In order to study the variation law of shear frictional characteristics steel pipe jacking and sand interface under different working conditions, stress–strain curve between five particle sizes normal stress slurry lubrication conditions was measured by using a direct device, internal friction angle, coefficient cohesion pipe–soil were calculated regression analysis. The test results show that ...

Anelasticity, as suggested by Zener / I / in 1948, gives rise to internal friction which is independent of the strain amplitude. The internal friction which increases with an increase of strain amplitude was explained by Koehler /2/ and Granato and Liicke /3/ in terms of vibration string and unpinning of dislocations. Early in 1949, ~d /4, 5/ observed in slightly cold-worked dilute aluminium-co...

Engineering properties of pearl millet varieties (Pusa composite 443, Pusa 701, Pusa1201 and Pusa1801) were evaluated at varying moisture content (10-25% wb). A significant varietal difference was found on studied properties. GMD, Surface area, thousand grain mass, the angle repose, porosity, internal coefficient friction, static friction (Poly, GI, MS Al) increased linearly with increase in wi...

Flowability - as measured by hopper discharge rate, angle of repose and Carr's index (CI) - of surface modified microcrystalline cellulose granules was investigated experimentally. Three-dimensional simulations of the granule flow were performed, using the discrete element method (DEM), including either sliding and rolling friction or sliding friction and cohesion in the model. Granule surface ...

In order to reduce the power consumption of screw conveyor and improve productivity, this study investigated such mechanical characteristics rubbed maize straw as coefficient sliding friction, angle repose, internal friction coefficient, cohesion, flow function value compressible with respect its moisture content density. An experiment was designed consists a characteristic test-bed, direct she...

The shear strength parameters—the cohesion and the internal friction angle—are important parameters in calculating of soil, which is a mechanical property reflecting resistance soil to shearing. This article embeds angle results sandy loam measured using direct test relying on drawing Mohr–Coulomb line. Beside parameters, this contains colour tested at different moisture contents, spectrophotom...

To improve the jetting performance of liquid metals, an electromagnetic micro-jetting (EMJ) valve that realizes drop-on-demand (DOD) jetting while not involving any valve core or moving parts was designed. The influence of the lead angle of the nozzle on the jetting of liquid metal gallium (Ga) was investigated. It was found that the Lorentz force component parallel to the nozzle that jets the ...

The motion of a ruck in a rug is used as an analogy to explain the role of dislocations in crystalline solids. We take literally one side of this analogy and study the shape and motion of a bump, wrinkle or ruck in a thin sheet in partial contact with a rough substrate in a gravitational field. Using a combination of experiments, scaling analysis and numerical solutions of the governing equatio...

Friction stir processing (FSP) has been developed on the principles of friction stir welding (FSW) as an effective and efficien new method for grain refinement and microstructural modification, providing intense plastic deformation as well as higher strain rates than other conventional severe plastic deformation methods. FSP produces an equiaxed homogeneous microstructure consisting of fine gra...

failure of the quay walls due to earthquakes results in severe economic loss. because of hazards threatening such inexpensive nodes of national and international transportation networks, seismic design of quay walls is still an evolving topic in marine structural engineering. this study investigates the sensitivity of the gravity-type quay wall stability respect to uncertain soil and seismic pr...