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Статті в журналах з теми "Pa66/gf30"

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Автор: Grafiati

Опубліковано: 14 квітня 2023

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1

Wang, Haipeng, Yang Chen, Zaoyang Guo, and Yingchun Guan. "Porosity Elimination in Modified Direct Laser Joining of Ti6Al4V and Thermoplastics Composites." Applied Sciences 9, no. 3 (January 26, 2019): 411. http://dx.doi.org/10.3390/app9030411.

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Анотація:

Hybrid lightweight components with strong and reliable bonding qualities are necessary for practical applications including in the automotive and aerospace industries. The direct laser joining method has been used to produce hybrid joints of Ti6Al4V and glass fiber reinforced polyamide (PA66-GF30). Prior to the laser joining process, a surface texturing treatment is carried out on Ti6Al4V to improve joint strength through the formation of interlock structures between Ti6Al4V and PA66-GF30. In order to reduce the generated micro-pores in Ti6Al4V-PA66-GF30 joints, a modified laser joining method has been proposed. Results show that only very few small micro-pores are generated in the joints produced by the modified laser joining method, and the fracture strength of the joints is significantly increased from 13.8 MPa to 41.5 MPa due to the elimination of micro-pores in the joints.

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2

Mata, Francisco, Pedro Reis, and J. Paulo Davim. "Physical Cutting Model of Polyamide Composites (PA66 GF30)." Materials Science Forum 514-516 (May 2006): 643–47. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.643.

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Polymeric matrix composite materials presents advantages in a great number of applications due to their high specific strength and stiffness, wear resistance, dimensional stability, low weight and directional properties. As result of these properties and potentials applications exists a strong need to understand the manufacturing processes, particularly the machining process of these composite materials. This paper presents an investigation above the modelization of the cut, turning of small workpieces, on two materials: a polymer PA 6 (Polyamide) and a composite PA 66-GF30 (reinforced with 30% of glass fiber). The tests were carried out polycrystalline diamond tools (PCD). The objective of this experimental study is to evaluate the influence of the glass fiber reinforcement on the friction angle (ρ), shear angle (Φ), normal and shear stresses (σ, τ), chip deformation (ε) under the cutting parameters prefixed (cutting velocity and feed rate). The experimental model was compared with the theoretical model of Merchant.

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3

Spina, Roberto, and Bruno Cavalcante. "Evaluation of Grinding of Unfilled and Glass Fiber Reinforced Polyamide 6,6." Polymers 12, no. 10 (October 6, 2020): 2288. http://dx.doi.org/10.3390/polym12102288.

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This paper investigates the grinding process on unreinforced (PA66) and reinforced glass-fiber polyamide 6,6 (PA66 GF30) with Al2O3 and SiC abrasive wheels. Both materials were ground by varying rotations, workpiece infeed speed, depth of cuts for sequential roughing/finishing steps. Dry and liquid coolant conditions were also considered during the grinding process to evaluate the effects on part quality. The surface roughness was used to assess the quality of the final products with several parameter combinations, identifying the induced process trends. The results show that at the end of the finishing step, the surface roughness Rz was lower than 4 μm, attaining the lowest value of 1.34 μm for PA66 specimens. The analysis also suggested the choice of the Al2O3 grinding wheel to reach the lowest Rz values for both materials.

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4

Konczal, Natalia, Piotr Czyżewski, and Bartosz Nowinka. "Numerical analysis of chemically foamed thick-walled PA66 GF30 moldings." MATEC Web of Conferences 351 (2021): 01018. http://dx.doi.org/10.1051/matecconf/202135101018.

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The paper presents a numerical analysis of thick-walled PA66 GF30 moldings with the addition of a chemical blowing agent with a content of 1-3 wt%, and the obtained results were compared with the real object. Computer simulations were performed using Moldex3D® software. Based on the numerical analysis, it was found that regardless of the dose of the blowing agent used, the largest pores were place in the core of the sample. Moreover, it was found that the size of the pores depends on their number in the cross-section of moldings. Compositions containing a higher cross-sectional pore density were characterized by smaller pore sizes. The results of the computer simulation also showed that increasing the blowing agent dose above 2 wt% does not significantly affect the size of the pores in the structure. The experimentally determined pore size of the composition containing 3 wt% chemical blowing agent slightly differs from the pore size obtained based on numerical analysis.

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5

Silva, Leonardo R., J. Paulo Davim, António Festas, and A. M. Abrão. "Machinability aspects concerning micro-turning of PA66-GF30-reinforced polyamide." International Journal of Advanced Manufacturing Technology 41, no. 9-10 (June 3, 2008): 839–45. http://dx.doi.org/10.1007/s00170-008-1537-y.

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6

Gaitonde, V. N., S. R. Karnik, L. R. Silva, A. M. Abrão, and J. P. Davim. "Machinability Study in MicroTurning of PA66 GF30 Polyamide with a PCD Tool." Materials and Manufacturing Processes 24, no. 12 (December 21, 2009): 1290–96. http://dx.doi.org/10.1080/10426910903130115.

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7

Cofaru, Nicolae, Lucian Roman, Adrian Pascu, and Valentin Oleksik. "Experimental Study Regarding of Bending Behaviour of Stabilizator Link." ACTA Universitatis Cibiniensis 68, no. 1 (December 1, 2016): 12–15. http://dx.doi.org/10.1515/aucts-2016-0003.

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Abstract This paper presents an experimental study of the behavior of anti-roll power link subjected to bending, power link coming from an Opel Astra G. The power link is made of PA66 GF30 polyamide. For this study, there were used a universal testing machine (Instron 5587) and a real-time strain measurement optical system (Aramis). The results showed are those obtained in the case of a compression force of 1,000 [N] namely: major Strain ε1, minor strain ε2, equivalent von Mises strain, displacement on X axis, displacement on Y axis (compression force direction), displacement on Z axis.

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8

Arif, M. F., F. Meraghni, Y. Chemisky, N. Despringre, and G. Robert. "In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity." Composites Part B: Engineering 58 (March 2014): 487–95. http://dx.doi.org/10.1016/j.compositesb.2013.11.001.

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9

Lee, Chang Soon, Hee Jun Kim, Auezhan Amanov, Jeong Hwan Choo, Yong Kap Kim, and In Sik Cho. "Investigation on very high cycle fatigue of PA66-GF30 GFRP based on fiber orientation." Composites Science and Technology 180 (August 2019): 94–100. http://dx.doi.org/10.1016/j.compscitech.2019.05.021.

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10

Sykutera, Dariusz, Piotr Czyżewski, and Piotr Szewczykowski. "High-Performance of a Thick-Walled Polyamide Composite Produced by Microcellular Injection Molding." Materials 14, no. 15 (July 27, 2021): 4199. http://dx.doi.org/10.3390/ma14154199.

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Анотація:

Lightweight moldings obtained by microcellular injection molding (MIM) are of great significance for saving materials and reducing energy consumption. For thick-walled parts, the standard injection molding process brings some defects, including a sink mark, warpage, and high shrinkage. Polyamide 66 (PA66)/glass fiber (GF) thick-walled moldings were prepared by MuCell® technology. The influences of moldings thickness (6 and 8.4 mm) and applied nitrogen pressure (16 and 20 MPa) on the morphology and mechanical properties were studied. Finally, the microcellular structure with a small cell diameter of about 30 μm was confirmed. Despite a significant time reduction of the holding phase (to 0.3 s), high-performance PA66 GF30 foamed moldings without sink marks and warpage were obtained. The excellent strength properties and favorable impact resistance while reducing the weight of thick-walled moldings were achieved. The main reason for the good results of polyamide composite was the orientation of the fibers in the flow direction and the large number of small nitrogen cells in the core and transition zone. The structure gradient was analysed and confirmed with scanning electron microscopy (SEM) images, X-ray micro computed tomography (micro CT) and finite element method (FEM) simulation.

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11

Zhang, Longhui, David Townsend, Nik Petrinic, and Antonio Pellegrino. "Temperature dependent dynamic compressive response of PA66-GF30 composite under constant strain rate multiaxial loading." Composites Part B: Engineering 234 (April 2022): 109738. http://dx.doi.org/10.1016/j.compositesb.2022.109738.

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12

Astrouski, Ilya, Tereza Kudelova, Josef Kalivoda, and Miroslav Raudensky. "Shear Strength of Adhesive Bonding of Plastics Intended for High Temperature Plastic Radiators." Processes 10, no. 5 (April 20, 2022): 806. http://dx.doi.org/10.3390/pr10050806.

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Анотація:

The use of adhesive joints has increased in recent decades due to their competitive features in comparison with other joining methods. They can be used in specific applications where there is no possibility to use alternative connection techniques. Adhesive bonding was used to assemble the prototype of a high-temperature car radiator (operated up to 125 °C) with a total of 12,240 plastic tubes. This work aims to estimate the shear strength of different adhesives intended for bonding the plastics used to assemble the above-mentioned high-temperature radiator. Fourteen commercial adhesives were tested with one thermoset plastic (G11 glass fabric epoxy sheets) and two glass-reinforced thermoplastics (polyamide PA66-GF30 and polyphenylene sulfide PPS-GF40). Tests were conducted according EN 1465 to determine tensile lap-shear strength of bonding. Testing showed that only 4 of the 14 adhesives tested exhibit substantial bonding strength at temperatures above 120 °C and only one is resistant at 180 °C. The AS60/AW60 adhesive showed the best results for all three substrates: 1.6 MPa for epoxy sheets and PA66-GF, and 1.4 MPa for PPS-GF40. Additionally, the influence of the surface treatment with cold plasma was evaluated on a clean and activated bonding surface, causing a 30% increase in the shear strength.

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13

Gaitonde, V. N., S. R. Karnik, Francisco Mata, and J. Paulo Davim. "Modeling and Analysis of Machinability Characteristics in PA6 and PA66 GF30 Polyamides through Artificial Neural Network." Journal of Thermoplastic Composite Materials 23, no. 3 (September 29, 2009): 313–36. http://dx.doi.org/10.1177/0892705709349319.

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14

Gaitonde, V. N., S. R. Karnik, Francisco Mata, and J. Paulo Davim. "Machinability study in turning of unreinforced (PA6) and reinforced (PA66 GF30) polyamides with Polycrystalline Diamond (PCD) tools." International Journal of Materials and Product Technology 37, no. 1/2 (2010): 140. http://dx.doi.org/10.1504/ijmpt.2010.029465.

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15

Gutiérrez, Juan Carlos Horta, Juan Carlos Campos Rubio, Paulo Eustáquio de Faria, and João Paulo Davim. "Usinabilidade de materiais compósitos poliméricos para aplicações automotivas." Polímeros 24, no. 6 (December 2014): 711–19. http://dx.doi.org/10.1590/0104-1428.1582.

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Анотація:

A cada dia o avanço tecnológico nos leva a encruzilhadas como a construção de veículos mais leves, com menor consumo de combustível e mais seguros. Neste sentido, materiais compósitos poliméricos são materiais usados atualmente em diferentes aplicações nas quais a leveza combinada com um alto módulo de elasticidade são características importantes. Poliamidas reforçadas com fibras de vidro se apresentam como materiais de grande futuro em aplicações automotivas. Desta forma, torna-se importante o estudo do comportamento deste tipo de material quando submetidos a processos de usinagem. Dentre os processos de usinagem o processo de furação é um dos mais utilizados nos componentes de material compósito. Neste trabalho será analisada a influência do avanço, da velocidade de corte e da geometria da ferramenta na força de avanço, pressão específica de corte e desvios dimensionais do furo realizado. Os testes foram realizados em poliamida sem reforço (PA6) e reforçada com 30% fibra de vidro (PA66-GF30) utilizando brocas de carbonetos sinterizados (K20) com ângulos de ponta diferente. Os resultados apontam claramente para a melhor usinabilidade do material reforçado em comparação ao sem reforço.

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16

Sykutera, Dariusz, Piotr Czyżewski, and Piotr Szewczykowski. "The Microcellular Structure of Injection Molded Thick-Walled Parts as Observed by In-Line Monitoring." Materials 13, no. 23 (November 30, 2020): 5464. http://dx.doi.org/10.3390/ma13235464.

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Анотація:

The aim of the study was to detect the influence of nitrogen pressure on the rheological properties and structure of PA66 GF30 thick-walled parts, produced by means of microcellular injection molding (MIM), using the MuCell® technology. The process was monitored in-line with pressure and temperature sensors assembled in the original injection mold. The measured data was subsequently used to evaluate rheological properties inside an 8.4 mm depth mold cavity. The analysis of the microcellular structure was related to the monitored in-line pressure and temperature changes during the injection process cycle. A four-times reduction of the maximum filling pressure in the mold cavity for MIM was found. At the same time, the holding pressure was taken over by expanding cells. The gradient effect of the cells distribution and the fiber arrangement in the flow direction were observed. A slight influence of nitrogen pressure on the cells size was found. Cells with a diameter lower than 20 µm dominate in the analyzed cases. An effect of reduction of the average cells size in the function of distance to the gate was observed. The creation of structure gradient and changes of cells dimensions were evaluated by SEM images and confirmed with the micro CT analysis.

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17

Campos Rubio, J., T. H. Panzera, A. M. Abrao, Paulo E. Faria, and J. Paulo Davim. "Effects of high speed in the drilling of glass whisker-reinforced polyamide composites (PA66 GF30): statistical analysis of the roughness parameters." Journal of Composite Materials 45, no. 13 (November 12, 2010): 1395–402. http://dx.doi.org/10.1177/0021998310381540.

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18

"BASF introduces new color-stable polyamide for electromobility, and new flame-retardant polyphthalamides." Additives for Polymers 2022, no. 5 (May 1, 2022). http://dx.doi.org/10.12968/s0306-3747(22)70089-9.

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19

Haoues, Sabrina, Mohamed Athmane Yallese, Salim Belhadi, Salim Chihaoui, and Alper Uysal. "Modeling and optimization in turning of PA66-GF30% and PA66 using multi-criteria decision-making (PSI, MABAC, and MAIRCA) methods: a comparative study." International Journal of Advanced Manufacturing Technology, December 13, 2022. http://dx.doi.org/10.1007/s00170-022-10583-8.

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