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Alloy Fibre

The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform

Michael I. Friswell – 1st expert on this subject based on the ideXlab platform

  • Multi-scale finite element model for a new material inspired by the mechanics and structure of wood cell-walls
    Journal of The Mechanics and Physics of Solids, 2012
    Co-Authors: Erick I. Saavedra Flores, Michael I. Friswell

    Abstract:

    Abstract This paper proposes a fully coupled multi-scale finite element model for the constitutive description of an alumina/magnesium Alloy/epoxy composite inspired in the mechanics and structure of the wall of wood cells. The mechanical response of the composite (the large scale continuum) is described by means of a representative volume element (RVE, corresponding to the intermediate scale) in which the Fibre is represented as a periodic alternation of alumina and magnesium Alloy fractions. Furthermore, at a lower scale the overall constitutive behavior of the alumina/magnesium Alloy Fibre is modelled as a single material defined by a large number of RVEs (the smallest material scale) at the Gauss point (intermediate) level. Numerical material tests show that this new composite maximises its toughness when the hierarchical design of wood cellulose Fibres is replicated. The above results provide for the first time new clues into the understanding of how trees and plants optimise their microstructures at the cellulose level in order to absorb a large amount of strain energy before failure. These findings are likely to shed more light into natural materials and bio-inspired design strategies, which are still not well-understood at present.

  • Multi-scale finite element model for a new material inspired by the mechanics and structure of wood cell-walls
    Journal of the Mechanics and Physics of Solids, 2012
    Co-Authors: E. I. Saavedra Flores, Michael I. Friswell

    Abstract:

    This paper proposes a fully coupled multi-scale finite element model for the constitutive description of an alumina/magnesium Alloy/epoxy composite inspired in the mechanics and structure of the wall of wood cells. The mechanical response of the composite (the large scale continuum) is described by means of a representative volume element (RVE, corresponding to the intermediate scale) in which the Fibre is represented as a periodic alternation of alumina and magnesium Alloy fractions. Furthermore, at a lower scale the overall constitutive behavior of the alumina/magnesium Alloy Fibre is modelled as a single material defined by a large number of RVEs (the smallest material scale) at the Gauss point (intermediate) level. Numerical material tests show that this new composite maximises its toughness when the hierarchical design of wood cellulose Fibres is replicated. The above results provide for the first time new clues into the understanding of how trees and plants optimise their microstructures at the cellulose level in order to absorb a large amount of strain energy before failure. These findings are likely to shed more light into natural materials and bio-inspired design strategies, which are still not well-understood at present. ?? 2012 Elsevier Ltd.

  • Fully Coupled Three-Scale Finite Element Model for the Mechanical Response of a New Bio-Inspired Composite
    ASME 2011 Conference on Smart Materials Adaptive Structures and Intelligent Systems Volume 2, 2011
    Co-Authors: Erick I. Saavedra Flores, Michael I. Friswell, Senthil Murugan, Eduardo A. De Souza Neto

    Abstract:

    This paper proposes a fully coupled three-scale finite element model for the mechanical description of an alumina/magnesium Alloy/epoxy composite inspired in the mechanics and architecture of wood cellulose Fibres. The constitutive response of the composite (the large scale continuum) is described by means of a representative volume element (RVE, corresponding to the intermediate scale) in which the Fibre is represented as a periodic alternation of alumina and magnesium Alloy fractions. Furthermore, at a lower scale the overall constitutive behavior of the alumina/magnesium Alloy Fibre is modelled as a single material defined by a large number of RVEs (the smallest material scale) at the Gauss point (intermediate) level. Numerical material tests show that the choice of the volume fraction of alumina based on those volume fractions of crystalline cellulose found in wood cells results in a maximisation of toughness in the present bio-inspired composite.Copyright © 2011 by ASME

Y. Shiraishi – 2nd expert on this subject based on the ideXlab platform

  • Development of an Artificial Myocardium using a Covalent Shape-memory Alloy Fiber and its Cardiovascular Diagnostic Response.
    Conference proceedings : … Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2020
    Co-Authors: Y. Shiraishi, T. Yambe, K. Sekine, Y. Saijo, Q. Wang, S. Nitta, S. Konno, N. Masumoto, J. Nagatoshi

    Abstract:

    The authors have been developing a newly-designed totally-implantable artificial myocardium using a covalent shape-memory Alloy Fibre (Biometal®, Toki Corporation), which is attached onto the ventricular wall and is also capable of supporting the natural ventricular contraction. This mechanical system consists of a contraction assistive device, which is made of Ti-Ni Alloy. And the phenomenon of the martensitic transformation of the Alloy was employed to achieve the physiologic motion of the device. The diameter of the Alloy wire could be selected from 45 to 250μm. In this study, the basic characteristics of the fiber of 150μm was examined to design the sophisticated mechano-electric myocardium. The stress generated by the fiber was 400gf under the pulsatile driving condition (0.4W, 1Hz). Therefore it was indicated that the effective assistance might be achieved by using the Biometal shape-memory Alloy fiber.

  • Assessment of synchronization measures for effective ventricular support by using the shape memory Alloy Fibred artificial myocardium in goats
    2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009
    Co-Authors: Y. Shiraishi, Akira Tanaka, F. Sato, T. K. Sugai, Y. Sato, T. Yambe, Y. Saijo, M. Yoshizawa, Y. Kaneko, M. Uematsu

    Abstract:

    Thromboembolic and haemorrhagic complications are the primary causes of mortality and morbidity in patients with artificial hearts, which are known to be induced by the interactions between blood flow and artificial material surfaces. The authors have been developing a new mechanical artificial myocardial assist device by using a sophisticated shape memory Alloy Fibre in order to achieve the mechanical cardiac support from outside of the heart without a direct blood contacting surface. The original material employed as the actuator of artificial myocardial assist devices was 100 um Fibred-shaped, which was composed of covalent and metallic bonding structure and designed to generate 4-7 % shortening by Joule heating induced by the electric current input. In this study, we focused on the synchronization of the actuator with native cardiac function, and the phase delay parameter was examined in animal experiments using Saanen goats. Total weight of the device including the actuator was around 150 g, and the electric power was supplied transcutaneously. The device could be successfully installed into thoracic cavity, which was able to be girdling the left ventricle. The contraction of the device could be controlled by the originally designed microcomputer. The mechanical contraction signal input had been transmitted with the phase delay of 50-200 msec after the R-wave of ECG, and hemodynamic changes were investigated. Cardiac output and systolic left ventricular pressure were elevated with 20% delay of cardiac cycle by 27% and 7%, respectively, although there was smaller difference under the condition of the delay of over 30%. Therefore, it was suggested that the synchronization measures should be examined in order to achieve sophisticated ventricular passive/active support on physiological demand.

  • Morphological Approach for the Functional Improvement of an Artificial Myocardial Assist Device using Shape Memory Alloy Fibres
    2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2007
    Co-Authors: Y. Shiraishi, Akira Tanaka, Daisuke Ogawa, F. Sato, M. Yoshizawa, T. Yambe, Y. Saijo, Y. Wada, S. Itoh, R. Sakata

    Abstract:

    The authors have been developing a mechano-electric artificial myocardial assist system (artificial myocardium) which is capable of supporting natural contractile functions from the outside of the ventricle without blood contacting surface. In this study, a nano-tech covalent type shape memory Alloy Fibre (Biometal, Toki Corp, Japan) was employed and the parallel-link structured myocardial assist device was developed. And basic characteristics of the system were examined in a mechanical circulatory system as well as in animal experiments using goats. The contractile functions were evaluated with the mock circulatory system that simulated systemic circulation with a silicone left ventricular model and an aortic afterload. Hemodynamic performance was also examined in goats. Prior to the measurement, the artificial myocardial assist device was installed into the goat’s thoracic cavity and attached onto the ventricular wall. As a result, the system could be installed successfully without severe complications related to the heating, and the aortic flow rate was increased by 15% and the systolic left ventricular pressure was elevated by 7% under the cardiac output condition of 3L/min in a goat. And those values were elevated by the improvement of the design which was capable of the natural morphological myocardial tissue streamlines. Therefore it was indicated that the effective assistance might be achieved by the contraction by the newly-designed artificial myocardial assist system using Biometal. Moreover it was suggested that the assistance gain might be obtained by the optimised configuration design along with the natural anatomical myocardial stream line.

Bingcheng Li – 3rd expert on this subject based on the ideXlab platform

  • processability and mechanical properties of surface modified glass Fibres phthalonitrile composite and al li Alloy Fibre metal laminates
    Materials Science and Technology, 2019
    Co-Authors: Aboubakr Medjahed, Mehdi Derradji, Abdeldjalil Zegaoui, Ruizhi Wu, Bingcheng Li

    Abstract:

    In this study, newly developed Fibre-metal laminates (Al-LiFMLs) were prepared by a lay-up process of a high-performance surface-modified glass Fibres/phthalonitrile (GFs/PN) composite and Al–Li al…

  • Processability and mechanical properties of surface-modified glass-Fibres/phthalonitrile composite and Al–Li Alloy Fibre-metal-laminates
    Materials Science and Technology, 2019
    Co-Authors: Aboubakr Medjahed, Mehdi Derradji, Abdeldjalil Zegaoui, Ruizhi Wu, Bingcheng Li

    Abstract:

    ABSTRACTIn this study, newly developed Fibre-metal laminates (Al-LiFMLs) were prepared by a lay-up process of a high-performance surface-modified glass Fibres/phthalonitrile (GFs/PN) composite and Al–Li Alloy. The results showed that varying the composite considerably affected the tensile properties of the Al-LiFMLs, as well as exhibiting enhancements over the properties of both the individual Al–Li Alloys and GFs/PN composite constituents. For instance, when the number of composite layers varied from 6 to 14, the ultimate tensile strength of the Al-LiFMLs increased from 315 to 611 MPa. It was revealed that the failure mode displayed a more ductile behaviour (up to 20%) for all the developed Al-LiFMLs affected by the ductile fracture mode of the Al–Li Alloy.