New Measurement Processes to Define the Quality of Machined Fibre Reinforced Polymers

Zemann, Richard; Sacherl, Josef; Hake, Wolfgang; Bleicher, Friedrich

doi:10.1016/j.proeng.2015.01.415

Cited by 20 publications

(9 citation statements)

References 3 publications

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“…Besides, resins are easier to fracture than fibers and the adhesive strength between resins and fibers are relatively lower compared with the fracture strength of the reinforcing fibers [14]. Hence, mechanical defects, such as tearing, spalling, delamination and fiber pullout are more likely to occur during the drilling process [15]. To address the aforementioned machining defects, a large number of analytical and numerical models have been developed by achieving some favorable results.…”

Section: Introductionmentioning

confidence: 99%

A Study on Drilling High-Strength CFRP Laminates: Frictional Heat and Cutting Temperature

Dang

et al. 2018

Materials

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High-strength carbon fiber reinforced polymer (CFRP) composites have become popular materials to be utilized in the aerospace and automotive industries, due to their unique and superior mechanical properties. An understanding of cutting temperatures is rather important when dealing with high-strength CFRPs, since machining defects are likely to occur because of high temperatures (especially in the semi-closed drilling process). The friction behavior at the flank tool-workpiece interface when drilling CFRPs plays a vital role in the heat generation, which still remains poorly understood. The aim of this paper is to address the friction-induced heat based on two specially-designed tribometers to simulate different sliding velocities, similar to those occurring along the flank tool-work interface in drilling. The elastic recovery effect during the drilling process was considered during the tribo-drilling experiments. The drilling temperatures were calculated by the analytical model and verified by the in-situ experimental results gained using the embedded thermocouples into the drills. The results indicate that the magnitudes of the interfacial friction coefficients between the cemented carbide tool and the CFRP specimen are within the range between 0.135–0.168 under the examined conditions. Additionally, the friction caused by the plastic deformation and elastic recovery effects plays a dominant role when the sliding velocity increases. The findings in this paper point out the impact of the friction-induced heat and cutting parameters on the overall drilling temperature.

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Section: Introductionmentioning

confidence: 99%

A Study on Drilling High-Strength CFRP Laminates: Frictional Heat and Cutting Temperature

Dang

et al. 2018

Materials

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“…189 Therefore, during the drilling process, damages such as burrs, delaminations, breakage of the matrix, and breakage of the matrix generally happen. 190 In industrial applications, the damage caused during processing is of major importance. Figure 21 shows the delamination during drilling process.…”

Section: Challenges In Machining Of Nfrcsmentioning

confidence: 99%

Challenges on machining characteristics of natural fiber-reinforced composites – A review

Raj

Dhas

Jesuthanam

2020

Journal of Reinforced Plastics and Composites

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The emerging “green” economy is based on energy efficiency, renewable food stocks in polymeric products, industrial processes that reduce carbon emissions, and recyclable materials. Natural fiber is a type of renewable source and a new generation of reinforcements and integrators for polymer-based materials. Because of its advantages over synthetic fibers, the use of natural fibers as reinforcements in composite materials has become important in recent years. To meet certain design criteria, natural fiber-reinforced composites impose certain secondary operations during assembly. Limited literature is available only in connection with the processing of natural fiber-reinforced composites. This paper analyzes a comprehensive review of the natural fiber-reinforced composite processing literature along with the challenges during processing.

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“…Thus delamination, fraying and splintering were analysed in detail. The measuring process, according to [28,29], starts with the evaluation of delamination (d), fraying (f) and splintering (s) caused by drilling. The maximum lengths of the occurring damages (f max , d max , s max ) were measured optically (cf.…”

Section: Hole Quality Evaluationmentioning

confidence: 99%

“…The maximum length of the damage is divided by a previously defined critical damage length, which was specified as the diameter D 0 of the drilled hole [29].…”

Section: Hole Quality Evaluationmentioning

confidence: 99%

“…(3), which is the average of the three single damage values. [29] The possible range of the quality indices is between 0% (no measurable damage) and 100% (maximum damage length equals the critical damage length D 0 ). In order to evaluate the influence of VAD on the damage mechanisms in CFRP drilling tests using a cutting speed of v c = 80 m/ min and a feed of f = 0.1 mm/rev were conducted.…”

Section: Hole Quality Evaluationmentioning

confidence: 99%

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Vibration assisted drilling of CFRP/metal stacks at low frequencies and high amplitudes

Bleicher

Wiesinger

Kumpf

et al. 2018

Prod. Eng. Res. Devel.

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In many applications of automotive and aircraft industries the use of material combinations such as compound materials made from carbon fiber reinforced plastics (CFRP) and metal materials like steel, titanium or aluminum alloys is significantly increasing. For these industries, the lightweight and mechanical properties of the reinforced plastic materials gain more and more importance. When machining material combinations, a number of distinctive material related effects occur and hamper the straight-forward implementation of machining processes. These effects mainly derive from the distinctive chipping behavior of the material combination caused by the different material characteristics. Thus, the drilling process of CFRP/metal stacks is to be regarded as a challenging task due to the requirements of machining efficiency and quality aspects. In this regard, vibration assisted drilling at low frequencies but high amplitudes opens up significant opportunities for improvements of the machining processes. The feed rate is superimposed by a controlled harmonic motion in order to create an intermittent cutting state. The potential of vibration assisted drilling lies in the reduction of cutting forces and tool wear.

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New Measurement Processes to Define the Quality of Machined Fibre Reinforced Polymers

Cited by 20 publications

References 3 publications

A Study on Drilling High-Strength CFRP Laminates: Frictional Heat and Cutting Temperature

A Study on Drilling High-Strength CFRP Laminates: Frictional Heat and Cutting Temperature

Challenges on machining characteristics of natural fiber-reinforced composites – A review

Vibration assisted drilling of CFRP/metal stacks at low frequencies and high amplitudes

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