Modeling and influence of thrust force torque and delamination during drilling of natural fiber composite

Abstract

Natural fiber composites are named sustainable, renewable environmentally friendly materials. Machining the fiber reinforced composite is difficult due to their anisotropic and heterogeneous nature. Computer numerical controlled drilling caused severe delaminating at the entry and exit of the drilled hole. These can be minimized in several ways such as process parameters, fabrication method, and reinforcement arrangements (Orientation/Treatment/Aspect ratio/Fiber volume fraction). Thrust force and torque are caused machining of composites, it can be controlled by spindle speed, feed rate, and cutting velocity. It has been observed that the output responses such as thrust, torque, delamination peel up and push out of composites depend on the diameters of the drill bit (6, 8, 10 mm), cutting speeds (1000, 2000, 3000 rpm), and feeds (10, 20, 30 mm/min). Total 27 numbers of holes were drilled based on Taguchi L‐27 factorial design orthogonal array. Response surface methodology has been employed to compare input drilling parameters and output responses. It is found that a smaller diameter drill bit of 6 mm with a higher speed of 3000 rpm and lesser feed of 10 mm/min produced high‐quality holes.

Reducing delamination risk with response surface methodology-supported drilling analysis for Nomex® aramid fiber composites

“…Higher R 2 values indicate a better fit of the model to the data. 35 In this study, the R 2 values for thrust force were 98.82%, indicating that the model explains 98.82% of the variability in thrust force. For torque, the R 2 value was calculated as 93.01%, suggesting that the model explains 93.01% of the variability in torque.…”

Micro drilling characterization of the carbon and carbon–aramid (hybrid) composites

“…Delamination is influenced by various machining factors, such as tool geometry, thrust force, material properties, and cutting conditions. [18][19][20][21] The process of drilling micro-holes (micro drilling) in fiber composites is known as micro-hole drillability. This process requires the use of specialized tools and techniques to manufacture holes with diameters that are often less than 1.0 mm.…”

“…This defect is particularly concerning as it negatively impacts the mechanical properties, including fatigue strength, leading to a reduction in component life. Delamination is influenced by various machining factors, such as tool geometry, thrust force, material properties, and cutting conditions 18‐21 . The process of drilling micro‐holes (micro drilling) in fiber composites is known as micro‐hole drillability.…”