Analysis of Drilling Behaviour in Jute Fibres Reinforced Natural Composites

Figures & data

Figure 1. Experimental setup.

Figure 2. Jute composite plates fabrication process.

Table 1. Drilling parameters.

Feed (mm/rev)	Speed (rpm)
0.05	3000
0.10	5000
0.15	7000

Table 2. Technical characteristics of the accelerometer used in the experiment.

Properties	Value
Measuring range	±500 g
Sensitivity	9.82 mV/g
Transverse sensitivity	0.2%
Resonant Frequency	54.0 kHz
Temperature	−54–120°C

Figure 3. Delamination factor calculation.

Table 3. Drilling test results.

Exp. No	Feed (mm/rev)	Speed (rpm)	Force (N)	Vibration (Hz)	Roughness (µm)	Hole Ent. (fd)	Hole Ext. (fd)
1	0.05	3000	33	0.9066	4.680	0.1786	0.1647
2	0.10	3000	42	0.9159	4.323	0.2584	0.1701
3	0.15	3000	55	0.9370	5.020	0.2441	0.1813
4	0.05	5000	30	0.9172	2.717	0.2661	0.2715
5	0.10	5000	38	0.9215	3.867	0.2249	0.3068
6	0.15	5000	52	0.9184	3.672	0.3417	0.3537
7	0.05	7000	28	0.9228	2.541	0.2532	0.2432
8	0.10	7000	35	0.9116	3.127	0.2053	0.2791
9	0.15	7000	47	0.9184	3.004	0.2536	0.2382

Figure 4. Thrust force diagram in drilling.

Figure 5. Change in thrust force with respect to feed and revolution.

Figure 6. Thrust force distribution graph.

Table 4. ANOVA results of the thrust force.

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Regression	2	728.17	364.083	137.97	0
Spindle Speed	1	66.67	66.667	25.26	0.002
Feed Rate	1	661.5	661.5	250.67	0
Error	6	15.83	2.639
Total	8	744

Figure 7. Variation in vibration with feed and speed.

Table 5. ANOVA results of vibration.

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Regression	2	0.000132	0.000066	0.91	0.451
Spindle Speed	1	0.000008	0.000008	0.11	0.755
Feed Rate	1	0.000125	0.000125	1.71	0.238
Error	6	0.000436	0.000073
Total	8	0.000568

Figure 8. Effect of feed and speed on surface roughness.

Table 6. Drilling parameters-Roughness ANOVA results.

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Regression	2	5.2887	2.6443	16.88	0.003
Spindle Speed	1	4.7740	4.7740	30.47	0.001
Feed Rate	1	0.5147	0.5147	3.28	0.120
Error	6	0.9402	0.1567
Total	8	6.2289

Figure 9. Effect of feed and speed on temperature.

Table 7. Drilling parameters-Temperature ANOVA results.

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Regression	2	5456.7	2728.33	94.69	0.000
Spindle Speed	1	4592.7	4592.67	159.39	0.000
Feed Rate	1	864.0	864.0	29.98	0.002
Error	6	172.9	28.81
Total	8	5629.6

Figure 10. Hole inner layers and temperature variation.

Figure 11. Determination of the delamination area by image processing method.

Figure 12. Variation in the delamination coefficient the processing parameters.