式中，hmax是最大划痕深度也就是理论划痕深度，hf是实际划痕深度，L

In the formula, hmax is the maximum scratch depth, which is the theoretical scratch depth, hf is the actual scratch depth, and L is the elastic recovery rate. The change curve of the elastic recovery rate is shown in Figure 9(2). As the particle size of the abrasive particles increases, the elastic recovery rate of scratches tends to decrease first and then increase. Under the condition of the same abrasive grain size, as the depth of scratch increases, the elastic recovery rate gradually decreases.

In the formula, hmax is the maximum scratch depth, that is, the theoretical scratch depth, hf is the actual scratch depth, L is the elastic recovery rate. The graph of the change in the elastic response rate is shown in Figure 9 (2). With the increase of the particle size of the grain, the elastic response rate of the scratches shows the trend of decreasing first and then increasing. Under the same particle size, the elastic response rate is gradually reduced with the increase of scratch depth.

Where, Hmax is the maximum scratch depth, that is, the theoretical scratch depth, HF is the actual scratch depth, and l is the elastic recovery rate. The change curve of elastic recovery rate is shown in Fig. 9 (2). With the increase of abrasive particle size, the elastic recovery rate of scratch decreases first and then increases. With the increase of scratch depth, the elastic recovery rate decreases gradually under the same abrasive particle size.