Hole-quality evaluation in drilling fiber-reinforced composites

Hrechuk, Andrew; Bushlya, Volodymyr; Ståhl, Jan Eric

doi:10.1016/j.compstruct.2018.07.105

Cited by 65 publications

(44 citation statements)

References 18 publications

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“…The material properties of NRF are different than the material properties of the matrix material (epoxy resin) and of the reinforcing fibers (carbon), the machinability of these NRF is therefore different too. Special cutting tools for CFRP machining are usually (i) good in wear resistance against carbon fibers [53][54][55][56][57][58], (ii) excellent in minimizing delamination [59][60][61][62], furthermore, (iii) they are good in reducing the number of uncut reinforcing fibers [63][64][65][66]. Nevertheless, these special cutting tools usually do not cut properly NRF.…”

Section: Results Of Drilling Experimentsmentioning

confidence: 99%

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

Geier

Pereszlai

2019

Period. Polytech. Mech. Eng.

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Measuring and characterizing of surface roughness of machined surfaces of carbon fiber reinforced polymer (CFRP) composites are difficult due to the occurrence of special surface damages (delamination, uncut fibers, fiber pull-outs or micro-cracks, etc.). The main objective of the present study is to analyze the characteristics of surface roughness of machined unidirectional CFRP in detail. Numerous conventional drilling, helical milling, and edge trimming experiments were carried out with different cutting tools in order to analyze the influence of them on the average surface roughness (Ra), on the roughness depth (Rz) and on the Rz /Ra parameter. The surface roughness was measured by a Mitutoyo SJ-400 contact profilometer and an Alicona Infinite Focus confocal microscope. The usability of the contact profilometer was experimentally tested and compared its results with the results of the confocal microscope. Experimental results show that the contact profilometer is suitable for measuring surface roughness of CFRP, furthermore, values of Rz /Ra of drilled and edge trimmed surfaces of unidirectional CFRP are changing in a wide interval: from 5 to 14 μm/μm due to the special surface damages. Based on this research, the machinability analysis of CFRP is suggested to be extended to the analysis of the Rz /Ra parameter.

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Section: Results Of Drilling Experimentsmentioning

confidence: 99%

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

Geier

Pereszlai

2019

Period. Polytech. Mech. Eng.

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“…Delamination can affect the assembly quality and, in particular, the tolerance in subsequence operations to drilling as riveting. Thus, different approaches including both experimental and numerical methods have been employed by researchers in order to understand the damages during machining and particularly hole making [3,6,[15][16]. Drill geometry and material also have an important effect on the hole quality [3,[15][16][17].…”

mentioning

confidence: 99%

“…Thus, different approaches including both experimental and numerical methods have been employed by researchers in order to understand the damages during machining and particularly hole making [3,6,[15][16]. Drill geometry and material also have an important effect on the hole quality [3,[15][16][17]. Moreover, depending on the workpiece material structures, the delamination was analized both at the entrance as well as at the exit of the drilled hole, in the form of peel-up and push-out delamination, respectively [3,5,16].…”

mentioning

confidence: 99%

“…Drill geometry and material also have an important effect on the hole quality [3,[15][16][17]. Moreover, depending on the workpiece material structures, the delamination was analized both at the entrance as well as at the exit of the drilled hole, in the form of peel-up and push-out delamination, respectively [3,5,16].…”

mentioning

confidence: 99%

“…Regardless of the material type, unfilled polymers, glass fiber reinforced polymers or carbon fiber reinforced polymers, several modern technologies, such as digital microscop and ultrasonic C-scan techniques [17], light optical microscopy [16], scanning electron microscopy [7] or X-ray photoelectron spectroscopy (XPS) [9], non-* email: nicusor.baroiu@ugal.ro distructive methods [16] were also considered in the attempt to study the influence of parameters on the quality of the machined surfaces in dry drilling, leading to an improvement of machining process quality. In order to asses the effect of various process parameters on the machinability of polymers and polymer-based composites (thrust force, torque, surface finish, circularity of the hole, delamination factor etc.…”

mentioning

confidence: 99%

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Effect of Cutting Parameters on the Hole Quality in Dry Drilling of Some Thermoplastic Polymers

Susac¹,

Tabacaru²,

Teodor³

et al. 2019

Mat.Plast.

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Drilling of polymeric materials can be challenging when holes are produced in large scale due to the necessity of controlling the holes quality. This paper presents the effect of machining parameters on the hole quality, in terms of surface roughness and circularity error, in drilling of high density polyethylene, polyamide and polyacetale. The analysis of variance was performed in order to assess the significance of cutting parameter on the hole quality parameters. The experimental results indicate that different cutting conditions are to be employed in order to achieve the optimum surface roughness and circularity.

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Metal inserts for performance improvement in glass fiber‐reinforced polymer nanocomposite joints under accelerated aging conditions

2021

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In the present work, the accelerated aging of glass/epoxy composite bolted joints was carried out for performance evaluation. The woven glass fiber was used as reinforcement and an optimum wt% of nanoclay as filler was used to counter the accelerated aging attack. The bolted joint specimen and its testing fixture were designed as per ASTM D5961 considering width to hole diameter ratio (W/D) and edge to hole diameter ratio (E/D) as 6 and 5, respectively. The specimens were tested with and without the metal inserts. The specimens were given a cyclic exposure of 8 h of ultraviolet radiation (at 60°C) followed by 4 h of condensation (at 50°C), for a maximum of 500 h. The bolt torque of 0, 2, and 4 Nm were used for the failure analysis of the joint. The metal insert and nanoclay particles proved to be positive contributors for the performance of bolted joints under accelerated aging conditions.

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Hole-quality evaluation in drilling fiber-reinforced composites

Cited by 65 publications

References 18 publications

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

Analysis of Characteristics of Surface Roughness of Machined CFRP Composites

Effect of Cutting Parameters on the Hole Quality in Dry Drilling of Some Thermoplastic Polymers

Metal inserts for performance improvement in glass fiber‐reinforced polymer nanocomposite joints under accelerated aging conditions

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