~*Happy New Year 2023*~
Thank you for using my blog!
~~*~~
Chapter 2
Literature
Review
The
intention of this review is to understand, experimental, analytical and
numerical methodologies used to study the several phenomena that contribute to
the size effect in micro-cutting. To this end, the literature shows that a large
number of phenomena that occur during a metal cutting process especially on a microscopic
scale cause the size effect. These phenomena are listed in Fig. 2.1. In the sections of this chapter, research work pertaining to
modeling of these phenomena and evaluation of their contribution to the size
effect in micro-cutting process have been identified. Also, the discussions
thereafter lead to identification of gaps in the literature and formulation of
objectives of the present work.
The
size effect is a nonlinear increase in specific cutting energy with a decrease
in uncut chip thickness during micro-cutting, which occurs due to several
factors. The size effect in micro-cutting has been reported experimentally and
investigated analytically as well as numerically by several researchers over
the years. A nonlinear increase in the specific cutting energy as uncut chip
thickness decreases, which is a typical trend. Size effect becomes prominent as
the scale of cutting process reduces from conventional cutting to
micro-cutting. Fig. 2.2 shows scales
of specific cutting energy for major metal cutting processes. The effect is
minimal in conventional tensile tests but increases gradually as the scale of
the process goes to grinding [5, 54]. Researchers have attributed the
occurrence of size effect to various phenomena prevailing during micro-cutting
as shown in Fig. 2.1. It should be
noted that factors causing size effect are interrelated and combined effect
will further complicate the phenomenon of size effect in micro-cutting.
2.4 Microcrack formation in the shear zone
2.5 Gross fracture phenomenon ahead of tool-tip
2.6 Workpiece microstructure effect
2.7 Conclusions from the literature review
2.8 Objective and scope of the research
