Fracture asperities interlock or break during stick slip and ride over each other stable sliding. The evolution of fracture the transition between sliding has attracted less attention, but is important to predict behaviour. Here, we conduct a series direct shear experiments on simulated fractures in homogeneous polycarbonate examine stage. Our results show that stage occurs stages progressive r...

In this work, fracture behavior of multilayered unidirectional graphite/epoxy composite (T800/3900-2) materials is investigated. Rectangular coupons with a single-edged notch are studied under geometrically symmetric loading configurations and impact loading conditions. The notch orientation parallel to or at an angle to the fiber orientation is considered to produce mode-I or mixed-mode (mode-...

Stress damage of shale during the uniaxial loading process will cause the change of permeability. The study of stress sensitivity of shale has focused on the influence of confining pressure on shale permeability and the change of shale permeability during the loading process of axial stress is lacking. The permeability of gas shale during loading process was tested. The results show that shale ...

the cracked brazilian disc (cbd) specimen is widely used in order to determine mode-i/ii and mixed-mode fracture toughness of a rock medium. in this study, the stress intensity factor (sif) on the crack-tip in this specimen is calculated for various geometrical crack conditions using the extended-finite element method (x-fem). this method is based upon the finite element method (fem). in this m...

DESCRIPTION A 26-year-old right-handed man presented with pain in his right ring finger after a physical altercation. Deformity and swelling in the distal interphalangeal (DIP) joint was evident. There was no open injury or sensory loss; flexion and extension were limited secondary to pain. X-ray showed posterior dislocation of the ring finger DIP joint without fracture.

Fracture mode of ductile solids can vary depending on the history of stress state the material experienced. For example, ductile plates under remote in-plane loading are often found to rupture in mode I or mixed mode I/III. The distinct crack patterns are observed in many different metals and alloys, but until now the underlying physical principles, though highly debated, remain unresolved. Her...

To solve the safety hazard of a buried gas pipeline caused by subsidence mined-out area, three-dimensional model in area was established using geological parameters and finite-element software ABAQUS. The effects friction coefficient pipe soil, coal-seam dip angle, horizontal angle on mechanical behavior under varying widths goaf were investigated. results indicate that maximum equivalent stres...

The records of multiple Love and Rayleigh waves of the Alaska earthquake of 1964 were recovered from the 30-100 seismograph records at the WWSSN stations. The seismograms were equalized to a propagation distance of 9rr/2 (equivalent to G5 and R5 at • -r/2). These seismograms were compared with synthetic seismograms for radiation pattern and amplitude to estimate various source parameters. The s...

The construction of the Three Gorges Reservoir (TGR) has considerably increased landslide hazard due to 30-m annual fluctuating reservoir water level. In this study, influence permeability on stability dual-structure with different deposit-bedding interface (DBI) morphology were comprehensively investigated. A database including 560 recorded landslides was built for statistical analysis. DBI mo...

In this study, the fracture propagation characteristics and associated mechanisms of coal are investigated by using computed tomography (CT) observation image-based simulation. The spatial distribution structural morphology original fractures provide significant influences on failure behavior fractured coal. with small dip angles large openings result in more-obvious closure stable stages, whil...