The Experts below are selected from a list of 18831 Experts worldwide ranked by ideXlab platform

Arend Bayer - One of the best experts on this subject based on the ideXlab platform.

J J K Daemen - One of the best experts on this subject based on the ideXlab platform.

  • a modified creep model for cyclic characterization of rock salt considering the effects of the mean stress half amplitude and cycle period
    Rock Mechanics and Rock Engineering, 2020
    Co-Authors: Yue Han, Chunhe Yang, Nan Zhang, J J K Daemen
    Abstract:

    The fluctuation of the operation pressure during injection and withdrawal is a key factor affecting the long-term stability of surrounding rock in a compressed air energy storage (CAES) cavern. To assess the mechanical behavior of rock salt under different pressure fluctuations and to optimize the operating parameters of CAES caverns, uniaxial cyclic loading tests under the sine condition were carried out by changing three cycle parameters, namely the mean stress, half-amplitude and cycle period. The test results show that the Deformation behavior during cyclic loading tests can be divided into transient, steady, and accelerated stages, which is similar to that of creep tests. The strain and steady strain rates increase with increasing cycle parameters, showing a nonlinear Deformation Property of rock salt under cyclic loading. To describe the nonlinear response that cannot be captured by the Burgers model, a stiffness scaling factor is proposed based on the test results. A modified cyclic creep model of rock salt is established by introducing this stiffness scaling factor into the conventional Burgers creep model. The agreement with the experimental data indicates that the modified cyclic creep model can accurately reflect the influence of the three cyclic parameters on the Deformation properties of rock salt.

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

  • a modified creep model for cyclic characterization of rock salt considering the effects of the mean stress half amplitude and cycle period
    Rock Mechanics and Rock Engineering, 2020
    Co-Authors: Yue Han, Chunhe Yang, Nan Zhang, J J K Daemen
    Abstract:

    The fluctuation of the operation pressure during injection and withdrawal is a key factor affecting the long-term stability of surrounding rock in a compressed air energy storage (CAES) cavern. To assess the mechanical behavior of rock salt under different pressure fluctuations and to optimize the operating parameters of CAES caverns, uniaxial cyclic loading tests under the sine condition were carried out by changing three cycle parameters, namely the mean stress, half-amplitude and cycle period. The test results show that the Deformation behavior during cyclic loading tests can be divided into transient, steady, and accelerated stages, which is similar to that of creep tests. The strain and steady strain rates increase with increasing cycle parameters, showing a nonlinear Deformation Property of rock salt under cyclic loading. To describe the nonlinear response that cannot be captured by the Burgers model, a stiffness scaling factor is proposed based on the test results. A modified cyclic creep model of rock salt is established by introducing this stiffness scaling factor into the conventional Burgers creep model. The agreement with the experimental data indicates that the modified cyclic creep model can accurately reflect the influence of the three cyclic parameters on the Deformation properties of rock salt.

Chun Xu - One of the best experts on this subject based on the ideXlab platform.

  • laboratory evaluation on performance of diatomite and glass fiber compound modified asphalt mixture
    Materials & Design, 2015
    Co-Authors: Lili Li, Yubo Jiao, Yongchun Cheng, Chun Xu
    Abstract:

    The purpose of this paper is to investigate the compound effects of diatomite and glass fiber on asphalt mixture. The diatomite and glass fiber compound modified asphalt mixture (DGFMAM) was prepared in laboratory. Performances of DGFMAM were investigated by experimental method. Wheel tracking test, low temperature indirect tensile test, indirect tensile fatigue test (ITFT) and indirect tensile stiffness modulus test (ITSM) were carried out. The statistical analysis of variance (ANOVA) method and statistical regression method were used to evaluate the effects of diatomite and glass fiber on properties of asphalt mixture. Results indicate that diatomite and glass fiber improve the rutting resistance and fatigue properties of control asphalt mixture. Diatomite has a significant effect on the stiffness modulus of asphalt mixture. Disadvantage of diatomite on low temperature Deformation Property of asphalt mixture is solved by glass fiber. DGFMAM has better travelling performances than the control mixture. It will provide a reference for the design of compound modified asphalt mixture.

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

  • camber Deformation Property and fracture strain of flexible film made by polydimethylsiloxane
    Optical Materials, 2020
    Co-Authors: Houhu Lai, Changyou Yuan, Hui Lin
    Abstract:

    Abstract Polydimethylsiloxane (PDMS) is one of the most commonly used materials in flexible optics, stretchable electronic devices and soft micro robots/actuators. One often-used mechanical ability of PDMS film in these applications is to perform the camber Deformation, such as the joint sensor and the flexible imprinting on the non-planar surfaces. The mechanical properties of PDMS film that matter most are relationship between input force and curvature of Deformation, and the maximum received curvature that can be achieved before fracture. Therefore, this paper is committed to investigating the camber Deformation Property and fracture criteria of flexible film made by PDMS. At first, the PDMS films were fabricated with different composition ratio of curing agent and film thickness, which will lead to different mechanical properties. The Young's modulus of each film was precisely measured according to the Hooke's law. Then, the camber Deformation Property and the fracture caused by overstretch were investigated in a vacuum chamber, and the relationship of maximum received curvature versus the Young's modulus and film thickness was analyzed. At last, the distribution of Deformation and strain of the film was calculated by finite element simulation. The simulation and experimental results indicate that the PDMS film will fractured when the maximum shear elastic strain is about 27–32% (mm−1) of film thickness. The research results provide fundamental insights into the mechanical properties and practical instructions for the PDMS flexible films.