Papers by Keyword: Tensile Modulus

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Authors: Hong Gun Kim, Young Jun Kim, Hee Jae Shin, Sun Ho Ko, Hyun Woo Kim, Young Min Kim, Yun Ju Cha, Woo Kum Lee, Lee Ku Kwac
Abstract: Al honeycomb core sandwich composite panels have different core and plate materials. The core is the Al honeycomb core, and the thin plate is GFRP sheets with fibers laminated in the 0°/90° symmetric structure. The Al honeycomb core sandwich composite panel is used for structures, which involve relatively high bending load. Before designing the structures, their stability is evaluated via the finite element analysis. In this study, an analysis method that is closest to the reality was proposed for designing the structures with Al honeycomb core sandwich composite panels. For that purpose, the modulus was reviewed. In the finite element analysis, the tensile modulus is generally used. In the results of this study, however, the tensile modulus led to significant deviations from the test results, whereas the bending modulus led to a closer value to the test results.
245
Authors: T. Molnar, V. Baranyai, S. Kemény, Gy. Bánhegyi, József Szabó
Abstract: The objective of our work is to improve the mechanical stiffness of fiber reinforced laminates. The stiffness can be characterized by flexural and tensile moduli or their derivation. We applied design of experiments (DOE) to achieve our goals, because to solve the existing analytical and numerical models is complicated.We examined the effects of the following parameters: a) composition of reinforce materials (solely carbon, or carbon and glass combination), b) modulus of resin, c) mass ratio of resin-reinforcement, d) order of layers.The samples manufactured on the basis of DOE were investigated mechanically (flexural and tensile moduli measurements) and morphologically (scanning electron microscopy). We compared the measured modulus results to calculated values.
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Authors: Dana Kremenakova, Jiří Militký, Juan Huang
Abstract: The acoustic or sonic pulse-propagation technique for the measurement of dynamic elastic modulus has the advantage of not being dependent on the sample cross-sectional characteristics. This technique also gives a direct measure of modulus rather than the indirect measure in the form of load versus extension. The sonic tests are relatively simple to apply and are nondestructive. The values of sonic modulus of fibrous structures are dependent on the orientation of components and packing density as well. The main aim of this work is to quantify effect of yarn twist on the sonic modulus of staple yarns from polypropylene fibers. The results are compared with selected models of yarn twist influence on the mechanical properties of staple yarns. The correlation between yarn orientation factor defined by Pan and sonic modulus are shown. The sonic modulus is compared with tensile modulus of yarns.
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Authors: Anna Benešová, Jan Vanerek, Rostislav Drochytka, Kateřina Havlíčková
Abstract: The aim of this paper was to evaluate the influence of cyclic weathering degradation on strength properties of wood-polymer composite modified by varying amount of fly ash filler admixture. Test specimens prepared according to EN ISO 527 were cyclic exposed to moist environment and action of frost and increased temperature. After termination of degradation process, relevant characteristics were evaluated to optimize the amount of fly ash admixture and describe its function in the structure of the composite.
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Authors: I.S. Norazian, A.R. Suraya, A. Norhafizah, T.M.T. Amran, N. Alias
Abstract: In this research, the CNT coating treatment process involves the growth of CNTs onto the surface of the carbon fibre by floating catalyst techniques using CVD. The amount of ferrocene concentration has been varied throughout this study. Different morphologies of structured CNTs through TEM instruments are discussed and the analysis study of the composition of the coated carbon fibres by the growth of CNTs using EDX is also explained. In the present study, various ferrocene concentration gives a greatest influenced to the structure of CNT growth on carbon fibre surface. Lower ferrocene concentration favoured the growth of CNTs meanwhile higher catalyst amount lead to catalyst poisoning effect which resulting lower tensile strength of the hybrid CNT-carbon fibre nanocomposite structure.
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Authors: Xu Dan Dang, Shao Jie Shi, Jun Xiao
Abstract: Through the analysis of micro-structures of Z-pin ends the basic hypothesis of elliptic configuration of the resin regions around Z-pin ends were proposed. The finite element model of the tensile modulus of X-cor sandwich was established and the finite element software ANSYS was used in the computation. The effects of Z-pin angle, diameter and density on the tensile modulus of X-cor sandwich were analyzed. Via the analysis of finite element model, the influencing trends of parameters of X-cor sandwich on the tensile modulus are achieved and the error range is ±10%. So the rationality of the proposed finite element model is verified and the finite element model can be used to forecast the tensile modulus of X-cor sandwich.
3647
Authors: Martin Bednarik, Adam Skrobak, Vaclav Janostik
Abstract: This study deals with the effect of high doses of ionizing beta radiation (132, 165 and 198 kGy) on mechanical properties (tensile strength, tensile modulus and elongation) of low and high density polyethylene under thermal loading. The measurement results of this study indicate that with an increasing dose of radiation grows tensile strength and modulus of low and high density polyethylene. For all examined materials were also observed changes in elongation.
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Authors: Yassir A. Eltahir, Haroon A.M. Saeed, Yu Min Xia, Yi Min Wang
Abstract: Polyamide 5,6 (PA56) fibers were successfully prepared by melt-spinning technique. PA56 fibers were subjected to hot drawing process at different draw ratio and temperature. The effect of the drawing conditions on their mechanical properties such as tenacity, tensile modulus and breaking elongation were investigated by means of tensile test measurements. The results revealed that the tenacity and tensile modulus were found to be increased, while the elongation at break decreased with the draw ratio. The improvements of the mechanical properties could be attributed to the enhanced of the molecular orientation along the fiber axis and an increase in crystallinity. On the other hand, the PA56 fibers mechanical properties do not show significant difference with the drawing temperatures.
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Authors: Reymark D. Maalihan, Bryan B. Pajarito
Abstract: Polyethylene (PE) films with pro-oxidants are commonly used in agricultural and packaging industries due to their inherent biodegradability when initially expose to heat and/or light in the presence of oxygen. The degradation of films is characterized by formation of oxidation products, weight changes and loss of mechanical properties. This study investigated the relationship between tensile modulus and oxygen uptake of low-density PE films with pro-oxidants under thermal treatment at 50 and 70 °C. Blown-type films of varying colorants, thickness and pro-oxidant loading were formulated according to Taguchi design of experiments. Tensile modulus and oxygen uptake of thermally aged films were obtained from force-stroke curves and gravimetric tests, respectively. Results revealed that two out of nine formulated films showed tensile modulus to be significantly increasing with oxygen uptake at 50 °C. Correlation was more evident at 70 °C where seven out of nine formulations followed the same trend. The improvement in tensile modulus with oxygen uptake indicates increase in crystallinity of films during thermal aging. Increase in hydroxyl index of films with exposure time confirmed their degradation during heat aging. Consequently, concentration of carboxylic acids as major thermo-oxidation products was found higher at 70 °C of aging.
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Authors: Xing Kai Chen
Abstract: In the present investigation, carbon nanofibers (CNF) were dispersed in epoxy matrix to form CNF/glass fiber/epoxy composites. Before blending, CNF was oxidated to get more functional groups on CNF and improve the interface combination between resin and CNF, the infrared spectrum was used to test the efficiency. After that, tensile modulus tests were carried on for CNF/glass fiber/epoxy composites with different CNF fractions, the results indicated that there were slight improvements of tensile modulus when adding CNF. At 3.0 wt% of CNF, composites have the high improvement of tensile modulus, but the reinforcement of CNF decreased at 5.0 wt% of CNF. And the CNF reinforcement efficiency was analyzed using modified Coxs model and rule of mixture.
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