The Experts below are selected from a list of 7680 Experts worldwide ranked by ideXlab platform

Yoshinobu Shimamura - One of the best experts on this subject based on the ideXlab platform.

  • Reciprocating Bending Deformation and Mechanical Response of Shape-control Plate Using NiTi Shape Memory Alloy Wire:
    Journal of Intelligent Material Systems and Structures, 2010
    Co-Authors: Keiichiro Tohgo, Yoshinobu Shimamura
    Abstract:

    This study deals with deformation and mechanical response of a shape-control plate, which consists of an aluminum alloy plate and a pre-strained NiTi shape memory alloy (SMA) wire. The shape-control plate exhibits reciprocating bending deformation by heating and cooling. Bending deformation tests of the plate are carried out by electric heating and natural cooling of the SMA wire, and then mechanical response of the bent plate under electric heating is examined by three-point bending. The experimental results exhibit that the bending deformation of the plate is considerably stable over more than 2000 heating-cooling cycles, and that a load-deflection relation of the bent plate is almost linear. Furthermore, the bending deformation and mechanical response of the plate are analyzed by a Simple Beam Theory for the aluminum alloy plate and Brinson’s one-dimensional constitutive model for the SMA wire. The numerical results describe well the deformation behavior and mechanical response of the shape-control pla...

  • Deformation Behavior of Shape-Control Plate Using NiTi Shape Memory Alloy Wire
    Key Engineering Materials, 2007
    Co-Authors: Keiichiro Tohgo, Yuki Tochigi, Hiroyasu Araki, Yoshinobu Shimamura
    Abstract:

    This study deals with deformation behavior of a shape-control plate which consists of an aluminum alloy plate and a pre-strained NiTi shape memory alloy (SMA) wire. The shape-control plate exhibits reciprocating bending deformation by heating and cooling. Deformation behavior of the plate is examined by electric heating and natural cooling of the SMA wire. Experimental results exhibit that the bending deformation of the plate is considerably stable over more than two thousand heating-cooling cycles and can be well controlled by electric current. Furthermore, the deformation behavior of the plate is analyzed by a Simple Beam Theory for the aluminum alloy plate and Brinson’s one-dimensional constitutive model for the SMA wire taking account of not only martensitic transformation but also rhombohedral-phase transformation. Numerical results describe well the deformation behavior of the shape-control plate observed in the experiments.

Keiichiro Tohgo - One of the best experts on this subject based on the ideXlab platform.

  • Reciprocating Bending Deformation and Mechanical Response of Shape-control Plate Using NiTi Shape Memory Alloy Wire:
    Journal of Intelligent Material Systems and Structures, 2010
    Co-Authors: Keiichiro Tohgo, Yoshinobu Shimamura
    Abstract:

    This study deals with deformation and mechanical response of a shape-control plate, which consists of an aluminum alloy plate and a pre-strained NiTi shape memory alloy (SMA) wire. The shape-control plate exhibits reciprocating bending deformation by heating and cooling. Bending deformation tests of the plate are carried out by electric heating and natural cooling of the SMA wire, and then mechanical response of the bent plate under electric heating is examined by three-point bending. The experimental results exhibit that the bending deformation of the plate is considerably stable over more than 2000 heating-cooling cycles, and that a load-deflection relation of the bent plate is almost linear. Furthermore, the bending deformation and mechanical response of the plate are analyzed by a Simple Beam Theory for the aluminum alloy plate and Brinson’s one-dimensional constitutive model for the SMA wire. The numerical results describe well the deformation behavior and mechanical response of the shape-control pla...

  • Deformation Behavior of Shape-Control Plate Using NiTi Shape Memory Alloy Wire
    Key Engineering Materials, 2007
    Co-Authors: Keiichiro Tohgo, Yuki Tochigi, Hiroyasu Araki, Yoshinobu Shimamura
    Abstract:

    This study deals with deformation behavior of a shape-control plate which consists of an aluminum alloy plate and a pre-strained NiTi shape memory alloy (SMA) wire. The shape-control plate exhibits reciprocating bending deformation by heating and cooling. Deformation behavior of the plate is examined by electric heating and natural cooling of the SMA wire. Experimental results exhibit that the bending deformation of the plate is considerably stable over more than two thousand heating-cooling cycles and can be well controlled by electric current. Furthermore, the deformation behavior of the plate is analyzed by a Simple Beam Theory for the aluminum alloy plate and Brinson’s one-dimensional constitutive model for the SMA wire taking account of not only martensitic transformation but also rhombohedral-phase transformation. Numerical results describe well the deformation behavior of the shape-control plate observed in the experiments.

Gordan Jelenić - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Simple Beam Theory for characterising mode-I fracture resistance via a double cantilever Beam test
    Composites Part B: Engineering, 2019
    Co-Authors: Leo Škec, Giulio Alfano, Gordan Jelenić
    Abstract:

    Abstract We study a double-cantilever Beam (DCB), in which either the crack-mouth opening displacement or the end rotations are prescribed, in the linear-elastic-fracture-mechanics (LEFM) limit of an infinitely stiff and brittle interface. We present a novel, yet extremely Simple, derivation of the closed-form solution of this problem when the arms are modelled with Timoshenko Beam Theory. We remove the assumption that the cross sections of the DCB arms are assumed not to rotate (i.e. that they are clamped) at the crack tip, which is made in so-called ‘Simple Beam Theory’ (SBT). Therefore, with our ‘enhanced Simple Beam Theory’ (ESBT), in front of the crack tip, cross sections are allowed to rotate, although the Beam axis stays undeformed. Thus, we can determine the crack-tip rotation caused by the deformation of the Beam in front of the crack tip also in the LEFM limit. As a result, most of the inaccuracies of the SBT are eliminated, without the need for a crack-length correction, used in the ‘corrected Beam Theory’ (CBT). In this way, we can derive a very accurate data reduction formula for the critical energy release rate, G c , which does not require the measurement of the crack length, unlike CBT. In our numerical results we show that, compared to the most effective data reduction methods currently available (including CBT), our formula is either as accurate or more accurate for the case of brittle delamination of thick composite plates, in which shear deformability can play a significant role.

Michael M Bertioli - One of the best experts on this subject based on the ideXlab platform.

  • A high accuracy resonant pressure sensor by fusion bonding and trench etching
    Sensors and Actuators A-physical, 1999
    Co-Authors: Christopher J Welham, John Greenwood, Michael M Bertioli
    Abstract:

    A pressure sensor based upon an electrostatically driven and piezoresistively sensed 'double-shuttle' lateral resonator is presented. The resonator has been designed using Simple Beam Theory and the mode shapes investigated using finite element analysis. The sensor is fabricated using fusion bonding, wafer thinning and trench etching. Measurements of preliminary devices yield a fundamental frequency of = 50 kHz and Q-factor of 1000 in air at atmospheric pressure, rising to over 50,000 in high vacuum (

Vipulkumar Ishvarbhai Patel - One of the best experts on this subject based on the ideXlab platform.

  • A Simple shear deformation Theory for nonlocal Beams
    Composite Structures, 2018
    Co-Authors: Son Thai, Huu-tai Thai, Vipulkumar Ishvarbhai Patel
    Abstract:

    In this paper, a Simple Beam Theory accounting for shear deformation effects with one unknown is proposed for static bending and free vibration analysis of isotropic nanoBeams. The size-dependent behaviour is captured by using the nonlocal differential constitutive relations of Eringen. The governing equation of the present Beam Theory is obtained by using equilibrium equations of elasticity Theory. The present Theory has strong similarities with nonlocal Euler–Bernoulli Beam Theory in terms of the governing equation and boundary conditions. Analytical solutions for static bending and free vibration are derived for nonlocal Beams with various types of boundary conditions. Verification studies indicate that the present Theory is not only more accurate than Euler–Bernoulli Beam Theory, but also comparable with Timoshenko Beam Theory.