光学镜片亚表面损伤形成数值模拟与分析

针对当前光学镜片亚表面损伤的研究重点主要集中在加工工艺参数及磨粒粒径、分布等方面的现状，基于脆性材料压痕断裂理论，深入分析了加工过程所导致光学镜片亚表面损伤，对不同锐度角的磨粒在相同载荷不同加工速度下与光学镜片表面间的抛光过程进行了微观动态仿真。获得了在不同加工参数作用下磨头与镜片表面间的摩擦接触、应力应变分布及亚表面损伤等情况，归纳出亚表面损伤裂纹深度、亚表面损伤空穴深度、体积去除率、表面破损率、磨粒锐度角及磨抛速度等相关参数之间的关系，并得出如下结论：当磨粒锐度角为54°~58°,加工速度为7～8m/s时，加工后的镜片在保证一定加工效率的同时，产生的亚表面损伤及表面破损率最小。

Numerical Simulation and Analysis on Formation of Subsurface Damages of Optical Lenses

In view of the current research on the subsurface damages of the optical lenses, people mainly focused on the process parameters and abrasive particle size, distribution, and et al. Based on the theory of indentation fracture of brittle materials, this paper analysed a series of processes which led to subsurface damages of the optical lens, and then finished the micro dynamic simulation of the polishing process of optical lens surfaces under the different sharpness angles of the grains,and with the same load and the different processing speeds. Finley, this paper obtained the frictional contact, the stress and strain distribution and subsurface damages between abrasive and the lens' surface. The relationship among the relevant parameters of the subsurface damage depth of crack, the subsurface damage depth, hole volume removal rate, surface damage rate, abrasive sharpness angle and grinding speed was summed up. When the grinding grain sharpness angle is as 54～58 degrees, the processing speed is as 7～8m/s, then with the required processing efficiency subsurface damages and the damage rate of the machined lenses are of the minimum.