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36 results for “Stress fracture”
The hydro-mechanical properties of fracture intersections: pressure dependant permeability and effective stress law
<p>The present repository includes the raw permeability data presented in the manuscript submitted for publication in Journal of Geophysical Research: Solid Earth entitled <em>The hydro-mechanical properties of fracture intersections: pressure-dependant permeability and effective stress law.</em></p> <p>The repository is presented as compressed folders named after the Figures of the manuscript where the data is presented. </p>
Awareness of fifth metatarsal stress fractures among soccer coaches in Japan: A cross-sectional study
<p>Although a fifth metatarsal stress fracture is the most frequent stress fracture in soccer players, awareness of fifth metatarsal stress fractures among soccer coaches is unclear. Therefore, we performed an online survey of soccer coaches affiliated with the Japan Football Association to assess their awareness of fifth metatarsal stress fractures. A total of 150 soccer coaches were invited for an original online survey. Data on participants' age, sex, types of coaching licence, coaching category, types of training surface, awareness of fifth metatarsal stress fractures, and measures employed to prevent fifth metatarsal stress fractures were collected using the survey. Data from 117 coaches were analysed. Eighty-seven of the 117 coaches were aware of fifth metatarsal stress fractures; however, only 30% reported awareness of preventive and treatment measures for fifth metatarsal stress fractures. Licensed coaches (i.e., licensed higher than level C) were also more likely to be aware of fifth metatarsal stress fractures than unlicensed coaches were. Furthermore, although playing on artificial turf is an established risk factor for numerous sports injuries, soccer coaches who usually trained on artificial turf were more likely to be unaware of the risks associated with fifth metatarsal stress fractures than coaches who trained on other surfaces were (e.g., clay fields).<strong> </strong>Soccer coaches in the study population were generally aware of fifth metatarsal stress fractures; however, most were unaware of specific treatment or preventive training strategies for fifth metatarsal stress fractures. Additionally, coaches who practised on artificial turf were not well educated on fifth metatarsal stress fractures. Our findings suggest the need for increased awareness of fifth metatarsal stress fractures and improved education of soccer coaches regarding injury prevention strategies. </p>
Repository of "How Stress Biaxiality Controls Crack Morphology and Apparent Fracture Energy of Dikes and Sills"
<p>This repository contains the dataset of the future publication "How Stress Biaxiality Controls Crack Morphology and Apparent Fracture Energy of Dikes and Sills". It contains:</p> <ul> <li>1 file recapitulating sample dimensions and informations on the tests.</li> <li>12 “raw” mechanical results of experiments on Carrara marble (6 WST — 3 dry/3 saturated tests, 6 MRT — 3 dry/3 saturated tests) with minimal filtering.</li> <li>12 “computed” mechanical results of experiments on Carrara marble (6 WST — 3 dry/3 saturated tests, 6 MRT — 3 dry/3 saturated tests) with the use of the compliance method.</li> <li>2 compressed and stitched back-scattered SEM scans imaging the crack tip in xz direction after crack arrest on WST and MRT.</li> <li>5 stitched back-scattered SEM scans imaging the crack in yz direction on WST at 20, 40, 60 mm MRT at 10, 25 mm of crack propagation.</li> </ul> <p>For more details and information about the dataset, do not hesitate to contact me at antoine.guggisberg@epfl.ch</p> <p> </p>
Dataset for article "Prediction of thermal shock induced cracking in multi-material ceramics using a stress-energy criterion" published in Engineering Fracture Mechanics
<p>Dataset contains graphical outputs of the numerical analysis performed using Finite element method in finite elements software Ansys Mechanical. It contains also photoes of the tested specimens. Further, material data used for the numerical analysis and measured by authors are included in the csv file and all necessary input codes for the FE system Ansys creating data for graphs in the publication are provided in the subfolder "Models-Ansys" within "Data" directory.</p> <p> </p>
Relating hydro-mechanical and elastodynamic properties of dynamically-stressed tensile-fractured rock in relation to fracture aperture and contact area
<p>We exploit nonlinear elastodynamic properties of fractured rock to probe the micro-scale mechanics of fractures and understand the relation between fluid transport and fracture aperture and area, stiffness proxy, under dynamic stressing. Experiments are conducted on rough, tensile-fractured Westerly granite specimen subject to triaxial stresses. Fracture permeability is measured from steady-state fluid flow with deionized water. Pore pressure oscillations are applied at amplitudes ranging from 0.2 to 1~MPa at 1~Hz frequency. During dynamic stressing we transmit acoustic signals through the fracture using an array of piezoelectric transducers (PZTs) to monitor the evolution of fracture interface properties. We examine the influence of fracture aperture and contact area by conducting measurements at effective normal stresses of 10, 12.5, 15, 17.5, and 20~MPa. Additionally, the evolution of contact area with stress is characterized using pressure sensitive film. These experiments are conducted separately with the same fracture and they map contact area at stresses from 9 to 21~MPa. The resulting `true' area of contact measurements made for the entire fracture surface and within the calculated PZT sensor footprints, numerical modeling of Fresnel zone. We compare the elastodynamic response of the the fracture using the stress-induced changes ultrasonic wave velocities for a range of transmitter-receiver pairs to image spatial variations in contact properties, which is informed by fracture contact area measurements. These measurements of the nonlinear elasticity are related to the fluid-flow, permeability, in response to dynamic stressing and similar comparisons are made for the slow-dynamics, recovery, of the fracture interface following the stress perturbations.</p>
The stress- and fluid-pressure-driven frictional slip data for variably roughened fractures in Gonghe granite
<p class="Abstract"><a name="_Hlk122089471"></a><span>We explore</span><span> the impacts of stress- and fluid-pressure-driven frictional slip on variably roughened fractures in Gonghe granite (Qinghai province, China). Slip is on an inclined fracture under simple triaxial stresses with concurrent fluid throughflow allowing fault permeability to be measured both pre- and post-reactivation. Under stress-drive, smooth faults are first slip-weakening and transition to slip-strengthening with rough faults slip-strengthening, alone. A friction criterion accommodating a change in friction coefficient and fault angle is able to fit the data of stable-slip and stick-slip. Under fluid-pressure-drive, excess pore pressures must be significantly larger than average pore pressures suggested by the stress-drive-derived failure criterion. This overpressure is conditioned by the heterogeneity of the pore pressure distribution in radial flow on the fault and related to the change in permeability</span><span>. Fault roughness impacts both the coefficient of friction and the permeability and therefore exerts important controls in fluid-injection-induced earthquakes.</span><span> </span><span>The results potentially improve our ability to assess and mitigate the risk of injection-induced earthquakes in EGS.</span><span> </span></p>
Simulation data for paper "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan"
<p>Supplementary files for Dubinya, Tikhotskiy paper entitled "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan" prepared for submission to Journal of Geophysical Research: Solid Earth.</p> <p> </p> <p>File "Initial data on fractures.csv" contains initial data on conductivity of natural fractures, their deoths and spatial orientations</p> <p>Files "Unit N, (un)limited friction" contain results of Monte-Carlo simulations completed based on data from fractures from N-th interval. Friction coefficient is varied either between 0 and 1 (unlimited friction), or 0.4 and 0.6 (limited friction).</p>
A Noninferiority RCT Comparing Operative vs Nonoperative Treatment for ER-stress Positive Weber-B Unimalleolar Fractures
ClinicalTrials.gov study NCT01758796. IPD Sharing: NO. Countries: 1. Publications: 1.
Photobiomodulation Therapy for the Treatment of Lower Extremity Stress Fractures in a Military Training Setting
ClinicalTrials.gov study NCT05843864. IPD Sharing: NO. Countries: 1. Publications: 7.
Data for: Tuning and validation of a virtual mechanical testing pipeline for condylar stress fracture risk assessment in Thoroughbred racehorses
Open the record for dataset details and reuse information.
Awareness of fifth metatarsal stress fractures among soccer coaches in Japan: A cross-sectional study
Open the record for dataset details and reuse information.
The stress- and fluid-pressure-driven frictional slip data for variably roughened fractures in Gonghe granite
Open the record for dataset details and reuse information.
Imaging elastodynamic and hydraulic properties of in-situ fractured rock: An experimental investigation exploring effects of dynamic stressing and shearing
<p>We describe laboratory experiments to elucidate the relationship between nonlinear elasticity and permeability evolution in fractured media subjected to local stress perturbations. This study is part of an effort to image fluid pathways and fracture properties using active-source acoustic monitoring during fluid injection and shear of rough fractures. Experiments were conducted with L-shaped samples of Westerly granite fractured in-situ under tri-axial conditions with deionized water subsequently circulated through the resulting fractures. After in-situ fracturing, we separately imposed oscillations of the applied normal stress and pore pressure with amplitudes ranging from 0.2 to 1 MPa and frequencies from 0.1 to 40 Hz. During these dynamic perturbations an array of piezoelectric transducers continuously transmitted ultrasonic pulses across the fracture to monitor the evolving elastic response. We interpret the resulting evolution of elastic wave properties in the context of elastic nonlinearity and relate the estimated nonlinearity parameters to the relative change in permeability of the fractured media. Fracture roughness is then altered in-situ by shearing, with the generation of breccia and wear products. We document the evolution of permeability and fracture contact stiffness as a function of dynamic stressing and shear offset and discuss our findings in relation to fractures in Earth's crust.</p>
Comparison of planar digital radiography and helical standing computed tomography for assessment of condylar stress fracture risk in Thoroughbred racehorses
<p class="MsoNormal"><strong>Background</strong>: Catastrophic injury has a low incidence but leads to the death of many Thoroughbred racehorses.</p> <p class="MsoNormal"><strong>Objectives</strong>: To determine sensitivity, specificity, and reliability for condylar stress fracture risk assessment from fetlock digital radiographs (DR) and standing computed tomography (sCT).</p> <p class="MsoNormal"><strong>Study design</strong>: Controlled <em>ex vivo</em> experiment.</p> <p class="MsoNormal"><strong>Methods</strong>: A blinded set of thoracic limb fetlock DR and sCT images were prepared from 31 Thoroughbreds. Four observers evaluated the condyles and parasagittal grooves (PSG) of the third metacarpal bone for the extent of dense bone and lucency/fissure and assigned a risk assessment grade for condylar stress fracture. Sensitivity and specificity for detection of subchondral structural changes in the condyles and PSG and for risk assessment for condylar stress fracture were determined by comparison with a reference. Agreement between observers and the reference assessment and reliability between observers were determined. Intra-observer repeatability was also assessed.</p> <p class="MsoNormal"><strong>Results</strong>: Sensitivity for detection of structural change was lower than specificity for both imaging methods and all observers. For horses with normal risk, observer assessment often agreed with the reference. Sensitivity for risk assessment was lower than specificity for all observers. For horses with a high risk of injury, observers generally underestimated risk. Diagnostic sensitivity of risk assessment was improved with sCT imaging, particularly for horses with elevated risk of injury. Assessment repeatability and reliability was better with sCT than DR.</p> <p class="MsoNormal"><strong>Main limitations</strong>: The <em>ex vivo</em> study design influenced DR image sets.</p> <p class="MsoNormal"><strong>Conclusions</strong>: Risk assessment through screening with diagnostic imaging is a promising approach to improve injury prevention in racing Thoroughbreds. Knowledge of sensitivity and specificity of fetlock lesion detection provides the critical guidance needed to improve screening programs for racehorses. We found improved detection of MC3 subchondral structural change and risk assessment for condylar stress fracture with sCT <em>ex vivo</em>.</p>
Stress-induced flow channelization in three-dimensional fractured layered rocks
<p>The manuscript data for the stress-induced flow channelization in three-dimensional fractured layered rocks.</p>
Numerical results data of 'Impact of Injection Pressure and Polyaxial Stress on Hydraulic Fracture Propagation and Permeability Evolution in Greywacke: Insights from Discrete Element Models of a Laboratory Test'
<p>Numerical results data of '<strong>Impact of Injection Pressure and Polyaxial Stress on Hydraulic Fracture Propagation and Permeability Evolution in Greywacke: Insights from Discrete Element Models of a Laboratory Test</strong>'</p>
Benchmark tests imply the explicit correlation between chain-like stress transfer and interevent violation of Gutenberg-Richter law null hypothesis in fracturing process [DATA]
<p>Data and metadata for article: Benchmark tests imply the explicit correlation between chain-like stress transfer and interevent violation of Gutenberg-Richter law null hypothesis in fracturing process</p>
PRCT-study of Different Non-operative Treatment Protocols of ER-stress Negative Weber-B Unimalleolar Ankle Fractures.
ClinicalTrials.gov study NCT01758835. IPD Sharing: NO. Countries: 1. Publications: 1.
Study of Teriparatide in Stress Fracture Healing
ClinicalTrials.gov study NCT04196855. IPD Sharing: NO. Countries: 1. Publications: 1.
Detecting and Assessing Leg and Foot Stress Fractures Using Photon Counting CT
ClinicalTrials.gov study NCT06024798. IPD Sharing: NO. Countries: 1. Publications: 15.
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