Abstract
The interaction between adjacent asperities is a typical characteristic of the grinding process and plays an important role in the material removal mechanism. Therefore, in order to systematically investigate the formation mechanism of the subsurface damage, a precision grinding contact model between the diamond particle and optical glass with adjacent asperities is proposed in our research. The initiation and propagation mechanism of median/lateral cracks under residual stress, the propagation rules of the stress waves on the subsurface, and the interaction between the subsurface damage under stress superposition effect are fully investigated by a theoretical analysis and finite element simulation. The simulation results of the precision grinding model are verified by experiments, which show that the proposed numerical analysis model is reasonable and the finite element analysis process is feasible.
Highlights
With the development of scientific technology, optical components are in increasing demand and widely used, which leads to a higher demand for the processing quality of optical components.as a typical hard and brittle material, an optical component will inevitably lead to surface damage or subsurface cracks in the processing
How to effectively control subsurface damage during processing has been the focus of research [1,2,3,4,5,6]
All these studies have great significance for understanding the initiation and propagation mechanisms of subsurface damage of brittle materials, but the interaction between residual stresses generated by adjacent asperities is neglected
Summary
With the development of scientific technology, optical components are in increasing demand and widely used, which leads to a higher demand for the processing quality of optical components. Lawn and Marshall et al [7,8] studied the initiation and propagation of radial and lateral cracks under the residual stress generated by single abrasive grain indentation. The distribution of main shear stress and failure mechanism around the indenter, which is caused by the dynamic or quasi-static contact of the hard steel balls, is analyzed It does not involve the study of brittle materials and the stress variation in the process of subsurface damage is neglected. Chen et al [17,18] studied the subsurface damage during grinding, and the relationship between subsurface damage and abrasive parameters is studied by single abrasive indentation experiments All these studies have great significance for understanding the initiation and propagation mechanisms of subsurface damage of brittle materials, but the interaction between residual stresses generated by adjacent asperities is neglected.
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