Registration and Modelling of Polymers Stress Propagation in Controlled Directional Fracture Processes by Microcutting and Indentation

摘要

At present time the precision and ultraprecision diamond single-point machining is the most effective technological method for optical, photonic and bioengineering polymeric components surface generation. Essential properties of polymer material in conjunction with correct geometrical form and special micro- and nano-geometrical structure of the surface layer allow to provide a high level of the operational characteristics for finished production. Providing for high quality surface layer demands to avoid the critical deformations and remanent strains in cut material as a result of contact processes, plastic and elastic deformations of the thermoplastic polymer material and heat exchange in the cutting zone. Practically, the single-point cutting process is a process of macro- and microindentation with directional deformation and posterior fracture of material by cutting tool, which is purely comparable with pyramidal or wedge indenter. But subject to a real magnitude of a cutting edge radius (which quite material for microcutting) we can consider this process as an analogy of boll indentation. Application of the experimental results and theoretical computations of polymer materials macroindentation process by pyramidal, cone, ball, wedge and all-round combined diamond and steel indenters is a real basis for elaboration of the Cutting Zone Physical Model as part of the comprehensive physical-chemical model of the polymer high quality surface layer forming process by precision micromachining.