Papers by Keyword: Fiber Content

Abstract: Direct compounding of long fiber thermoplastic (LFT-D) materials in compression molding are two complex processes in series linked by the plastificate. Continuous compounding and sequential compression create a time-dependent property progression along the extrusion direction of the plastificate. Under variation of secondary parameters, extruder die temperature, and die height of the LFT-D line, samples of plastificates, flow fronts and plates are manufactured and characterized. The plastificate density progression along the extrusion direction is primarily influenced by the temperature of the die. Lofting of the plastificate is higher at high temperatures while the density difference along the extrusion direction is lower. This density difference is known to influence fiber orientations and mechanical properties. The flow front of the material filling the mold is skewed because of the density difference. We show that the skewness is mainly influenced by the die height and is lower at high die heights. The fiber content distribution in the plate is discussed and found to be influenced by the length of the plastificate which is in turn determined by the secondary parameters. These secondary parameters of the LFT-D line can play a role in process optimization once the primary parameters are selected. This work provides clues and observations of principles for such optimizations.

Abstract: The behavior of a composite material under mechanical loading condition is significantly influenced by the geometrical dimensions (length and diameter) and the total content of reinforcing fiber. Therefore, this research work focused the effect of fiber length and content on the mechanical behavior of pineapple leaf fiber (PALF) reinforced-epoxy composites. In this regard, the total of four composite samples for each fiber length (10, 15, 20, and 25 mm) and content (17, 23, 34, and 43 vol.%) were developed using a hand lay-up molding technique and characterized for mechanical properties according to ASTM standards. The tensile and flexural strength of a composite was increased with the increase of PALF length and content up to 15 mm and 34 vol.% respectively. However, the composite of 25 mm fiber length with 43% fiber volume content exhibits the maximum impact strength.

Abstract: This study evaluated the quick dry properties of summer men’s sportswear T-shirts of different brands (Nike, Adidas, Laishilong and Columbia) by studying the water vapor transmission behavior. The results indicate that Laishilong was the best sample in terms of water vapor transmission rate, whereas Columbia was the poorest. Moreover, samples of Nike, Adidas, Laishilong and Columbia, had similar water vapor transmission rate. This implies that they had comparatively similar performance in water vapor permeability.

Abstract: Composite materials continue to grow in popularity within the aerospace industry as the preferred material for manufacturing large airframe structures. However, the popularity of composite materials has also led to the increase in composite waste. As the popularity of composite materials continues to grow, the proper management and recycling of these composite waste materials becomes increasingly crucial to the sustainability of the environment. In order to investigate potential recycling techniques for composite waste, a team of Purdue University School of Aviation and Transportation Technology (SATT) faculty and students teamed up to investigate the characteristics of 3D printed recycled carbon fiber. A prototype 3D printed recycled carbon fiber part was used for the study. Through the use of microscopy and ImageJ image analyzing software, the researchers were able to determine the void content, fiber volume fraction, and fiber orientation of the prototype 3D printed recycled carbon fiber part and identified potential improvements to the 3D printing process in order to improve the 3D printed part’s characteristics.

Abstract: A flexible and individual component manufacturing process for thermoplastic composites (TPC) has been developed at the Institut fuer Kunststoffverarbeitung in Industrie und Handwerk an der RWTH Aachen (Institute of Plastics Processing (IKV) at RWTH Aachen University). The process consists of a quality controlled tape production and a combined forming and joining process with additive manufactured functional structures. This paper describes the requirements for the unidirectional (UD) tape properties and the quality controlled tape production line in order to allow for a flexible and individual component manufacturing of load optimised thermoplastic composite parts. Besides the UD tape geometry and fibre impregnation quality an even fibre distribution over the width of the UD tape is an important characteristic. Results of investigations regarding the online measured quality data (fibre distribution) and offline measured UD tape properties (local fibre weight content) are presented and discussed.

Abstract: Textiles are necessaries of human life. The fiber content is index of textile quality and how to measure it has important meaning. A method for testing fiber contents in mixture textiles by near infrared spectroscopy (NIR) was researched. The near infrared Spectra of samples in the range of 4000 cm^-1 - 10000 cm^-1 were obtained. Noise reduction and compression of spectra data was done by wavelet transform (WT). The reconstructed spectral signals were established based on WT and the correction models based on back propagation (BP) neural network were built. Comparisons between the BP neural network models at different analysis scale and the model of partial least square method (PLS) were given. When the structure of neural network is 11-9-2 for cotton/ terylene mixture samples and 21-13-2 for cotton/wool mixture samples, the best accuracy and fastest convergence speed is achieved. Experimental results have shown that this approach by Fourier transform NIR based on the BP neural network to predict the fiber content of textile mixture can satisfy the requirement of quantitative analysis and is also suitable for other fiber contents measurement of mixture textiles.

Abstract: Optically transparent nanocomposites were prepared by epoxy resin reinforced with bacterial cellulose nanofibers in volume fraction from 2.6 to 32.7wt%. The transparence, surface smoothness, thermal expansion and mechanic properties of the nanocomposites with different BC fiber content were characterized. It was found that the nanocomposites display high visible light transparence (84% at 600nm) even at high fiber content (32.7 wt%). The coefficient of planar thermal expansion (CTE) was reduced from 83.8 ppm/K (Epoxy resin) to 40.6 ppm/K at low fiber content (2.6 wt%). The high transparence was insensitive to the change of temperature from room temperature to 90 oC.

Abstract: This paper mainly studied on the effect and experiment of fiber content of plant fiber multilayer decorative board, the results show that: when the fiber content is 30% in the composite, each property can achieve better. The product has good physical and chemical properties, and environmental characteristic, it has also reached the indoor furniture use requirements and can be used to replace the ordinary artificial board,.The product is completely no harm to environment in both producing and using, and has a broad development prospect.

Abstract: To improve production efficiency and quality of fiber-glass boatyards many research have been done both through technological as well as management aspects. One of these developments is Vacuum Assisted Resin Transfer Molding (VARTM) which is claimed to have high strength and material efficiency. This method has not much been applied in Indonesian boatyards, most of them are still using conventional hand lay-up. The research is aimed to investigate the strength of the composite and the optimum amount of materials to obtain the required strength for its application on boat buildings. Experimental approach was conducted in the research using 800 biaxial and 900 unidirectional E-glass for reinforcement, and vinylester (RIPOXY R-802-EX-1) resin for the matrix. The ultimate tensile strength and Youngs modulus of the composites are obtained through tensile and flexural test based on ASTM D 3039 and ASTM D 790 standards. The data obtained are used to determine the optimum number of layers and fiber content on certain locations of the boat hull structure in order to comply with the requirements of classification rules.

Abstract: To induce the ductile behavior of ultra high performance concrete beams, the experiments to find out the best composition of volume fraction of steel fiber and ratio of reinforcement bar were carried out. 15 UHPC beams which have various combinations of volume fraction of steel fiber and ratio of reinforcement bar. The reinforcement bars was consist of 2×1, 3×3, 4×4, 5×4. The volume fractions of steel fibers were 0%, 0.7%, 1%, 1.5%, 2%. The beam which has 0% volume fraction with the close placement reinforcement bar has little effect on ductile behavior. At least 0.7% volume fraction with the close placement reinforcement bar guarantees the ductile behavior of UHPC beam.