Evaluation of Delamination in Drilling Rice Husk Reinforced Polyester Composites

Abstract

Delamination is recognized as one of the most critical defects that can result from the machining composites. Delamination has been a major form of failure in drilled composite materials due to the composites lack of strength in the drilling direction, which results in poor surface finish, reduction in bearing strength, reduction in structural integrity and ultimately poor performance of the composite. Currently, most of the major research reported delamination address specific of machining fiber glass, graphite fiber or carbon fiber reinforced polymer composites. It is not yet clear how different drilling parameters affect the machinability of natural fiber reinforced polymer composite materials and quality of drilled holes. This paper report the investigation in drilling holes on natural fibre reinforced polyester composites and evaluate its hole quality by measuring delamination. Three different type of drill: twist 118o drill, brad drill and end mill were used. Drilling process is carried out for three spindle speed (1500 rpm, 2000 rpm and 2500 rpm) and three feed rate (0.1 mm/rev, 0.15 mm/rev and 0.2 mm/rev). Brad drill experienced higher delamination values compared to twist and end mill. Increasing of feed rate and spindle speed also caused a relevant increase in the delamination values. It is found that Rice husk reinforced polyester composites delamination value is lower when compared to the glass fiber reinforced polymer.

Experimental study on drilling of jute fiber reinforced polymer composites

“…Although it has been found that the HSS twist drill is not compatible with drilling of glass and carbon fiber reinforced composites, 30,31 the results of current research reveal that the HSS twist drill is compatible for drilling of jute fiber reinforced composite laminates. This conclusion agrees with the results of 10,32 during drilling of NFCs. This simply indicates that the drill geometry which is suitable for drilling of special composite laminate may not be compatible with other type of laminates.…”

Damage mechanisms and constitutive models for natural fiber‐based green composites: A review

“…In the course of the drilling machining operation of rice husk reinforced polyester composites, brad drill caused higher delamination values compared to twist and end mill drill, while an increase in delamination when feed rate and spindle speed are increasing [77]. Rice husk reinforced polyester composites delamination value is lower than the glass fiber reinforced polymer [77]. Also, a twist 118°d rill gives good results in terms of delamination minimization because of a bigger point angle and is well adapted for metal drilling [77].…”

Machining parametric study on the natural fiber reinforced composites: A review

“…104 Some of the tools materials and their geometry affecting the performance of the NFRC are shown in Table 4. [105][106][107][108][109][110][111][112][113][114][115][116][117] The above literature discussed and produced the full information about the parameters such as delamination, torque and trust force which affected the performance of the NFRC. The composite's machining can be broadened by introducing other effective natural fibers that can be surveyed based on their mechanical properties, fiber orientation, and machining ability.…”