PSI - Issue 2_B

L. Chang et al. / Procedia Structural Integrity 2 (2016) 309–315 J.G. Williams / Structural Integrity Procedia 00 (2016) 000 – 000

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5

thickness h c was taken from an average of 10 measurements through the section where the corresponding cutting process reached steady-state. When determining the residual radius of curvature, attention has been paid to the initial curling part of the chip because this part of the chip was the least affected by the overlapping effect. The inner and outer of profiles of the initial part of the chip were analyzed by means of least-squares circle fitting, and the radius of curvature of the chip, R, was approximated by

2 i o R R R   where R o and R i are the outer and inner radii of the initial part of the chip, respectively.

Fig. 5. Image of a curled chip (UHMWPE) revealed by cross-sectional polishing.

5. Experimental Data Table 2 Chip measurements h h c

h c /h

R i

R o

R o -R i

R=(R o +R i )/2

e b

γ

tanφ

e b /γ

(e b /γ)(h c /h)

μm

μm

μm

μm

μm

μm

49.68 100.24 148.84 198.36 49.09 92.21 162.73 202.2 50.41 102.36 153.09 201.65 49.33 99.26 147.93 199.92 59.81 100.05 148.71 198.6

59.18 112.65 172.03 229.69 64.41 112.33 191.00 232.82 58.66 118.75 173.40 219.21 62.39 118.45 174.52 230.15 77.63 138.40 192.85 245.76 37.33 72.37 128.63 33.05 69.59 114.88

1.19 1.12 1.16 1.16 1.16 1.31 1.22 1.17 1.15 1.21 1.16 1.16 1.13 1.09 1.14 1.26 1.19 1.18 1.15 1.20 1.30 1.38 1.30 1.24 1.31 1.24 1.21 1.29 1.25 1.10 1.16 1.15 1.14

155.0 258.2 388.6 529.3

218.4 370.1 554.1 758.0

63.4 111.9 165.5 228.7 75.6 113.9 193.3 238.5 58.1 120.2 170.8 225.7 63.7 116.1 173.4 228.5 71.3 133.9 184.9 242.8

186.7 314.2 471.4 643.7

0.16 0.18 0.18 0.18 0.18 0.10 0.07 0.07 0.07 0.08 0.14 0.12 0.12 0.12 0.13 0.07 0.08 0.08 0.09 0.08 0.17 0.17 0.17 0.17 0.17 0.13 0.14 0.12 0.13 0.12 0.12 0.10 0.11

1.57 1.55 1.56 1.56 1.56 1.61 1.58 1.56 1.56 1.58 1.56 1.56 1.55 1.54 1.55 1.59 1.57 1.56 1.56 1.57 1.61 1.64 1.60 1.58 1.61 1.21 1.20 1.23 1.21 1.17 1.18 1.18 1.18

1.04 1.12 1.08 1.07 0.92 1.01 1.06 1.08 1.07 1.07 1.11 1.17 0.96 1.03 1.05 1.08 0.93 0.86 0.93 0.99 1.16 1.23 1.10 1.44 1.31 1.33

HDPE θ=75°

Average:

0.12

0.14

294.5 799.9 1247.8 1471.4

370.1 913.8 1441.1 1709.9 235.3 559.2 831.9 1056.8 471.1 816.4 1173.3 1442.6

332.3 856.9 1344.5 1590.7

HMWPE θ=75°

Avg.:

0.05

0.06

177.2 439.0 661.1 831.1

206.3 499.1 746.5 944.0

UHMWPE θ=75°

Average:

0.08

0.09

407.4 700.3 999.9 1214.1

439.3 758.4 1086.6 1328.4

PP θ=75°

Average:

0.05

0.06

195.8 332.0 475.9 586.9 123.0 223.3 485.6 127.1 267.5 532.3

267.1 465.9 660.8 829.7 167.7 297.6 626.0 158.8 333.6 639.8

231.5 399.0 568.4 708.3 145.4 260.5 555.8 143.0 300.6 586.1

PEEK θ=75°

Average: EPOXY θ=60° Average: EPOXY /RUBBER θ=60° Average:

0.11

0.14

30 60

44.7 74.3

100

140.4

0.11

0.14

30 60

31.7 66.1

100

107.5

0.09

0.10