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Table 2 Diameters of the holes after drilling carbon fiber-reinforced polymers Porcher, KMU-4E and fibreglass VPS-33

From: Rheonomic phenomenon shrinkage of holes drilled in fibreglass and carbon fibre-reinforced polymer composites

Machining mode parameters Experiment № Time of measurements Porсher KMU-4E VPS-33
Diamond drill HAM 380 drill Diamond drill HAM 380 drill Diamond drill HAM 380 drill
Sm = 50 mm/min (Sr = 0.005 mm/rev) n = 10,000 rev/min 1 Immediately after drilling Ø10.08 Ø10.05 Ø10.10 Ø10.07 Ø10.08 Ø10.02
After 48 h Ø10.07 Ø10.03 Ø10.09 Ø10.06 Ø10.08 Ø10.02
2 Immediately after drilling Ø10.09 Ø10.05 Ø10.89 Ø10.05 Ø10.07 Ø10.03
After 48 h Ø10.07 Ø10.04 Ø10.09 Ø10.03 Ø10.07 Ø10.03
3 Immediately after drilling Ø10.09 Ø10.05 Ø10.07 Ø10.05 Ø10.07 Ø10.03
After 48 h Ø10.08 Ø10.04 Ø10.07 Ø10.04 Ø10.07 Ø10.03
Sm = 75 mm/min (Sr = 0.005 mm/rev) n = 15,000 rev/min 1 Immediately after drilling Ø10.05 Ø10.07 Ø10.07 Ø10.03 Ø10.08 Ø10.03
After 48 h Ø10.04 Ø10.06 Ø10.06 Ø10.02 Ø10.08 Ø10.03
2 Immediately after drilling Ø10.05 Ø10.07 Ø10.05 Ø10.03 Ø10.08 Ø10.04
After 48 h Ø10.03 Ø10.06 Ø10.04 Ø10.02 Ø10.08 Ø10.04
3 Immediately after drilling Ø10.05 Ø10.07 Ø10.05 Ø10.04 Ø10.08 Ø10.04
After 48 h Ø10.02 Ø10.05 Ø10.05 Ø10.04 Ø10.08 Ø10.04
Sm = 300 mm/min (Sr = 0.015 mm/rev) n = 20,000 rev/min 1 Immediately after drilling Ø10.06 Ø10.04 Ø10.05 Ø10.03 Ø10.06 Ø10.03
After 48 h Ø10.03 Ø10.01 Ø10.05 Ø10.02 Ø10.06 Ø10.03
2 Immediately after drilling Ø10.06 Ø10.05 Ø10.07 Ø10.03 Ø10.06 Ø10.03
After 48 h Ø10.03 Ø10.02 Ø10.05 Ø10.02 Ø10.06 Ø10.03
3 Immediately after drilling Ø10.06 Ø10.05 Ø10.07 Ø10.03 Ø10.06 Ø10.03
After 48 h Ø10.05 Ø10.03 Ø10.06 Ø10.02 Ø10.06 Ø10.03