Abstract. Viscous flow in ice is often described by the Glen law – a non-Newtonian, power-law relationship between stress and strain rate with exponent n ? 3. The attributed to grain-size-insensitive dislocation creep; however, laboratory field studies demonstrate that deformation can be strongly dependent on grain size. This has led hypothesis at sufficiently low stresses, controlled boundary ...

In this paper a new anisotropic model for time-dependent behaviour of soft soils is presented. The formulation is based on a previously developed isotropic creep model, assuming rotated Modified Cam Clay ellipses as contours of volumetric creep strain rates. A rotational hardening law is adopted to account for changes in anisotropy due to viscous strains. Although this will introduce some new s...

A constitutive law for rock behaviors including the brittle, transient and steady-state behaviors is derived to recognize the temporal seismicity patterns on surface displacement or prior and subsequent to mainshocks, and formulated as the relaxation modulus (i.e., the ratio of stress to strain) following a temporal power-law relaxation. This constitutive law is transformable into the empirical...

-The steady-state creep deformation behavior of a cast two phase gamma TiA1 alloy having the composition Ti-48AI 1Nb (a t . ° ) has been studied. Tension creep tests using the stress increment technique (a~ < cr 2 < or3) were conducted over the temperature range of 704-850°C at constant initial applied stress level of 103.4-241.3 MPa. The activation energy for creep over the temperature and str...

Recent investigations into convection in Europa’s ice shell have been based on nonNewtonian (stress-dependent) or Newtonian (stress-independent) viscosity for water ice. However, despite the wide use of Newtonian convection, experimentally observed water ice flow is non-Newtonian, and analysis of stability against convection of the ice shell using updated flow laws has been only performed for n...

Dynamic and creep behavior of 80In15Pb5Ag and 50Sn50Pb were studied isothermally over nine decades of time and frequency. 80In15Pb5Ag was examined at 26, 21, and 50 °C, and 50Sn50Pb was examined at 21 °C. Viscoelastic behavior was observed at strains less than 10 as a function of temperature and time/frequency. At the small strain used in the study, the alloys exhibit linear viscoelasticity rat...

Commercial zirconium carbide (ZrC) powder is consolidated by Spark Plasma Sintering (SPS). Processing temperatures range from 1650 to 2100 °C. Specimens with various density levels are obtained when performing single-die SPS at different temperatures. Besides the single-die tooling setup, a double-die tooling setup is employed to largely increase the actual applied pressure to achieve higher de...

We consider numerically the depinning transition in the randomfield Ising model. Our analysis reveals that the three and four dimensional model displays a simple scaling behavior whereas the five dimensional scaling behavior is affected by logarithmic corrections. This suggests that d = 5 is the upper critical dimension of the depinning transition in the random-field Ising model. Furthermore, w...

This paper investigates the influence of stress level and hygrothermal conditions on creep/recovery behaviour three high-grade composites made GreenPoxy flax hemp fibres. The results show that levels instantaneous, time-delayed residual strains increase with applied load severity environment. materials are higher in creep phase than recovery phase. A stiffening effect is also observed during po...