Papers by Keyword: Modulus

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Authors: Meshal Al-Samhan, A. Yussuf, S. Jacob
Abstract: Fiber reinforced composite material is used widely in oil fields for its high specific strength and resistance to corrosion. Glass reinforced plastics (GRP) and Glass reinforced epoxy (GRE) pipe samples were investigated under oil field conditions. The samples were subjected to ultraviolet radiation, moisture and elevated temperature using accelerating weathering machine and then aged in different environments encountered in oil well streams and characterized by using Scanning Electron Microscopy (SEM). The surface morphology was analyzed and the images produced from wet crude and effluent water has shown different degree of deformation of the glass fiber and debonding with the polymer matrix. The tensile and modulus properties were also evaluated and effect of ageing found to be more pronounced in the case of wet crude especially for the GRE. The study revealed some tendency of GRP samples to reform the polymer matrix interface with the glass fiber after weathering. The assessment of physical properties provided information about the structural stability of composite pipes under harsh environments, which in turn can impact their overall performance and service life.
Authors: Dong Ming Qi, Rui Zhang, Jie Xu, Xing Cong Shen, Koh Hei Nitta
Abstract: A novel phenolic rigid organic filler (named K3) was dispersed in isotactic polypropylene matrix (iPP) by melt-mixing process, and a series of K3/iPP blends was prepared with or without maleic anhydride-grafted polypropylene (MAPP) as compatibilizer. The influences of K3 and MAPP on the filler dispersion were studied using Polarized Optical Microscope (POM) and Fourier Transform Infrared Spectroscopy (FTIR). The influences on the modulus of blends were studied by tensile test and Dynamic Mechanical Analysis (DMA). It was found that K3 can be dispersed in iPP matrix in a spherical form and its particles size can be adjusted by MAPP content. The incorporation of K3 and MAPP can obviously improve the Youngs modulus and storage modulus of blends.
Authors: Qing Yang, Bai Lin Zheng, Kai Zhang, Jian Xin Zhu
Abstract: An Elastic solution for functionally graded cantilever beam with different modulus in tension and compression subjected to a uniform pressure on the lateral surface is investigated. The elastic modulus of tension and compression vary with the thickness as an arbitrary function, respectively, which makes the solution have a broader range of applications than the homogeneous ones. When the tension and compression modulus have the same constant value, the solution degenerates into the classical one of the cantilever beam.
Authors: U. Harms, R.B. Schwarz
Authors: Shao He Li, Qun Xian Lin, Jian Wu
Abstract: The single pile subsidence quantity computation and the analysis theoretically has the load to transmit the law, the cutting deflection method, the theory of elasticity law and the lamination always legitimate and so on. This article has through hierarchical total legal analysis in bored pile end grouting after pile subsidence influence factor, And in a project as a background, establishes the single pile ANSYS finite element model in civil engineering. For the pile are no grouting, grouting pile slurry bubble size, grouting pile of grouting modulus such as the change of the situation analysis. The author drew on the bored pile end after grouting pile subsidence influence factor and the main reasons as well as some useful conclusions
Authors: Si Qun Wang, San Deep Nair, Donna Hurley, Seung Hwan Lee
Abstract: Advanced atomic force microscopy techniques such as contact resonance force microscopy, noncontact mode phase imaging, and scanning thermal microscopy techniques have been used to characterize material properties in the interphase of fiber reinforced polymer composites. With contact resonance force microscopy, the average interphase thickness was found to be (49 ± 5) nm, (64 ± 12) nm, and (139 ± 21) nm for samples containing lyocell fibers in matrix materials consisting of 100 % polypropylene (PP)/0 % maleated polypropylene (MAPP), 95 % PP/5 % MAPP, and 90 % PP/10 % MAPP, respectively. Clear distinctions in modulus values between the fiber, interphase zone, and matrix are clearly visible in modulus images. A gradient of modulus was observed across the interphase region that ranged between the modulus values of fiber and the polymer matrix. Noncontact mode images showed a clear phase difference between the fiber, interphase, and matrix owing to the difference in material properties between the components. Interphase regions were observed to possess higher thermal conductivity than the matrix polymer due to cross-linking within the interphase.
Authors: C. Ambika, G. Hirankumar
Abstract: Nanocomposite solid polymer electrolytes comprise of PMMA (poly methyl methacrylate), PVP (poly vinyl pyrolidone), MSA (methanesulfonic acid) and TiO2 as nanofiller were prepared by solution casting technique at different compositions. Sample with 1 mol% incorporated TiO2 has shown maximum conductivity and its value was found as 2.82 ×10-5 S/cm. The value of conductivity has been enhanced to about 31% upon the addition of nanofiller. The relaxation time for all the prepared composites as well as for the composite having maximum conductivity at various isotherms have been calculated from the loss tangent plot. The frequency and temperature dependence of dielectric constant and dielectric loss nanocomposite solid polymer electrolytes have also been studied. The modulus analysis confirms the non-Debye type formalism in the prepared composites.
Authors: Nargess Tahmassebi
Abstract: In the present study, the influence of addition of various loads of hydrophobic nano silica on modulus of an acrylic melamine automotive topcoat was investigated. The results indicated that addition of hydrophobic nano silica to acrylic melamine decreased its Young’s modulus. The same behavior was observed for nano indentation modulus just at low nano silica content. This property was increased at high nano silica content. Poor interaction between nano particles / acrylic melamine and ball bearing effects of nano particles were used to explain decrease in modulus. Increase in nano indentation modulus was attributed to particle flocculation.
Authors: Xiao Hua Wang, Ji Shu Sun, Tian Xiao, Hui Ran Pi
Abstract: Asphalt layer modulus is one of the important mechanical parameters in pavement design. It will directly influence the design result and the mechanical properties of asphalt pavement structure. Using pavement design and analysis software, the effects of asphalt layer modulus on surface deflection, tensile stress at the bottom of base and sub-base course, stress at the the bottom of asphalt layer and service life of heavy load semi-rigid asphalt pavement structure were analyzed systematically. And the influencing laws were analyzed, too. The results indicate that the mechanical properties, deforming characteristics and service life of heavy load asphalt pavement were influnced significantly by asphalt layer modulus. With the increasing of asphalt layer modulus, the surface deflection, tensile stress at the bottom of base and sub-base course would significantly decrease, and service life of heavy load semi-rigid asphalt pavement structure would be improved.
Authors: I.S. Aji, E.S. Zainuddin, Abdan Khalina, S.M. Sapuan
Abstract: Hybridization, especially where only variant natural lignocelluloses are combined, is fast receiving encouraging attention because it offers range of properties that are quite difficult to obtain with a single kind of reinforcement. In this work, tensile strength and modulus of hybridized kenaf/PALF reinforced HDPE composite was examined. Pellets were produced form the mixture of the composite in an internal mixer at 190oC, 40rpm and 25minutes for processing temperature, speed and duration of mixing respectively. The composite sheets with thickness of 1mm produced from pellets were prepared using compression moulding. Then the tensile specimen were prepared and tested using an INSTRON bluehill universal testing machine according to ASTM D638 requirements. All samples were prepared at 1:1 kenaf:PALF ratio; ≤0.25mm and ≤0.5mm fibre length; fiber loading of 10 to 40% were utilized. Linear relationship of tensile modulus was observed with about 26% reduction in tensile strength at 10% fibre loading that subsequently reduced but with a reversal increase at 40% fibre loading. This was attributed to a better supportive load at that fibre content and a better interaction between fibre and matrix. Furthermore, the result also corroborates with the one obtained for the tensile modulus at same fibre loading. The best tensile strength and tensile modulus obtained was 32.43MPa;642.61MPa and 30.01MPa;636.73MPa for 0.25mm and 0.5mm fibre length respectively. Increase in fibre length did not show any significant improvement in tensile strength which may have been coursed by fibre attrition. It is possible to achieve improved mechanical properties if the fibres are given some kind of treatment.
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