Comparative analysis of drills for composite laminates

Durão, Luís Miguel P.; Gonçalves, Daniel; Tavares, João Manuel R. S.; Albuquerque, Victor Hugo C. de; Marques, A.T.

doi:10.1177/0021998311421690

Cited by 39 publications

(21 citation statements)

References 28 publications

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“…Details on the drills can be found in [15]. The tool selection is in line with past papers published by the same authors, see [6,12,15,26,33]. Twist drill is still the most common drilling tool used in almost every tool shop, Brad drill is a commercial drill normally available in tool manufacturers’ catalogue and step drill is an experimental prototype tool that has been studied and developed by the first author along the last years.…”

Section: Experimental Work and Discussionmentioning

confidence: 99%

Drilling Damage in Composite Material

et al. 2014

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The characteristics of carbon fibre reinforced laminates have widened their use from aerospace to domestic appliances, and new possibilities for their usage emerge almost daily. In many of the possible applications, the laminates need to be drilled for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, damage assessment methods based on data extracted from radiographic images are compared and correlated with mechanical test results—bearing test and delamination onset test—and analytical models. The results demonstrate the importance of an adequate selection of drilling tools and machining parameters to extend the life cycle of these laminates as a consequence of enhanced reliability.

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Section: Experimental Work and Discussionmentioning

confidence: 99%

Drilling Damage in Composite Material

et al. 2014

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“…Hence, this kind of delamination is called push‐down delamination. More details about the formation of delamination and its determination are given elsewhere .…”

Section: State Of the Artmentioning

confidence: 99%

“…The effect of machining on mechanical properties of polymer composites is still under intensive research. Most of the work directly correlates machining parameters and different tools geometries to the residual static strength and fatigue properties . Therefore, often statistical approaches like Taguchi's method were used to examine a correlation between machining and mechanical properties.…”

Section: State Of the Artmentioning

confidence: 99%

“…Therefore, often statistical approaches like Taguchi's method were used to examine a correlation between machining and mechanical properties. Only a few authors tried to connect data of measured damage extension to the properties found . In these studies, mostly the delamination size described by various delamination factors was utilised .…”

Section: State Of the Artmentioning

confidence: 99%

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Interaction between laminate quality, drilling‐induced delamination and mechanical properties in machining of carbon fibre reinforced plastic (CFRP)

Haeger

Meinhard

Lissek

et al. 2016

Materialwissenschaft Werkst

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In the presented study, the effect of the microstructural quality of carbon fibre reinforced plastic laminates on their machinability is investigated. Additionally, the impact of processing induced porosity and the effect of machining caused delamination on the static strength of the carbon fibre reinforced plastic laminates is examined under variable mechanical loading conditions such as bending, shearing, bearing or tension. Therefore, carbon fibre reinforced plastic laminates based on the advanced carbon/epoxy prepreg T800S/M21 manufactured by Hexcel were cured in two different ways leading to obvious differences in the corresponding microstructural quality. Drilled test specimens with a wide range of typical delamination around the hole have been gained from wear studies of carbide tools. The delamination was quantitatively determined by means of optical inspection techniques. Afterwards, the influence of the loading situation as well as the effect of the laminate orientation on the mechanical strength of the laminates was investigated. The microstructural quality of the carbon fibre reinforced plastic laminates was found to have an obvious influence on matrix dominated mechanical properties such as the apparent interlaminar shear strength. Furthermore, it significantly influences the machinability of the laminate – the porous carbon fibre reinforced plastic tends much more to delaminate than the compact one. In general, the influence of both, porosity and delamination, on static strength strongly depends on the mechanical loading situation. No recognisable effect can be detected for fibre dominated properties like tensile strength. However, for example in bending tests carbon fibre reinforced plastic laminates typically fail due to delamination on the compressive side of the specimen. Under such loading situations the described defects significantly reduce the strength. The reduction in flexural strength after machining is more severe if longitudinally oriented fibres are delaminated at the surface. On the other hand, transversal oriented top plies, which do not significantly contribute to the strength of the laminate, are not as critical as the corresponding longitudinal ones. Thus, it can be concluded that the machining caused defect sensitivity of carbon fibre reinforced plastic laminates strongly depends on their lay‐up and the loading situation.

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“…24 Therefore, the radio G(t) could be expressed as a function of drill geometry and material property. The woven CFRP used in this paper was assumed to be isotropic.…”

Section: Thrust Force With Dynamic Feed Ratementioning

confidence: 99%

Effect of workpiece stiffness on thrust force and delamination in drilling thin composite laminates

Luo

Yuan

Zhang

et al. 2015

Journal of Composite Materials

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During drilling thin composite laminates, workpiece stiffness affects drilling process through bending and release movement. A new mechanical model for thrust force prediction was developed to quantitatively describe influence of workpiece stiffness. Its effect on delamination was also investigated. Derivative of workpiece deflection caused by thrust force was calculated to obtain dynamic feed rate. Then, thrust force was predicted as a function of drill geometry, specific energy and dynamic feed rate. Experiments of drilling woven CFRP plates had been performed with different feed rate and unsupported length. Results showed that the presented model could fit measurement thrust force nicely except exit stage, in which local deformation and crack of uncut material brought forward the force drop point. Delamination damage was observed at low stiffness even though thrust force did not exceed the critical value. Analysis results indicated that dynamic feed rate was a more suitable critical parameter for delamination-free drilling.

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Comparative analysis of drills for composite laminates

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Cited by 39 publications

References 28 publications

Drilling Damage in Composite Material

Drilling Damage in Composite Material

Interaction between laminate quality, drilling‐induced delamination and mechanical properties in machining of carbon fibre reinforced plastic (CFRP)

Effect of workpiece stiffness on thrust force and delamination in drilling thin composite laminates

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