Carefully designed indentation creep experiments and detailed finite-element computations were carried out in order to establish a robust and systematic method to extract creep properties accurately during indentation creep tests. Samples made from an Al–5.3mol%Mg solid-solution alloy were tested at temperatures ranging from 573 to 773K. Finite-element simulations confirmed that, for a power-la...

The reservoir water level in the Three Gorges Reservoir (TGR) of Yangtze River is adjusted between 145 m and 175 throughout year. landslide below bears periodic dynamic seepage pressure on basis original steady-state pressure. In process rising levels particular, effective stress sliding zone soil line reduced, shows an unloading state. order to study creep characteristics landslides a area, di...

We investigate the spatial pattern of surface creep and off-fault deformation along the southern segment of the San Andreas Fault using a combination of multiple interferometric synthetic aperture radar viewing geometries and survey-mode GPS occupations of a dense array crossing the fault. Radar observations from Envisat during the period 2003–2010 were used to separate the pattern of horizonta...

Reticulated nickel foams were alloyed with chromium by pack-chromizing, resulting in Ni–Cr foams with 9–32 wt.% Cr and 2.6–3.5% relative density. The oxidation resistance at 1000 ◦C of the Ni–Cr foams and the corresponding bulk Ni–Cr alloys is the same, provided the foam’s higher surface area is taken into account. The foam compressive yield stress at ambient temperature is in agreement with mo...

ob ps est la densite en dislocations-vis mobiles, D le coefficient d’autodiffusion, a le nombre d’atomes parcellule unitaire, h le vecteur de Burgers, c(,, le parametre reticulaire et I la distance moyenne entre les trans. Dans le but de comparer oette relation aux r&&tats experimentaux on a determine la loi de variation de ps avec la tension appliquee pour un alliage Fe + 3.0 oA Si. On a obten...

We study the internal dynamical processes taking place in a granular packing below yield stress. At all packing fractions and down to vanishingly low applied shear, a logarithmic creep is observed. The experiments are analyzed using a viscoelastic model which introduces an internal, time-dependent, fluidity variable. For all experiments, the creep dynamics can be rescaled onto a unique curve wh...

We study the behavior of two one-dimensional sandpile models with two different particle sizes in dependence on the size dispersion and on the difference in the surface creep between the two types of particles. We investigate the phase space and find several types of particle segregation that occur: two oppositely totally segregated states, a striped state, and two oppositely partially segregat...

Bulk samples of Pd41Ni10Cu29P20 glass were tested at constant true stress s20–636 MPad in compression at 550, 555, and 565 K to study the transition from steady-state creep at low stress to deformation-induced softening at high stress. In the high-stress regime strongly accelerating creep was observed. All deformation was homogeneous. The activation volume was 106 Å3. The isoconfigurational act...

The creep anisotropy of nickel-base superalloys with a cubic y' morphology is studied with a composite model. Creep curves and the internal stress distribution in the microstructure under [Oll] load are calculated with a Finite Element Procedure. Analytical considerations are made for arbitrary loading directions. y' cubes (with their interfaces aligned parallel to (001) planes) under [OOl] loa...

A set of analytical models based on engineering beam analysis is developed to predict creep behavior of cellular materials over a broad range of relative density. Model predictions, which take into account the presence of mass at strut nodes and consider different possible deformation mechanisms and foam architectures, are compared to experimental creep results for a replicated nickel-base foam...