tool tip radius resulted in increased surface damage whereas larger tip radius gave a relatively smoother surface finish. This methodology of accurate prediction of DBT zone using cutting/thrust force behavior allows the manufacturers to achieve crack-free surfaces in brittle materials without keeping track of cutting depth during machining. Thus, the prediction of the ductile regime by the analysis of force signals opens new horizons in deciding threshold force and depth values in real time, which should be maintained to achieve a damage free surface during grinding.

易碎的陶瓷在加工过程中极易受到表面损坏。但是，在切削深度低于临界切削深度时，脆性材料会受到微观塑性剪切作用，从而导致无裂纹的表面。从延性到脆性的转变发生在有限的时间和深度变化上。过渡区的识别和表征对于获得无损伤的表面磨削很重要。这项工作的重点是通过力谱分析确定氧化钇稳定的烧结氧化锆中的韧性-脆性转变（DBT）区。已经开发了一种算法，用于基于切削力信号中的梯度和波动来预测过渡区的开始和结束。地面的目视检查验证了基于力信号处理的建议方法。发现过渡区特性受工艺参数和工具几何形状的影响。刮擦速度的增加减小了过渡开始深度，但对过渡结束深度的影响可忽略不计。较小的刀尖半径会导致表面损坏增加，而较大的刀尖半径则会使表面光洁度相对较高。这种利用切削/推力行为精确预测DBT区域的方法，允许制造商在脆性材料中实现无裂纹的表面，而无需在加工过程中跟踪切削深度。因此，通过对力信号进行分析来预测韧性状态将为实时确定阈值力和深度值开辟新的视野，