Corresponding Author: Mirsayar, M.M. Department of Civil Engineeing, Texas A&M University, College Station, TX 77843-3136, USA Email: [email protected] Abstract: Zirconia/veneer bilayered components are extensively used in dental restoration technology to improve resistance of tooth’s surface from decay. The direction of the fracture propagation at the interface of zirconia and veneer is invest...

Utilization of hydraulic-fracturing technology is dramatically increasing in exploitation of natural gas extraction. However the prediction of the configuration of propagated hydraulic fracture is extremely challenging. This paper presents a numerical method of obtaining the configuration of the propagated hydraulic fracture into discrete natural fracture network system. The method is developed...

rails fracture by the growth of fatigue crack or critical crack is one of the prevalent defects in railway. the rail fracture, failure and stress analysis should be studied in order to prevention of rail fracture. in this paper, new formulation of contact stress for two rolling bodies is presented, where the results are closed to the hertz stress formulation. moreover, stress analysis is done b...

Potassium leakage is one of the first events that appear after photosensitization of red blood cells. This event may subsequently lead to colloid osmotic hemolysis. The aim of our study was to determine which photodynamically induced damage is responsible for increased membrane cation permeability. This was done by studying the effect of dimethylmethylene blue (DMMB)-mediated photodynamic treat...

Poro-thermo-mechanical processes and mineral precipitation/dissolution change the fracture aperture and thus affect the fluid flow pattern in the fracture. In this paper, we study this phenomenon by further development and application of a three-dimensional thermo-poro-mechanical model to include silica dissolution-precipitation effects. The solid mechanics aspect of the problem is treated usin...

BACKGROUND Restraint stress induces permeability changes in the rat small intestine but little is known of the ultrastructural events leading to defects of the paracellular sealing or of the short term evolution of these alterations. METHODS In the present study, we performed transmission electron microscopy in the terminal ileum perfused with lanthanum after two hours of immobilisation stres...

The structure of caprocks is often greatly altered by different scales faults or fissures in long-term geological tectonic evolution, and the sealing performance may be deteriorated. In this paper, a simplified model characterized as multilayered sandstone fault-bearing extracted from Shuang 6 underground gas storage located Liaohe oilfield was established. Different fault geometry (e.g., lengt...

The initiation, expansion, and penetration of microscopic cracks in rock is the macroscopic manifestation creep. This paper investigates mechanical creep characteristics fracture evolution processes masses with different angles, lengths, bridge dip angles. Single fractures, dual parallel groups are considered. approach comprises discrete element simulation based on continuum mechanics, utilizin...

[1] A mechanistic model is presented to describe closure of a fracture mediated by pressure solution; closure controls permeability reduction and incorporates the serial processes of dissolution at contacting asperities, interfacial diffusion, and precipitation at the free face of fractures. These processes progress over a representative contacting asperity and define compaction at the macrosco...

For the characteristics of horizontal fractures in shallow low-permeability oil layers after hydraulic fracturing in multilayer reservoirs, horizontal fractures are taken equivalent to an elliptical cylinder with the reservoir thickness using the equivalent permeability model; then, upon the elliptic seepage theory, the seepage field which has led by a vertical well with horizontal fractures is...