The overall objective of our work is to understand bubble growth and rise in natural marine sediments. In the first phase of our study (to mid-2003) we demonstrated that bubbles grow and rise in sediments by the mechanism of fracture. The second (current) phase has aimed to develop methods to measure the mechanical parameters that control the fracture of soft sediment; these parameters, i.e., Y...

Present study deals with the prediction of crack initiation angle for mixed mode (I/II) fracture using finite element techniques and J-Integral based approach. The FE code ANSYS is used to estimate the stress intensity factor numerically. The estimated values of SIF were incorporated into six different crack initiation angle criteria to predict the crack initiation angle. Single edge crack spec...

BACKGROUND Osteoporosis remains an underdiagnosed and undertreated major health problem. The current treatment rate for patients who have experienced at least 1 osteoporotic fracture is 20%-25%. Therefore, the Rheumatology and Internal Medicine Departments of Ochsner Clinic Foundation New Orleans implemented a mandatory rheumatology osteoporosis consult as part of preprinted admission orders fo...

Creep is an important factor of muddy submarine channel slope instability. In this study, a sub-bottom profiler was used to monitor the continuous internal change in laboratory better understand creep characteristics and mechanism The process analyzed according changes sound intensity. results indicate notable during instability process. Changes intensity time series decrease with increasing de...

BACKGROUND Magnetic resonance imaging (MRI) is highly useful for detecting diseases of the bone marrow. The sensitivity for detecting compression fracture is very high, but specificity is low for differential diagnosis between malignant and benign cases. PURPOSE To evaluate the usefulness of in-phase/opposed-phase and short TI inversion recovery (STIR) magnetic resonance imaging (MRI) of bone...

A multiphase nanostructured ZrCu-base bulk alloy which showed a unique microstructure consisting of sub-micrometer scale Zr₂Cu solid solution, nano-sized twinned plate-like ZrCu martensite (ZrCu (M)), and retained ZrCu (B2) austenite was fabricated by copper mold casting. The observation of periodic morphology evolution on the fracture surface of the multiphase nanostructured ZrCu-base alloys h...

Three-dimensional CT maximum intensity projection (MIP) can depict suture patency, extent of synostosis (ie, complete versus incomplete bone bridging), fracture extent and conspicuity, and 3D calvarial deformity as a single set of projections in children with suspected craniosynostosis or skull fracture. Three-dimensional CT MIP may provide, in only eight views, all the required information to ...

A recently introduced method of crack representation as a distribution of three-dimensional Volterra dislocations is used in conjunction with two-dimensional dislocation dynamics simulations to study the brittle to ductile transition behavior of Ferritic Steels. The crack-tip plasticity zone is represented as an array of discrete dislocations emitted from crack-tip sources. The dislocations shi...

In this study, the fracture micromechanics of Haversian cortical bone has been considered. To this effect, a two-dimensional micromechanical fibre-ceramic matrix composite tissue materials model has been presented. The interstitial tissue was modeled as a matrix and the osteon was modeled as a fibre, followed by the application of linear elastic fracture mechanics theory. The solution for edge ...

Introduction: Insulin dependant diabetes mellitus (IDDM) is an autoimmune disease that disrupts the body’s ability to produce insulin, and thus regulate the level of glucose in the blood. IDDM is associated with numerous systemic complications, including the impairment of fracture healing. Common problems include delayed unions, non-unions, and pseudoarthrosis. Previous studies conducted in our...