The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform

Jaroslav Šesták - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic composite laminates with unidirectional fiber reinforcement by novel pultrusion drawing
    Journal of Thermal Analysis and Calorimetry, 2014
    Co-Authors: Bronislav Foller, Michal Holub, Jaroslav Šesták
    Abstract:

    Three types of composites prepared by special pultrusion technology are tested for acoustic suitability as designed for industrial production of vibrating rods. Thermosetting pultrusion as a novel technique is introduced in more details. Isophtalic polyester matrix (Ashland S 599) reinforced by Glass Roving (OCV) discharged optimum results providing best listening tests in accordance with the dynamic mechanical analysis measurements of relative bend factor (Young’s modulus) and Glass transformation temperature ( T _g) as well as with the transverse vibrational frequencies and the sound attenuation in impact tests.

Thomas Gries - One of the best experts on this subject based on the ideXlab platform.

  • Characterization of shear behavior of warp-knitted fabrics applied to composite reinforcement
    Journal of The Textile Institute, 2016
    Co-Authors: Oleg Stolyarov, Till Quadflieg, Thomas Gries
    Abstract:

    Different types of textile fabrics are now widely used for reinforcing composite structural parts. In this work, three types of weft-inserted warp-knitted fabrics differing in stitch pattern and composed of Glass Roving were produced. The shear behavior of the developed fabrics was determined according to stitch type. Three basic stitch types were chosen: tricot, cord, and pillar. The shear behavior was examined by the picture frame test method. It was observed that the stitch type significantly affects the shear behavior of the fabrics. The deformation phases during the fabric shear test were analyzed. To estimate the changes in the shear stiffness of the fabrics, shear moduli were calculated as a function of the shear angle. In general, the fabric with the tricot stitch has the greatest shear resistance than that of fabrics with the cord and pillar stitches. The results of the characterization of shear behavior of the warp-knitted fabrics are presented and discussed.

  • Deformation of AR Glass Roving embedded in the warp knitted structure
    Journal of The Textile Institute, 2011
    Co-Authors: Mehdi Kamali Dolatabadi, Steffen Janetzko, Thomas Gries
    Abstract:

    In this paper, the influence of a high‐performance (HP) Roving deformation on the composite textile performance and the ultimate composite textile properties is discussed. Also, the deformation of an HP Roving during the tightening of a knit stitch is addressed in this paper. The impact of different orientations of the stitch and tensions on the deformation of the Roving is analytically investigated. For this purpose, an equation has been derived using the stitch length, the knot tightening tension and the packing density of the HP Roving by means of data of the Roving deformation in a right‐angle stitch and by a number of assumptions. Furthermore, an empirical method to measure the deformation of an alkali‐resistant (AR) Glass Roving in a right‐angle stitch is utilized in this study. It was found that the required tension to obtain maximum deformation of an AR Glass Roving when used in the weft direction is significantly low in comparison with other orientations of the Roving. For instance, a 0.41 N tens...

Bronislav Foller - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic composite laminates with unidirectional fiber reinforcement by novel pultrusion drawing
    Journal of Thermal Analysis and Calorimetry, 2014
    Co-Authors: Bronislav Foller, Michal Holub, Jaroslav Šesták
    Abstract:

    Three types of composites prepared by special pultrusion technology are tested for acoustic suitability as designed for industrial production of vibrating rods. Thermosetting pultrusion as a novel technique is introduced in more details. Isophtalic polyester matrix (Ashland S 599) reinforced by Glass Roving (OCV) discharged optimum results providing best listening tests in accordance with the dynamic mechanical analysis measurements of relative bend factor (Young’s modulus) and Glass transformation temperature ( T _g) as well as with the transverse vibrational frequencies and the sound attenuation in impact tests.

Nabil Naeem Rammo - One of the best experts on this subject based on the ideXlab platform.

  • Studying the Effect of Volume Fraction Variation and Environmental in Creep Behavior of Polyester Resin Composed With Fiber E-Glass(Mat) and Carbon Black Powder Particles
    Science Journal of University of Zakho, 2013
    Co-Authors: Gelass Mukaram Jamal, Harith Ibraheem Jafaar, Nabil Naeem Rammo
    Abstract:

    This research presents the results obtained from investigation of creep behavior for polyester resin composited with different volume fractions of fiber E-Glass(Roving) and carbon black powder under 4-point flexure test at ambient and 60oC. Flexure strength of W.R. composites show best values in comparison to particulate C.B. composites or to mixed W.R./C.B. composites. The creep strain measured up to 103 h for three different stresses namely 15,30 and 45 MPa shows that W.R. composites endures least strain of all other specimens. The 60oC temperature has little effect on the creep strain, at this temperature the creep strain increases by about 8% for the prepared specimens. Plot of creep modulus vs. time shows that the characteristic behavior is reciprocal of creep strain. Prior immersion in water to specimens for 30 days reveal that creep strain progressively increased for all prepared composites.

  • Investigation of Creep Behavior of Polyester Resin Composted with Different Volume Fractions of Fiber E-Glass and Aluminum Powder Particles
    2011
    Co-Authors: Gelass Mukaram Jamal, Harith Ibraheem Jafaar, Nabil Naeem Rammo
    Abstract:

    Creep behavior was carried for polyester resin composite prepered of different volume fractions of fiber E-Glass(Roving), and (aluminum powder)under 4-point flexure test at ambient temperature.Flexure strength of woven Roving composites show best values in comparison to particulate of aluminium powder . composites or to mixed WR/Al and composites.The creep strain measured up to 10 3 h for three different stresses namely 15,30 and 45 MPa show that WR composites endures least strain of all other specimens.Creep modulus vs. time show the characteristic behavior of reciprocal creep strain.A mathematical model employed to simulate creep

Sandro Fracasso - One of the best experts on this subject based on the ideXlab platform.

  • On-line Consolidation of Commingled Polypropylene/Glass Roving During Filament Winding
    2016
    Co-Authors: Riccardo De Gennaro, Francesca Fracasso, Francesco Montagna, Alfonso Maffezzoli, Sandro Fracasso
    Abstract:

    ABSTRACT: In this study, the in situ consolidation of polypropylene matrix/Glass reinforced Rovings was performed combining two heating systems, an infrared oven and a hot air gun, and a roll pressing the commingled Roving during hoop winding on a cylindrical mandrel. Process parameters were set up on the basis of a preliminary simulation of the heat transfer along the Roving and then comparison of the results with experimental temperature profiles obtained by a noncontact thermometer. Composite samples were cut along the cylinder axis for mechanical characterization. Physical properties, such as density and void content, obtained using different processing conditions, were compared. Electron microscopy was performed in order to assess how processing conditions affect fiber–matrix impregnation. KEY WORDS: thermoplastic matrix composites; filament winding; On-line con-solidatio

  • On-line Consolidation of Commingled Polypropylene/Glass Roving During Filament Winding
    Journal of Thermoplastic Composite Materials, 2011
    Co-Authors: Riccardo De Gennaro, Francesca Fracasso, Francesco Montagna, Alfonso Maffezzoli, Sandro Fracasso
    Abstract:

    In this study, the in situ consolidation of polypropylene matrix/Glass reinforced Rovings was performed combining two heating systems, an infrared oven and a hot air gun, and a roll pressing the commingled Roving during hoop winding on a cylindrical mandrel. Process parameters were set up on the basis of a preliminary simulation of the heat transfer along the Roving and then comparison of the results with experimental temperature profiles obtained by a noncontact thermometer. Composite samples were cut along the cylinder axis for mechanical characterization. Physical properties, such as density and void content, obtained using different processing conditions, were compared. Electron microscopy was performed in order to assess how processing conditions affect fiber–matrix impregnation.

  • on line consolidation of commingled polypropylene Glass Roving during filament winding
    Journal of Thermoplastic Composite Materials, 2011
    Co-Authors: Riccardo De Gennaro, Francesca Fracasso, Francesco Montagna, Alfonso Maffezzoli, Sandro Fracasso
    Abstract:

    In this study, the in situ consolidation of polypropylene matrix/Glass reinforced Rovings was performed combining two heating systems, an infrared oven and a hot air gun, and a roll pressing the commingled Roving during hoop winding on a cylindrical mandrel. Process parameters were set up on the basis of a preliminary simulation of the heat transfer along the Roving and then comparison of the results with experimental temperature profiles obtained by a noncontact thermometer. Composite samples were cut along the cylinder axis for mechanical characterization. Physical properties, such as density and void content, obtained using different processing conditions, were compared. Electron microscopy was performed in order to assess how processing conditions affect fiber–matrix impregnation.