abstract rice can be cultivated in various soils but soil with heavy texture and low permeability is more appropriate for its growth than other types of soil texture. it’s assumed that existence of zeolite in soil can be effective for moisture retention and avoiding of occurrence of crack in soil. in order to investigation of the effect of zeolite on moisture status and hydraulic properties of ...

As fretting fatigue cracks are initiated at an early stage of life, the fretting fracture process is dominated by the stable growth of cracks. Hence the measurement of crack length is very important. This paper demonstrates the suitability of the DC potential drop technique for the measurement of fretting cracks. A calibration has been established for monitoring crack growth in BS L65 copper al...

A 2-dimensional, elastic-plastic finite element model has been developed to simulate plasticity induced crack closure in slanted and deflected cracks growing outside the small scale yielding (SSY) regime. The finite element model allows for contact between deformable surfaces to capture the complex contact interaction between the crack faces. Coulomb’s friction law has been used to model fricti...

BACKGROUND Crack cocaine smoking is associated with an array of negative health consequences, including cuts and burns from unsafe pipes, and infectious diseases such as HIV. Despite the well-established and researched harm reduction programs for injection drug users, little is known regarding the potential for harm reduction programs targeting crack smoking to reduce health problems from crack...

DC electric potential technique has been used to monitor crack growth in conductive materials. A constant DC current is passed through these materials and the crack length is measured through the changes in the electrical voltage at the crack mouth. However, this method is not applicable in crack growth measurement in nonconductive materials or adhesively bonded joints. For these materials, a n...

Recently, rapid advances in flexible strain sensors have broadened their application scenario monitoring of various mechanophysiological signals. Among sensors, the crack-based drawn increasing attention subtle mechanical deformation due to high sensitivity. However, early generation and propagation cracks conductive sensing layer result a narrow working range, limiting large biomechanical Here...

Imparting ductility to glass effectively counters brittleness caused by stress concentration. Spark plasma sintering of silica (SiO2) nanopowder and a silver nitrate mixture successfully dispersed (Ag) nanoparticles into SiO2 matrix. The Ag-precipitated showed crack bridging during propagation softening owing the imparted Ag. Compared with glass, exhibited fewer cone cracks suppressed radial pr...

The radial (penny-shaped) model of hydraulic fracture is considered. tangential traction on the walls incorporated, including an updated evaluation energy release rate (fracture criterion), system asymptotics and need to account for stagnant zone formation near injection point. impact incorporating shear stress construction solvers, effectiveness approximating parameters using first term crack ...

A research program on failure modes induced by spherical indenters in brittle layer structures bonded to polymeric substrates, in simulation of occlusal function in all-ceramic dental crowns, is surveyed. Tests are made on model flat and curved layers bonded onto a dentin-like polymer base, in bilayer (ceramic/polymer) and trilayer (ceramic/ceramic/polymer) configurations. All-transparent syste...

Fracture toughness of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) in both bulk and film forms after sintering at 900°C to 1200°C was measured using both single-edge V-notched beam (SEVNB) 3-point bending and Berkovich indentation. FIB/SEM slice-and-view observation after indentation revealed the presence of Palmqvist radial crack systems after indentation of the bulk materials. Based on crack length measur...