Magnetic relaxation and critical current density have been measured on a M gB 2 thin film in a wide region of temperature with the magnetic field up to 8 T. The irreversibility line has also been determined. It is found that the relaxation rate has a very weak temperature dependence below 1/2T c showing a clear residual relaxation rate at zero K, which cannot be easily explained as due to therm...

We use a Bi gaussmeter of micron dimensions to explore the magnetic field dependence of the magnetization relaxation rate and the critical current down to millikelvin temperatures in untwinned single crystals of YBa2Cu307 z with columnar defects. The response separates into three regimes as a function of the ratio of vortex density to columnar defect density B/B~. enhancements in both critical ...

During the flood development in an oil field, the creep characteristic of mudstone is one of the important factors causing casing damage. In this study, based on the theory of fractional order differential and taking into account the creep damage evolution rules, a fractional nonlinear creep-damage model is proposed to reflect the instantaneous deformation in loading processes and the accelerat...

Owing to lack of time translational invariance, aging soft glassy materials do not obey fundamental principles of linear viscoelasticity. We show that by transforming the linear viscoelastic framework from a real time domain into an effective time domain, wherein the material clock is readjusted to account for evolution of relaxation time, the soft glassy materials obey effective time translati...

Bone exhibits rate-dependent failure behavior, suggesting that viscoelasticity is a factor in the damage and fracture of bone. Microdamage initiates at scales below the macroscopic porosity in bone, and, as such, is affected by the intrinsic viscoelasticity of the bone tissue. The viscoelasticity of the bone tissue can be measured by nanoindentation and recording the creep behavior at constant ...

In the Present study, attempt will be made to propose a new method for prediction of long-term essential creep of concrete utilizing some short-term creep tests under high temperature. To do so, regarding the similarities between essential creep of concrete and creep in viscoelastic materials, the time–temperature equivalence relation in viscoelastic materials is evaluated for concrete. This re...

We report on studies of the dwell fatigue crack growth (FCG) behavior commercial pure titanium (CP-Ti) TA2 weld joints at 25 °C and 200 °C. Taking into account effects load ratio temperature, impact FCG associated fracture mechanism are clearly demonstrated. Meanwhile, in order to illustrate creep–fatigue interaction, finite element simulations also performed analyze evolution stress strain fie...

Introduction: Integrity and function of articular cartilage depends directly on networks of collagen fibrils that resist tension and embed the water and matrix resulting in a nonlinear, nonhomogeneous and anisotropic tissue. At the superficial zone, the fibrils are parallel to the articular surface whereas they are rather random in the transitional zone and perpendicular in the deep zone anchor...

Accurate predictions of the amount and the rate of long- term deformation of reinforced soils under an applied load are important key issue in geotechnical engineering, in which the deformation of soil develops with time at a state of constant effective stress. Since geosynthetic is generally considered creep sensitive therefore, evaluation of creep behavior of geosynthetic reinforced soil (GRS...