中文摘要：

对光学玻璃材料BK7进行压痕试验及超声振动变切深刻划试验。通过对BK7表面垂直加载不同的载荷，观察分析不同的载荷下材料表面的变形形式得到了材料分别发生塑性变形，脆塑转变，脆性破坏时的垂直载荷的范围和切削深度的范围。利用超声振动系统对试件进行变切深刻划试验，得到了材料由塑性切削到脆性破坏的连续变化过程的表面形貌。实验结果表明超声振动切削有效提高了临界切削深度。

英文摘要：

Micro - indentation and ultrasonic vibration assisted deep - variation cutting tests of glass BK7 were carried out. The effect of normal applied loads on material deformation modes has been investigated based on the observations of micro - structures of material deformation zones. The dependence of material deformation modes on the depth of cut was studied by ultrasonic vibration scribing test. The experimental results show that the critical depth of cut for brittle - ductile transition can be raised effectively by applying ultrasonic vibration assisted cutting technology.