Abstract: This paper describes a pushing-cut process of two
stacked polycarbonate (PC) sheets. The cutting line force of the facet (single
line, two-line) blade on the stacked PC sheets was measured and the cutting
deformation of the upper PC sheet was observed with a CCD camera in order to
reveal the stacked structure effect on deformation flow of the upper PC sheet.
The side view of the upper PC sheet was observed with respect to indentation of
the blade by varying the blade tip angle a and comparing the
contact friction of the stacked PC sheets. The inclined angle b, the elevation angle g and the necked height of the
sheared upper PC sheet (worksheet) were characterized with the blade apex angle a. It was found that, compared with the single line blade, a certain range
of apex angle of two-line blade was superior for getting a good cutting profile
of the worksheet, when the bent-up angle of the worksheet was less
than a certain value under low contact pressure condition. The sheared profile
of the worksheet was statistically classified in two deformation modes A and B
which depended on the work flow beneath the blade tip and the sinking
deformation of the underlay (lower PC sheet).
Keywords and phrases: dynamic stability, chaotic behavior, boundary sliding, statistical classification, plasticity and elasticity.
