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21 results for “fracture mechanics”
Mechanical Properties and Fracture Characterization of Additive Manufacturing Polyamide 12 After Accelerated Weathering
<p>A dataset for the publication: T. Puttonen, M. Salmi, J. Partanen, Mechanical Properties and Fracture Characterization of Additive Manufacturing Polyamide 12 After Accelerated Weathering, 2021.</p> <p>The paper studies the mechanical properties and fracture mechanics of Additive Manufacturing (AM) polyamide 12 (PA12) in two build orientations exposed to a 1500-hour accelerated weathering cycle (ISO-4982-3) followed by tensile testing (ISO-527). Fracture surfaces of X and Z build orientation AM PA12 and X build orientation AM glass-filled PA12 were studied with scanning electron microscopy. The tested AM materials were PA12, glass-filled PA12, and carbon-reinforced PA12. The reference materials cut from sheet included glass-filled and molybdenum disulfide-filled PA66, PMMA, ABS, PC, and cast PA12.</p> <p>The dataset contains:</p> <p>- Full tensile test results in PDF format, and individual CSV files</p> <p>- A python script for tensile CSV data plotting</p> <p>- Overall pictures of all samples after tensile tests</p> <p>- 3D models and drawings for tensile samples, manufacturing files for a custom QUV holder assembly</p> <p>- SEM images of fracture surfaces for AM polyamide 12 (SLS), X and Z build orientation, and glass-filled polyamide 12 (SLS) in the X build orientation</p> <p> </p> <p>Version history:</p> <p>1.0.1: A partially corrupted version of the tensile test results PDF file replaced (Tensile_test_results.pdf)</p>
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>
Accompanying dataset for the paper "Mesh Density and Geodesic Tortuosity in Planar Triangular Tesselations Devoted to Fracture Mechanics"
<h2>Contributions</h2> <ul> <li>Author #1 is the major contributor to the paper writing. Author #1 has created most of the Figures in the paper and has provided all the results concerning the geodesic tortuosity of planar triangular meshes.</li> <li>Author #2 and Author #3 have provided the results concerning the density of planar triangular meshes.</li> </ul> <h2>Funding sources</h2> <ul> <li>This work was funded by the French Institute for Radiation Protection and Nuclear Safety (IRSN) and the University of Montpellier, France.</li> </ul> <h2>Data structure and information</h2> <p>All the results and figures presented in the paper have been obtained with a python script available in the <code>workflows</code> folder. </p> <p>Data files processed by that script are provided in the <code>data</code> folder. The pickle files <code>t_{nb}.pkl</code> inside the <code>data/pkl</code> folder contain lists of tortuosity values computed on a <code>gmsh</code> mesh for several paths containing various number of edges (<code>nb</code>).</p> <p><code>pkl</code>files are produced via a function call to <code>main.py:comp_real_tortuosities(nb)</code></p> <h2>Data structure and information</h2> <ul> <li><code>workflows/</code> - folder containing plotting scripts<ul> <li><code>reproduce.sh</code> - bash script launching python and compressing figures</li> <li><code>main.py</code> - python script for figure creation.</li> <li><code>/utils</code> - folder containing additional python scripts for figures creation</li> <li><code>/figures</code> - folder containing the figures produced by the python script</li> </ul> </li> <li><code>data/</code> - data folder<ul> <li><code>gmsh</code> - folder containing mesh in gmsh information</li> <li><code>pkl</code> - folder containing the pickled vectors "t_{nb}.pkl".</li> </ul> </li> </ul> <h2>Paper Description</h2> <p>In fracture mechanics, the mesh sensitivity is a key issue. It is particularly true concerning cohesive volumetric finite element methods in which the crack path and the overall behavior are respectively influenced by the mesh topology and the mesh density. Poisson-Delaunay tessellations parameters, including the edge length distributions, were widely studied in the literature but very few works concern the mesh density and topology in Delaunay type meshes suitable for finite element simulations, which is of crucial interest for practical use.Starting from previous results concerning Poisson-Delaunay tessellations and studying in detail the Lloyd relaxation algorithm, we propose estimates for the probability density functions of the edge length and triangle top angles sets. These estimates depend both on the intensity of the underlying point process and on an efficiency index associated to the global quality of the mesh. The global and local accuracies of these estimates are checked for various standard mesh generators. Finally the mesh density and geodesic tortuosity are estimated for standard random or structured triangular meshes typically used in finite element simulations.These results provide practical formulas to estimate bias introduced by the mesh density and topology onthe results of cohesive-volumetric finite element simulations.</p>
Assessing-the-role-of-non-linear-contact-mechanics-for-flow-in-fractures---experimental_data
<p>Data to reproduce pressure response spectra from a number of harmonic measurements shown in "Assessing the role of non-linear contact mechanics for<br> flow in fractures"</p> <p><strong>Note:</strong> Data of AFR, BHR and TER has been extracted from papers published by authors others than the ones mentioned in the author list. The publications are referenced in the .txt files and the paper mentioned above.</p>
Data for: Wall fracturing versus mechanical instability as competing intrusion mechanisms of dikes: Insights from laboratory experiments
<p class="MsoNormal"><span>Igneous dike intrusion is a primary crust-forming process. Understanding its governing mechanism is very crucial for studies related to the lithosphere. We performed liquid injection experiments in the laboratory with two new crust analog model materials, i) ultrasound transmission gel (<em>USTG</em>) and gel wax. To conduct a properly scaled model experiment, we test their rheology using an <em>Anton Paar M302e</em> rheometer. The measured rheological data were presented in this present data repository. We identified three mechanisms from our laboratory studies: a) fracturing, b) interfacial instability, and c) hybrid, i.e., a combination of both. These three mechanisms give rise to distinct 3D geometries. To quantitatively analyze their geometric shapes, we performed fractal, aspect ratio, and skewness-kurtosis analysis. The procedure and the data collected during the analysis were also presented in the current data repository. </span></p>
Data for: Wall fracturing versus mechanical instability as competing intrusion mechanisms of dikes: Insights from laboratory experiments
Open the record for dataset details and reuse information.
Data Accompanying "Fracturing process of concrete under uniaxial and triaxial compression: insights from in-situ x-ray mechanical tests"
<p>These are the datasets analysed in "Fracturing process of concrete under uniaxial and triaxial compression: insights from <em>in-situ</em> x-ray mechanical tests" by Stamati <em>et. al.</em> (submitted on June 2020 in Cement and Concrete Research)</p> <p>The datasets contain the reconstructed x-ray 3D images of selected tests and the corresponding DVC analysis.</p> <p>Note that details regarding the DVC analysis can be found in the paper.</p> <ul> <li>Each folder contains a separate test; uniaxial compression ("<em>C-02"</em>) and triaxial compression at 5MPa ("<em>TX5-01"</em>), 10MPa ("T<em>X10-01</em>") and 15MPa ("<em>TX15-01</em>") confining pressures.</li> <li>For each test, folder 01 contains the first scan, where 01 is the reference state for the DVC analyis. Folder 01 also contains the image of the labelled largest aggregates used for the discrete DVC. Folrders 02-XX contain the scans at intermediate loading steps and the corresponding DVC analysis; "<em>reg</em>" contains the registration result in downscaled 2-binning images. "<em>ddic</em>" contains the discrete DVC computation. "<em>ldic</em>" contains the local DVC computation, before and after the merge and filtering of the grid and discrete DVC fields. "<em>strains</em>" contains the strain fields coming from the corrected merged DVC field.</li> <li>Folder "<em>stressStrain</em>" contains the stress-strain curves measured during the tests after subtracting the displacement corresponding to the loading system.</li> <li>Folder "<em>doubleScanUniaxial</em>" contains the two reconstructed images of the "repeated scan" of the uniaxial tests, from which the DVC measurement uncertainties were evaluated.</li> </ul>
Data sets for 'Mechanical Compliance of Individual Fractures in a Heterogeneous Rock Mass from Production-type Full-waveform Sonic Data', submitted to JGR: Solid Earth
<p>Synthetic and field FWS data sets are supplied for validation of proposed methods for compliance estimation of individual fractures. Each zip contains ‘ReadMe.txt ‘, which illustrates the files and corresponding parameters. More details about the setup in the submitted paper ‘Mechanical Compliance of Individual Fractures in a Heterogeneous Rock Mass from Production-type Full-waveform Sonic Data’.</p>
6th International Conference "Fracture Mechanics of Materials and Structural Integrity" (June 3–6, 2019, Lviv, Ukraine)
<p><strong>12.06.2019</strong></p> <p>03–06 червня 2019 року у м. Львові відбулася 6-та Міжнародна конференція з механіки руйнування матеріалів і цілісності конструкцій (“Fracture Mechanics of Materials and Structural Integrity”, FMSI 2019). Співорганізаторами конференції виступили Європейське товариство з цілісності конструкцій (European Structural Integrity Society, ESIS), Українське товариство з механіки руйнування матеріалів, Фізико-механічний інститут імені Г.В. Карпенка НАН України та Національний університет “Львівська політехніка”.</p> <p><em>Матеріали прес-служби НАН України</em></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>
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.
Investigating fracture mechanisms in glassy polymers using coupled particle-continuum simulations
<p>This repository contains public data for the publication "Investigating fracture mechanisms in glassy polymers using coupled atomistic-continuum simulations" [1].</p> <p>These scripts, force fields, topologies and other files may be used to reproduce the simulations and calculations that led to the above publication.</p> <p>The folder "md simulations" contains data files for pure MD simulations that were used as a reference for understanding molecular fracture mechanisms in our model.</p> <p>The folder "coupled simulations" contains data files for coupled MD-FE simulations which are the highlight of our publication.</p> <p> </p> <p>Reference:</p> <p>[1] W. Zhao, Y. Jain, F. Müller-Plathe, P. Steinmann, S. Pfaller, "Investigating fracture mechanisms in glassy polymers using coupled particle-continuum simulations", Journal of the Mechanics and Physics of Solids, 2024, 105884. DOI: <a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.jmps.2024.105884" target="_blank" rel="noreferrer noopener"><span><span>https://doi.org/10.1016/j.jmps.2024.105884</span></span></a></p>
Monte Carlo Simulations results for estimating an offshore structure fatigue life with a Fracture Mechanics based crack growth model, after additional information was considered through Bayesian inference at t=13 years
<p>Monte Carlo Simulations results for estimating an offshore structure fatigue life with a Fracture Mechanics based crack growth model, after additional information was considered through Bayesian inference at t=13 years</p>
Pore-scale modeling and investigation on thermal-hydro-mechanical-chemical coupled rock dissolution and fracturing process
<p>Attached files include the executable file of the pore-scale multi-field coupled LBM-DEM program written by C language, post-processing programs to record the reactive surface area and reactive temperature written by MATLAB, and the simulation results of rock acid fracturing with 20MPa at the injection hole.</p>
Influences of reinforcement and displacement rate on microstructure, mechanical properties and fracture behaviors of cylinder-head aluminum alloy
<p>In the present work, the material microstructure, mechanical properties and fracture behaviors of cylinder-head aluminum alloys were experimentally investigated under different displacement rates and with and without the reinforcement. By the addition of nano-clay-particles and the heat treatment, it was tried to improve mechanical properties of the base material. For this objective, after the fabrication of as-cast and nano-composite samples, respectively by gravity and stir-casting; tensile testing was done on standard samples at the displacement rate of 0.1, 1 and 10 mm/min. Then, the sensitivity analysis was performed on experimental data to find quantitatively effects of two parameters of the reinforcement and the displacement rate. In addition, the optical microscopy and the field-emission scanning electron microscopy were utilized for the microstructure and the fracture surface, plus the energy dispersive X-ray analysis. Obtained results indicated that the microstructure of the aluminum alloy was finer due to the reinforcement. Besides, both the ultimate strength and the elongation enhanced. The regression analysis implied that the strength was sensitive only to the reinforcement. Although the elongation was sensitive to both the reinforcement and the displacement rate. Investigations of fracture surfaces showed brittle behaviors with cleavage and quasi-cleavage marks.</p>
Study on the mechanisms of Piezo1-lars2 signal path mediating the mechanical loading on endochondral ossification process of fracture healing
GEO Series GSE242712. Mus musculus. 6 samples. Type: Expression profiling by high throughput sequencing.
Mechanical Ventilation in Multiple Fracture Ribs
ClinicalTrials.gov study NCT03314701. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Assessment of Cortical Bone Mechanics Technology (CBMT) Fracture Discrimination Capability
ClinicalTrials.gov study NCT05721898. IPD Sharing: NO. Countries: 1. Publications: 0.
A Nonlinear Flow Model and Criterion for 3D Natural Fracture Intersections: Effects of Surface Roughness and Mechanical Aperture
<p>The present repository includes the raw data of flow rate ~ presure presented in the manuscript submitted for publication in Water Resources Research entitled <em>A Nonlinear Flow Model and Criterion for 3D Natural Fracture Intersections: Effects of Surface Roughness and Mechanical Aperture.</em></p> <p>The repository is presented as TXT files,and all other results including the linear and nonlinear coefficients in Forchheimer equation and permeability of fracture intersections can be calculated employing this basic data.</p> <p> </p>
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