The Experts below are selected from a list of 348 Experts worldwide ranked by ideXlab platform

Ton Peijs - One of the best experts on this subject based on the ideXlab platform.

  • toughening mechanisms in cellulose nanopaper the contribution of amorphous regions
    Cellulose, 2017
    Co-Authors: Nan Meng, Wei Tu, Ton Peijs
    Abstract:

    Cellulose nanopaper is a strong and tough fibrous network composed of hydrogen bonded cellulose nanoFibres. Upon loading, cellulose nanopaper exhibits a long inelastic portion of the stress–strain curve which imparts high toughness into the material. Toughening mechanisms in cellulose nanopaper have been studied in the past but mechanisms proposed were often rather speculative. In this paper, we aim to study potential toughening mechanisms in a systematic manner at multiple hierarchical levels in cellulose nanopaper. It was proposed that the toughness of cellulose nanopaper is not, as is often assumed, entirely caused by large scale inter-Fibre Slippage and reorientation of cellulose nanoFibres. Here it is suggested that dominant toughening mechanism in cellulose nanopaper is associated with segmental motion of molecules facilitated by the breakage of hydrogen bonds within amorphous regions .

Nan Meng - One of the best experts on this subject based on the ideXlab platform.

  • toughening mechanisms in cellulose nanopaper the contribution of amorphous regions
    Cellulose, 2017
    Co-Authors: Nan Meng, Wei Tu, Ton Peijs
    Abstract:

    Cellulose nanopaper is a strong and tough fibrous network composed of hydrogen bonded cellulose nanoFibres. Upon loading, cellulose nanopaper exhibits a long inelastic portion of the stress–strain curve which imparts high toughness into the material. Toughening mechanisms in cellulose nanopaper have been studied in the past but mechanisms proposed were often rather speculative. In this paper, we aim to study potential toughening mechanisms in a systematic manner at multiple hierarchical levels in cellulose nanopaper. It was proposed that the toughness of cellulose nanopaper is not, as is often assumed, entirely caused by large scale inter-Fibre Slippage and reorientation of cellulose nanoFibres. Here it is suggested that dominant toughening mechanism in cellulose nanopaper is associated with segmental motion of molecules facilitated by the breakage of hydrogen bonds within amorphous regions .

Van Vuure, Aart Willem - One of the best experts on this subject based on the ideXlab platform.

  • Digital image correlation as strain measurement technique for Fibre tensile tests
    Elsevier Science Ltd., 2017
    Co-Authors: Depuydt Delphine, Hendrickx Kevin, Biesmans Wouter, Ivens Jan, Van Vuure, Aart Willem
    Abstract:

    A method is presented to test Fibres in tension using direct strain measurement. This eliminates the need to test the Fibres at multiple gauge lengths to correct for machine compliance, reducing the number of samples. Additionally, Fibre Slippage can contribute to the underestimation of the stiffness since this is not considered in the correction procedure. Steel Fibres with a diameter of 30 µm, and a known stiffness of 193 GPa, were tested in tension using indirect methods and the direct strain method. Direct strain measurement resulted in a stiffness of 187 ± 12 GPa while the lowest and highest stiffness obtained by the indirect methods are 140 ±2 GPa and 150 ± 4 GPa. The underestimation by the indirect measurement strain methods show the need for a new method. To demonstrate the applicability of the new test method to natural Fibres, the properties of technical flax and bamboo Fibres were determined.status: publishe

  • Digital image correlation as a strain measurement technique for Fibre tensile tests
    'Elsevier BV', 2017
    Co-Authors: Depuydt Delphine, Hendrickx Kevin, Biesmans Wouter, Ivens Jan, Van Vuure, Aart Willem
    Abstract:

    © 2017 Elsevier Ltd A method is presented to test Fibres in tension using direct strain measurement. This eliminates the need to test the Fibres at multiple gauge lengths to correct for machine compliance, reducing the number of samples. Additionally, Fibre Slippage can contribute to the underestimation of the stiffness since this is not considered in the correction procedure. Steel Fibres with a diameter of 30 μm, and a known stiffness of 193 GPa, were tested in tension using indirect methods and the direct strain method. Direct strain measurement resulted in a stiffness of 187 ± 12 GPa while the lowest and highest stiffness obtained by the indirect methods are 140 ± 2 GPa and 150 ± 4 GPa. The underestimation by the indirect measurement strain methods show the need for a new method. To demonstrate the applicability of the new test method to natural Fibres, the properties of technical flax and bamboo Fibres were determined.status: publishe

Wei Tu - One of the best experts on this subject based on the ideXlab platform.

  • toughening mechanisms in cellulose nanopaper the contribution of amorphous regions
    Cellulose, 2017
    Co-Authors: Nan Meng, Wei Tu, Ton Peijs
    Abstract:

    Cellulose nanopaper is a strong and tough fibrous network composed of hydrogen bonded cellulose nanoFibres. Upon loading, cellulose nanopaper exhibits a long inelastic portion of the stress–strain curve which imparts high toughness into the material. Toughening mechanisms in cellulose nanopaper have been studied in the past but mechanisms proposed were often rather speculative. In this paper, we aim to study potential toughening mechanisms in a systematic manner at multiple hierarchical levels in cellulose nanopaper. It was proposed that the toughness of cellulose nanopaper is not, as is often assumed, entirely caused by large scale inter-Fibre Slippage and reorientation of cellulose nanoFibres. Here it is suggested that dominant toughening mechanism in cellulose nanopaper is associated with segmental motion of molecules facilitated by the breakage of hydrogen bonds within amorphous regions .

Das B R - One of the best experts on this subject based on the ideXlab platform.

  • Tensile failure of blended spun yarns under dynamic condition: Part I –Yarn failure during warping
    NISCAIR-CSIR India, 2016
    Co-Authors: Ishtiaque S M, Rengasamy R S, Das B R
    Abstract:

    255-262The failure behaviour of polyester/viscose blended ring, rotor and air-jet spun yarns has been studied on the basis of Fibre failure coefficient, yarn broken end configuration and failure zone length. The failure behaviour of spun yarns under warping process is simulated in the dynamic tensile tester. The tensile failure behaviour of ring, rotor and air-jet yarns are found to be different owing to their difference in Fibre consolidation mechanism. The yarn failure is observed to be more and more dominated by Fibre Slippage once moving from ring to rotor and finally to air-jet yarns. The study also reports mathematical modeling of spun yarn failure behaviour during warping process. The mathematical model indicates that the spun yarn failure is non-linearly related to yarn structural parameters