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  • Open Access

    Study on Residual Stresses in Unidirectional Flax Fiber/ Vinyl Ester Composites by XRD Technique

    Shanshan Huo, Chad A. Ulven*

    Journal of Renewable Materials, Vol.5, Suppl.1, pp. 106-116, 2017, DOI:10.7569/JRM.2017.634136

    Abstract The development of flax fiber reinforced polymer composites with improved properties has been increasingly studied by many researchers because of their sustainability. However, the effects of thermal residual stresses on the interfacial properties of flax composites have not been evaluated or very well understood. In this study, the thermal properties of flax, vinyl ester matrices and their composites were accessed by different techniques, including thermomechanical analyzer, dynamic mechanical analyzer, and X-ray diffraction combined with aluminum particles. The effects of thermal properties of flax fibers and vinyl ester resin systems on the mechanical properties of their biocomposites were studied. The theory… More >

  • Open Access


    Effect of chemical mutagens and X-rays on morphological and physiological traits of tulips

    edaghathoor S, F Sharifi, A Eslami

    Phyton-International Journal of Experimental Botany, Vol.86, pp. 252-257, 2017, DOI:10.32604/phyton.2017.86.252

    Abstract The tulip (Tulipa sp.) is an ornamental plant produced by bulbs. Wild tulips are native to several areas of Iran, especially the Alborz and Zagros mountains. Endemic Iranian tulips are the origin of some commercial cultivars of tulip, and mutagens are commonly used to produce new traits and varieties. In this trial, X-rays were applied at 60, 70 and 80 kV; sodium azide (SA) at doses of 0.01%, 0.02%, and 0.03%, and diethyl sulfate (DES) at doses of 0.1%, 0.2% and 0.4 on Kess Nelis and Jan Van Ness varieties of tulip. Morphophysiological traits of the treated plants were measured.… More >

  • Open Access


    The Residual Stress State Due to Machining of Turbine Components: Experimental Investigation

    M. Lavella1, T. Berruti1

    Structural Durability & Health Monitoring, Vol.5, No.4, pp. 337-350, 2009, DOI:10.3970/sdhm.2009.005.337

    Abstract Results of residual stress measurements on Inconel 718 turbine components after machining are here presented. The work is focused on the experimental detection of the residual stress state produced after turning (orthogonal cutting and standard) and milling. The aim of the experimental activity was to supply an experimental data base of proved reliability for milling and turning model validation. This activity was performed inside the EU STREP project VERDI. The residual stresses were detected by means of X-ray diffraction technique. The experimental plan of measurements was performed on components worked with different working parameters (cutting velocity and feed rate) and… More >

  • Open Access


    Investigation on Material Properties by Synchrotron Radiation X-Ray Computed Tomography

    Hu Xiaofang, Xu Feng, Wang Ming, Wu Xiaoping

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.4, pp. 119-120, 2011, DOI:10.3970/icces.2011.018.119

    Abstract The Synchrotron Radiation X-ray Computed Tomography (SR-CT) technique is a non- destructive detection technology which can give the in-situ observation of microstructure evolution of materials under the external field (e.g., high pressure, high temperature, electromagnetic field, intense radiation, etc.), and it has a significant application in the area of plants and crops, advanced manufacturing, advanced materials, biomedicine, mechanics, archaeology and so on. More >

  • Open Access


    Crystallite Size Distribution Determination By X-Ray Diffraction

    D. Balzar1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.10, No.1, pp. 7-8, 2009, DOI:10.3970/icces.2009.010.007

    Abstract X-ray diffraction is a useful technique for the estimation of size distributions of smaller crystallites. With the constant improvement of experimental techniques, especially with the advent of new-generation synchrotron and neutron sources with superior resolution, these size distributions can be precisely determined. Furthermore, modern methods for the analysis of X-ray diffraction patterns, such as Rietveld refinement, increasingly go beyond the determination of structural parameters and include refinable parameters for a physical crystallite size distribution.

    Several common size distributions (such as lognormal and gamma) will be considered. Particularly, a lognormal distribution of both ellipsoidal and cylindrical crystals with elliptical cross-sections can… More >

  • Open Access


    Effects of Processing Parameters on Mechanical Properties and Structure of Banana Fiber-Reinforced Composites

    Dan-Thuy Van-Pham1,*, Minh Tri Nguyen1, Chanh-Nghiem Nguyen2, Thi Truc Duyen Le1, Thi Yen Nhu Pham1, Khai Thinh Nguyen2, Yukihiro Nishikawa3, Qui Tran-Cong-Miyata3

    Journal of Renewable Materials, Vol.6, No.6, pp. 662-670, 2018, DOI:10.7569/JRM.2018.634107

    Abstract The mechanical properties of unidirectional natural fiber-reinforced composites are generally affected by several processing parameters during compression molding. This study investigates the effects of processing temperature, time, and pressure on the tensile and flexural properties of acrylonitrile butadiene styrene reinforced by banana fibers. X-ray CT imaging was employed to find the relationship between the mechanical properties and structure of the processed composite. Besides, the water absorption of composites was observed and the way in which the mechanical properties evolved after water absorption was analyzed. The tensile and flexural properties of the unidirectional banana fiber-reinforced composite were found to be inversely… More >

  • Open Access


    Residual Stresses in Resistance Spot Welded AZ61 Mg Alloy

    Davood Afshari1,*, Soheil Mirzaahamdi1, Zuheir Barsoum2

    CMES-Computer Modeling in Engineering & Sciences, Vol.118, No.2, pp. 275-290, 2019, DOI:10.31614/cmes.2019.03880

    Abstract The use of magnesium alloys has been rapidly increased due to their ability to maintain high strengths at light weights. However weldability of steels and aluminum alloys by using resistance spot weld (RSW) process is a major issue, because it cannot be directly utilized for magnesium alloys. In this study, a structural-thermal-electrical finite element (FE) model has been developed to predict the distribution of residual stresses in RSW AZ61 magnesium alloy. Thermophysical and thermomechanical properties of AZ61 magnesium alloy have been experimentally determined, and have been used in FE model to increase the accuracy of the model. X-ray diffraction (XRD)… More >

  • Open Access


    Numerical Simulation of Graphite Properties Using X-ray Tomography and Fast Multipole Boundary Element Method

    H. T. Wang, G. Hall, S. Y. Yu, Z. H. Yao

    CMES-Computer Modeling in Engineering & Sciences, Vol.37, No.2, pp. 153-174, 2008, DOI:10.3970/cmes.2008.037.153

    Abstract Graphite materials are widely used in gas-cooled nuclear reactors as both moderators and reflectors. The graphite properties change when the microstructure damage occurs due to the in-core radiation and oxidation, thereby having a strong impact on the service life of graphite. In this paper, the X-ray tomography and the boundary element method (BEM) are introduced to the microstructure modeling and numerical simulations of both the mechanical and thermal property changes of nuclear graphite due to radiolytic oxidation. The model is established by the three-dimensional X-ray scan on the isotropic nuclear graphite Gilsocarbon, which is used in the UK commercial reactors.… More >

  • Open Access


    Numerical Analysis of Concrete Composites at the Mesoscale Based on 3D Reconstruction Technology of X-ray CT Images

    C.B. Du1,2, S.Y Jiang2, W. Qin3, Y.M. Zhang2

    CMES-Computer Modeling in Engineering & Sciences, Vol.81, No.3&4, pp. 229-248, 2011, DOI:10.3970/cmes.2011.081.229

    Abstract A numerical analysis of concrete composites at the mesoscale based on three-dimensional (3D) reconstruction technology of X-ray computed tomography (CT) images is presented in this paper. For X-ray CT images of concrete, morphology processing was used to recover complete image information, including borders, and the median filtering method was applied to eliminate potential impurities in the images. The final X-ray CT images obtained after processing for a concrete section were composed of three-value pixels that indicated aggregate particles, mortar matrix and air voids, and the 3D structure of the concrete specimen was reconstructed using the volume data method. The mapping… More >

  • Open Access


    A Flexible Approach for the Calibration of Biplanar Radiography of the Spine on Conventional Radiological Systems

    Daniel C. Moura1, Jorge G. Barbosa1, Ana M. Reis2, João Manuel R. S. Tavares3

    CMES-Computer Modeling in Engineering & Sciences, Vol.60, No.2, pp. 115-138, 2010, DOI:10.3970/cmes.2010.060.115

    Abstract This paper presents a new method for the calibration of biplanar radiography that makes possible performing 3D reconstructions of the spine using conventional radiological systems. A novel approach is proposed in which a measuring device is used for determining focal distance and have a rough estimation of translation parameters. Using these data, 3D reconstructions of the spine with correct scale were successfully obtained without the need of calibration objects, something that was not previously achieved. For superior results, two optional steps may be executed that involve an optimisation of the geometrical parameters, followed by a scale adjustment with a very… More >

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