Measurement and optimisation of residual tensile strength and delamination damage of drilled flax fibre reinforced composites

Nasir, Aiman Akmal Abdul; Azmi, Azri; Khalil, Ahmad

doi:10.1016/j.measurement.2015.07.046

Cited by 84 publications

(23 citation statements)

References 35 publications

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“…Drilling of natural fiber composites has been investigated in few research works [8][9][10][11][12][13]. All these works have concluded that the feed rate and cutting speed are seen to contribute the most to the delamination effect.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the use of high cutting speed and low feed leads to minimize delamination on drilling at hole extremities. However, considering high cutting speed and low feed in drilling natural fiber composites induces the maximum residual tensile strength which is not desirable for machining productivity and cutting edge sharpness [9]. Furthermore, it has been shown that the optimum drill point geometry for synthetic fiber composite laminates is not suitable for natural fiber-reinforced laminates because of the difference in the constituents and the material removal mechanisms [13].…”

Section: Introductionmentioning

confidence: 99%

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Friction scale effect in drilling natural fiber composites

Chegdani

Mansori

2018

Tribology International

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This work aims to investigate the multiscale tribological behavior when drilling natural fiber composites by changing the tool-composite interface trough the modification of the tool coating. Drilling experiments were carried out on bidirectional flax fibers reinforced polypropylene resin using the same drilling tool geometry with three different coating properties. Results show that the tribo-mechanical behavior of the drilling operation is affected by changing the tool coating at different scale levels. This multiscale behavior is related to the intrinsic friction properties of each coating nature that influence the tribo-contact at the interface between the cutting tool edge and the composite surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Friction scale effect in drilling natural fiber composites

Chegdani

Mansori

2018

Tribology International

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“…Abdul Nasir et al [12] researched the influence of drilling conditions on the strength of flax fiber reinforced polymer composite using the Taguchi method. Their study showed that the influence of drill bit type was negligible and that lowest feed rate and highest spindle speed caused minimum loss of strength of composite.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Tensile Load of Drilled CFRP by Artificial Neural Network

Yenigün

Kılıçkap

2018

Applied Sciences

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The application areas of carbon fiber reinforced plastics (CFRP) have been increasing day by day. The machining of CFRP with incorrect machining parameters leads in huge loss cost and time. Therefore, it is very important that the composite materials are machined with correct machining parameters. The aim of this paper is to examine the influence of drilling parameters on tensile load after drilling of CFRP. The drilling operations were carried out on Computer Numerical Control (CNC) by Tungsten Carbide (WC), High Speed Steel (HSS) and Brad Spur type drill bits with spindle speeds of 1000, 3000 and 5000 rpm and feed rates of 0.05, 0.10 and 0.15 mm/rev. The results indicate that the surface roughness, delamination and thrust force, were affected by drilling parameters therefore tensile load was also affected by the same parameters. It was observed that increase in surface roughness, delamination and thrust force all lead to the decrease of tensile load of CFRP. If the correct drilling parameters are selected; the decrease in tensile load of CFRP can be saved up to 25%. Furthermore, an artificial neural network (ANN) model has been used to predict of tensile load. The results of the ANN model are in close agreement with the experimental results.

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“…A reduced mechanical strength eventually causes breakdown in the composite parts prior to its intended usage or life. 5 Most previous studies focused on drilling process optimisation to alleviate drilling-induced delamination damage. However, based on Lambiase and Durante, another equally important aspect of research involves the evaluation of the open-hole residual tensile strength of a composite such that the degree of damage on a drilled hole or notch can be determined.…”

Section: Introductionmentioning

confidence: 99%

Tensile behaviour of open hole flax/epoxy composites: Influence of fibre lay-up and drilling parameters

Nasir

Azmi

Lih

et al. 2018

Journal of Composite Materials

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The present study reports on a systematic experimental test that evaluates the effect of drilling parameters on the open-hole tensile properties of flax fibre epoxy reinforced laminates. Additionally, three lay-up configurations of the flax fibre, namely, [0°/90°]6, [0°]6 and [±45°]6, were investigated and compared. The results demonstrated that the [0°]6 lay-up configuration was superior in terms of mechanical or tensile strength retention of the composites given an 8 mm hole. Conversely, damage due to delamination was not significant due to the changes in feed rate and cutting speed. This suggests that the drilling parameters were less sensitive towards the mechanical strength of the flax fibre composites with the drilled hole. The less severity of the delamination can be attributed to the high fracture toughness (high mode I critical strain energy release) of the flax fibre when compared with that of the synthetic fibre reinforced composite counterparts. The use of the step drill bit design also potentially contributes to the reduced severity of the delamination damage to the flax fibre composites.

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Measurement and optimisation of residual tensile strength and delamination damage of drilled flax fibre reinforced composites

Cited by 84 publications

References 35 publications

Friction scale effect in drilling natural fiber composites

Friction scale effect in drilling natural fiber composites

Prediction of the Tensile Load of Drilled CFRP by Artificial Neural Network

Tensile behaviour of open hole flax/epoxy composites: Influence of fibre lay-up and drilling parameters

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