Tensile Strength and Fracture Behaviors of Complex GFRP Composites with a                 Central Hole

Yao, Xuefeng; Bijlaard, F.S.K.; Kolstein, M.H.; Yeh, Hsien-Yang

doi:10.1177/0021998305049054

Cited by 14 publications

(9 citation statements)

References 15 publications

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“…[1][2][3][4] Glass fiber reinforced plastic (GFRP) is an advanced epoxy matrix-based composite material, which is widely used in aerospace industries for making aircrafts, satellites, rockets, and missiles due to its insulating properties and dimensional stability at high-temperature working environments. [5][6][7][8] Machining of the FRPs has been a challenging task, which is very different from machining of metals and alloys due to their anisotropic orientation of fibers, heterogeneous material properties, low thermal conductivity as well as heat sensitivity. Due to its extensive use, the machining of GFRP has become very important; in this connection, different processes are required to be explored to impart high cutting speed, good dimensional accuracy, high surface quality at the cutting zone, and less alteration of mechanical properties of the base material.…”

Section: Introductionmentioning

confidence: 99%

Fiber laser processing of GFRP composites and multi-objective optimization of the process using response surface methodology

Sethi

Das

2018

Journal of Composite Materials

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In the present investigation, a continuous wave fiber laser with maximum power of 400 W was used to cut a glass fiber reinforced plastic sheet of 4.56 mm thickness using Nitrogen as assisting gas. The influence processing parameters such as laser irradiance, gas pressure, and cutting speed on the cut surface quality were investigated by using response surface methodology. The different responses of laser cut surface such as upper kerf width, taper percentage along the cut depth, and heat-affected zone on the top surface were measured to analyze the influence of input process parameters on the responses. A statistical analysis on the obtained results was conducted and found that the optimum values of different input process parameters were laser irradiance: 8.28 × 105 watt/cm2, cutting speed: 600 mm/min and assisting gas pressure: 7.84 bar. The corresponding values of responses were upper kerf width: 177.4 µm, taper 0.73%, and heat-affected zone on top surface: 109.23 µm. The confirmation experiments were conducted with the obtained optimum parameter setting and observed that the predicted values and experimental values for upper kerf width, taper percentage and top surface heat-affected zone were within the error limits of 2.52%, 1.84%, and 0.45%, respectively. Furthermore, damages like loose fibers, interlayer fractures, evaporation of matrix material and fiber breakages were observed.

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Section: Introductionmentioning

confidence: 99%

Fiber laser processing of GFRP composites and multi-objective optimization of the process using response surface methodology

Sethi

Das

2018

Journal of Composite Materials

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“…Glass-bre reinforced unsaturated polyester (GFRUP) is one of the speci cally appropriate composite thermoset polymers for particularly technical applications due to their non-melting, high thermal and chemical resistance, stiffness, surface hardness, dimensional stability and low ammability [1]. Due to these extraordinary mechanical properties, this composite is vastly applied for manufacturing various parts in aerospace industries, ship, submarine, train and automotive [1,2]. Basically, the glass-bre-reinforced polymer is a composite manufactured combining two phases namely a polymer matrix and a ne GF network scattered into it.…”

Section: Introductionmentioning

confidence: 99%

CO2 laser cutting of glass-fibre-reinforced unsaturated polyester (GFRUP): an experimental investigation

Rejani

Hashemzadeh

2021

Preprint

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Glass-fibre reinforced unsaturated polyester (GFRUP) is one the thermoset composites that has many applications in manufacturing productions. CO2 laser cutting of this composite has been significantly developed in industries. It is believed that the presence of glass fibre network in the matrix of thermoset affect the laser cutting process of this composite. In addition, the three-dimensional matrix of monomers along with carbon atoms in the atomic network's joints can also influence the laser cutting parameters. The aim of this research is to experimentally investigate the effect of these complicated structural properties on the CO2 laser cutting of GFRUP sheets. First, the maximum cutting speeds, in which the cut occurs, was obtained for various sheet thicknesses using a variety of powers. The kerf width was measured with using an optical stereo-microscope. Then, the laser cutting mechanism was discussed using the SEM of the cut edge surfaces. The volume cutting efficiency was also studied. The results indicate that the upper kerf width is wider than the lower kerf width. The upper kerf width is larger than the spot size of 0.3 mm. The chaotic striations on the cut edge surface are the re-solidified glass fibres and can be seen as something like stalactites which are in black due to the carbon dust. Opening of the lower kerf due to the shrinkage of the re-solidified glass fibre is reported as a phenomenon. The cutting efficiency decreases as sheet thickness increases.

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“…However, bolted connections require the laminates to be circularly notched, which causes serious stress concentrations. 5,6 And the uneven bolt load distribution in multi-bolt joints increases local stress in composite material, which then tends to fail in lower bearing strength. 7 Moreover, multi-bolt joints can easily fail in catastrophic net-tension failure mode, since this cannot be avoided by simple design of geometry and laminate layup of joints, and instead requires a complex optimization based on a failure-prediction method.…”

Section: Introductionmentioning

confidence: 99%

Coupled continuum damage mechanics and failure envelope method for failure prediction of composite multi-bolt joints

2016

Journal of Reinforced Plastics and Composites

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A numerical strategy, based on continuum damage mechanics and the failure envelope method, is proposed for failure prediction of composite multi-bolt joints. First, the design parameters of the failure envelope are determined by virtual tests of simple structures. Then, a modified failure envelope incorporating the bending effect is constructed. Finally, different bearing-to-bypass stress ratios and the influence of bolt rows on the bending effect are discussed. It is shown that the failure envelope with constant bearing-to-bypass stress ratio, obtained by assuming uniform bolt load distribution, is recommended. And the bending effect of single-lap, composite multi-bolt joints is alleviated by the introduction of more bolt rows. These results indicate that failure prediction of composite multi-bolt joints, using the proposed numerical strategy, exhibits excellent agreement with the experimental outcomes. This demonstrates that the numerical strategy is feasible.

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Tensile Strength and Fracture Behaviors of Complex GFRP Composites with a Central Hole

Cited by 14 publications

References 15 publications

Fiber laser processing of GFRP composites and multi-objective optimization of the process using response surface methodology

Fiber laser processing of GFRP composites and multi-objective optimization of the process using response surface methodology

CO2 laser cutting of glass-fibre-reinforced unsaturated polyester (GFRUP): an experimental investigation

Coupled continuum damage mechanics and failure envelope method for failure prediction of composite multi-bolt joints

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