The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform

Jia-yang Juang - One of the best experts on this subject based on the ideXlab platform.

  • hertzian load Displacement Relation holds for spherical indentation on soft elastic solids undergoing large deformations
    Tribology International, 2016
    Co-Authors: Keng-hui Lin, Jia-yang Juang
    Abstract:

    Abstract In this paper we investigate the validity of the Hertz theory at very large deformations by performing rigid spherical indentation on soft, linearly elastic silicone substrates using nanoindentation tests and finite element method. We show that the theory significantly underestimates and overestimates the contact radius and maximum contact pressure, respectively, as the ratio of indenter Displacement δ to the indenter radius R exceeds 0.1. However, the loading load–Displacement Relation still holds ( 10. Our results may provide practical guidelines to proper sample preparation and better interpretation of indentation data of elastic soft elastomers and gels.

  • Hertzian load–Displacement Relation holds for spherical indentation on soft elastic solids undergoing large deformations
    Tribology International, 2016
    Co-Authors: Keng-hui Lin, Jia-yang Juang
    Abstract:

    Abstract In this paper we investigate the validity of the Hertz theory at very large deformations by performing rigid spherical indentation on soft, linearly elastic silicone substrates using nanoindentation tests and finite element method. We show that the theory significantly underestimates and overestimates the contact radius and maximum contact pressure, respectively, as the ratio of indenter Displacement δ to the indenter radius R exceeds 0.1. However, the loading load–Displacement Relation still holds ( 10. Our results may provide practical guidelines to proper sample preparation and better interpretation of indentation data of elastic soft elastomers and gels.

Fuqian Yang - One of the best experts on this subject based on the ideXlab platform.

  • load Displacement Relation in adhesion measurement
    Journal of Physics D, 2003
    Co-Authors: Fuqian Yang
    Abstract:

    Using linear elasticity theory and thermodynamics, a thermodynamic criterion for equilibrium contact between two solid surfaces in atomic force microscopy (AFM) was established, in which the cantilever beam and tip of the AFM were modelled as an elastic spring and a microparticle, respectively. The elastic energy stored in the spring was included in the calculation of system energy. A new Relation between the adhesion energy and the Displacement of the microparticle at the separation was established, which could be used to calculate the adhesion energy between solid surfaces.

  • Load–Displacement Relation in adhesion measurement
    Journal of Physics D: Applied Physics, 2003
    Co-Authors: Fuqian Yang
    Abstract:

    Using linear elasticity theory and thermodynamics, a thermodynamic criterion for equilibrium contact between two solid surfaces in atomic force microscopy (AFM) was established, in which the cantilever beam and tip of the AFM were modelled as an elastic spring and a microparticle, respectively. The elastic energy stored in the spring was included in the calculation of system energy. A new Relation between the adhesion energy and the Displacement of the microparticle at the separation was established, which could be used to calculate the adhesion energy between solid surfaces.

  • Large deformation of a thin disk by a cylindrical punch
    Mechanics of Materials, 1997
    Co-Authors: Fuqian Yang, Emily Hackett
    Abstract:

    Abstract By using the finite element code ABAQUS for large deformation, the behavior of a thin disk clamped at the circumference and loaded at the center by a rigid flat-end cylindrical punch was studied. The contact between the punch and the disk is assumed frictionless. The load/Displacement Relation is compared with analytical results for a point load and they seem to differ by a constant factor for large deformation. This factor depends on the size of the punch and the internal stress in the disk.

Lizhi Sun - One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear elastic load-Displacement Relation for spherical indentation on rubberlike materials
    Journal of Materials Research, 2010
    Co-Authors: D. X. Liu, Zhidong Zhang, Lizhi Sun
    Abstract:

    Because of the lack of universal contact models for nonlinear strain problems, indentation analysis on rubberlike materials is confined to small deformation in which Hertz's solution is applied. Recognizing that deep indentation may provide more material information, in this paper we propose a nonlinear elastic model for large spherical indentation of rubberlike materials based on the higher-order approximation of spherical function and Sneddon's solution. The effect of limiting network stretch is studied on the initial elastic modulus for lightly cross-linked rubbers. With the comparisons of the finite-element simulation and the experimental result, the proposed model is verified to predict the large indentation of rubberlike materials over the indentation depth of 0.8 times the indenter radius.

Keng-hui Lin - One of the best experts on this subject based on the ideXlab platform.

  • hertzian load Displacement Relation holds for spherical indentation on soft elastic solids undergoing large deformations
    Tribology International, 2016
    Co-Authors: Keng-hui Lin, Jia-yang Juang
    Abstract:

    Abstract In this paper we investigate the validity of the Hertz theory at very large deformations by performing rigid spherical indentation on soft, linearly elastic silicone substrates using nanoindentation tests and finite element method. We show that the theory significantly underestimates and overestimates the contact radius and maximum contact pressure, respectively, as the ratio of indenter Displacement δ to the indenter radius R exceeds 0.1. However, the loading load–Displacement Relation still holds ( 10. Our results may provide practical guidelines to proper sample preparation and better interpretation of indentation data of elastic soft elastomers and gels.

  • Hertzian load–Displacement Relation holds for spherical indentation on soft elastic solids undergoing large deformations
    Tribology International, 2016
    Co-Authors: Keng-hui Lin, Jia-yang Juang
    Abstract:

    Abstract In this paper we investigate the validity of the Hertz theory at very large deformations by performing rigid spherical indentation on soft, linearly elastic silicone substrates using nanoindentation tests and finite element method. We show that the theory significantly underestimates and overestimates the contact radius and maximum contact pressure, respectively, as the ratio of indenter Displacement δ to the indenter radius R exceeds 0.1. However, the loading load–Displacement Relation still holds ( 10. Our results may provide practical guidelines to proper sample preparation and better interpretation of indentation data of elastic soft elastomers and gels.

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

  • Stability analysis to a fuzzy control system of a superconducting actuator including two nonlinear blocks
    [Proceedings 1993] Second IEEE International Conference on Fuzzy Systems, 1
    Co-Authors: T. Kitamura, M. Komori
    Abstract:

    The stability of a fuzzy control system of a high-T/sub c/ superconducting actuator is analyzed. The control system has two nonlinear blocks, due to a hysteretic force-Displacement Relation of the actuator and due to the fuzzy proportional-derivative (PD) controller. The control system is shown to be an equivalent to a two-variable Lurie system. A sufficient condition of asymptotic stability for the PD gains is obtained by applying stability theory to a multivariable Lurie system. >