An analytical delamination model of drilling aramid fiber–reinforced plastics by brad drill

Liu, Sinan; Yang, Tiantian; Liu, Chang; Jin, Yan; Sun, Dan; Shen, Yongjun

doi:10.1007/s00170-020-05628-9

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…Delamination can compromise the structural integrity of the material by causing the separation or cracking of layers around a drilled hole. [42][43][44] Therefore, calculating the delamination factor is of utmost importance to maintain the material's integrity and minimize potential damages. The calculation involves determining the difference between the actual hole diameter and the diameter of the delaminated area around the hole.…”

Section: Delamination and Burr Formationmentioning

confidence: 99%

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

Yarar

2023

Journal of Composite Materials

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This article presents a comprehensive experimental investigation into the drilling behavior of Nomex®, a type of aramid fiber. The study specifically examines the impact of various cutting parameters and drill bit types on drilling outcomes. While Nomex® offers many advantages, difficult chip evacuation during drilling of aramid fiber composites can lead to surface defects and delamination. The research aims to explore how drilling parameters—such as spindle speed, feed rate—and four distinct drill bit types affect drilling performance. The analysis encompasses factors such as thrust force, torque, and surface roughness, studied under different drilling conditions and with various drill bit types. Moreover, the research assesses peeling and push-out delamination factors to gain insights into drill bit and coating characteristics. An examination of burr and chipping further enhances the comprehension of drilling performance. To determine the most effective drilling conditions, the study employs multi-response optimization. The optimal drilling performance is achieved with a combination of a 0.1 mm/rev feed rate, 1402.82 r/min spindle speed, and HSS-TiN drill type. This configuration successfully integrates responses, resulting in a composite desirability value of 0.95.

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Section: Delamination and Burr Formationmentioning

confidence: 99%

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

Yarar

2023

Journal of Composite Materials

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“…Jongvivatsakul, et.al [16] studied how the physical properties of aramid fibre-reinforced concrete is influenced by length and shape of fibre. Sinan Liu, et.al [17] introduced two delamination mechanisms in drilling of AFRP according to actual tool/ material mating conditions, and called them hole wall delamination/ hole exit delamination. Malleswararao et.al [18] investigated the effect of varying process parameters such as tool rotational speed, weld speed, and tool tilt angle on the metallurgical behaviour and particle distribution and their influence on the mechanical properties, viz., ultimate tensile strength and tensile elongation.…”

Section: Introductionmentioning

confidence: 99%

Analysis Of Delamination During Drilling Process Of Aramid Fibre Reinforced Polymers

Durga Prasada Rao,

Mahaboob Ali,

Ali

et al. 2024

J. Phys.: Conf. Ser.

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Aramid Fibre Reinforced Polymer (AFRP) is a modern engineering material which is highly versatile in nature. These materials are usually used to produce impact resistant structures. Aramids have high modulus, tensile strength, stiffness, and low weight density. AFRP, under cyclic loading, shows good performance. As far as textiles and concrete structures are considered, AFRP is one of the best fiber-reinforced composites. Delamination is a failure mode that causes fracture of a variety of materials including concrete and laminate composites. A material, in general, fractures into layers due to delamination effect, i.e., separation into its constituent layers. In the present study, the AFRP polymer is prepared by hand layup method, drilling operation is done on the composite under different machining conditions, measurements regarding delamination are taken using a tool room microscope, and delamination factor is calculated by using a suitable equation. Rate of feed, spindle speed and diameter of drill are the drilling parameters under consideration. Each of these parameters are considered at three different levels. A fully crossed design consisting of 27 tests is considered to conduct experiments. The results of different experiments are analyzed statistically using Fisher variance analysis (ANOVA) to determine the impact of variables of drilling on the delamination factor. The main effects plots disclose that the lowest delamination factor is obtained for a rate of feed of 0.4 mm/rev, a speed of spindle of 1000 rpm and for a drill diameter of 15 mm. It is also noted that the delamination factor increases as the speed of spindle and diameter decreases. The interaction plot of rate of feed-spindle speed indicates that the interaction has moderate effect on delamination factor, whereas interaction plot of rate of feed-diameter represents that the rate of feed on delamination factor banks on level of drill diameter, and interaction plot of speed of spindle speed-diameter of drill demonstrates that the interaction has moderate impact on delamination factor. Also, regression analysis is done to establish the general linear model relating delamination factor and the drilling parameters under consideration.

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“…Feito et al [ 39 ] predicted the damage induced during the drilling of composite materials using multi-objective optimization analysis of cutting parameters for special geometry drills. Liu et al [ 40 , 41 ] presented a delamination model based on superposition of linear fracture mechanics capable of predicting a critical thrust force of aramid fiber-reinforced plastics by a brad drill. Wang and Jia [ 42 ] performed a full factorial experiment and utilized an artificial neural network for drilling CFRP with different drilling parameters to express the thrust force and delamination factor as a function of drilling parameters.…”

Section: Introductionmentioning

confidence: 99%

Heat-Affected Zone and Mechanical Analysis of GFRP Composites with Different Thicknesses in Drilling Processes

et al. 2021

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This article presents a comprehensive thermomechanical analysis and failure assessment in the drilling of glass fiber-reinforced polymer (GFRP) composites with different thicknesses using a CNC machine and cemented carbide drill with a diameter of 6 mm and point angles of ϕ = 118°. The temperature distribution through drilling was measured using two techniques. The first technique was based on contactless measurements using an IR Fluke camera. The second was based on contact measurements using two thermocouples inserted inside the drill bit. A Kistler dynamometer was used to measure the cutting forces. The delamination factors at the hole exit and hole entry were quantified by using the image processing technique. Multi-variable regression analysis and surface plots were performed to illustrate the significant coefficients and contribution of the machining variables (i.e., feed, speed, and laminate thickness) on machinability parameters (i.e., the thrust force, torque, temperatures, and delamination). It is concluded that the cutting time, as a function of machining variables, has significant control over the induced temperature and, thus, the force, torque, and delamination factor in drilling GFRP composites. The maximum temperature recorded by the IR camera is lower than that of the instrumented drill because the IR camera cannot directly measure the tool–work interaction zone during the drilling process. At the same cutting condition, it is observed that by increasing the thickness of the specimen, the temperature increased. Increasing the thickness from 2.6 to 7.7 had a significant effect on the heat distribution of the HAZ. At a smaller thickness, increasing the cutting speed from 400 to 1600 rpm decreased the maximum thrust force by 15%. The push-out delaminations of the GFRP laminate were accompanied by edge chipping, spalling, and uncut fibers, which were higher than those of the peel-up delaminations.

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An analytical delamination model of drilling aramid fiber–reinforced plastics by brad drill

Cited by 9 publications

References 32 publications

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

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

Analysis Of Delamination During Drilling Process Of Aramid Fibre Reinforced Polymers

Heat-Affected Zone and Mechanical Analysis of GFRP Composites with Different Thicknesses in Drilling Processes

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