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66 results for “toughness”
Fracture Toughness of Off-Stoichiometric B2 NiAl as determined by micromechanical tests and atomistic simulations
<p>KQJ-Alconcentration-NiAl_experiment.csv : semicolon-separated ASCII file containing the fracture toughness (2nd column) and the contribution of the plastic deformation to the fracture toughness (3rd column) as function of Al concentration (1st column) for off-stoichiometric B2 NiAl as determined by micro mechanical tests on notched cantilever beams.</p> <p>KIc-Alconcentration-NiAl_static-simulations.dat : space-separated ASCII file containing the fracture toughness (K_Ic) of B2 NiAl (2nd column) for different Al concentrations (first column) as as determined by static atomistic calculations with the<br> # Potential by G. P. P. Pun, Y. Mishin, (Phil. Mag. 89 (34-36) (2009) 3245– 3267).</p> <p>NiAl_Pun_conc_0.40-0.65Ni_Esurf110_Cij.dat : space-separated ASCII file containing the energy of {110} surfaces (2nd column) and elastic constants (columns 3-5) of B2 NiAl for different Ni concentrations (f1st column) as determined by atomistic simulations using the the potential by G. P. P. Pun, Y. Mishin, (Phil. Mag. 89 (34-36) (2009) 3245– 3267)</p> <p>KIc-Alconcentration-NiAl_theory.dat : space-separated ASCII file containing the fracture toughness (K_Ic) of B2 NiAl (2nd column) for different Al concentrations (1st column) as calculated by the Griffith equation.</p> <p> </p>
Experimental data for fracture toughness analysis of sandstone and granite samples under fluid saturation conditions
<p>This database includes experimental results from mode I fracture toughness (KIC) tests conducted on saturated rock specimens. Three lithologies were studied: a porous siliceous sandstone (Corvio, C) and two high-strength, low-porosity granites (Blanco Mera, BM and Blanco Alba, BA). Tests were conducted at room pressure and temperature using the pseudo-compact tension (pCT) methodology. Seven different fluids were used: deionized water, methanol, NaCl-saturated water, mineral oil, diesel fuel, an acidic HCl solution, and a caustic NaOH solution.</p>
Interlocked thin-ply reinforcements for improved fracture toughness and compression after impact - 0 degree tabs
<p>This dataset contains data showing the effect of thin-ply reinforcement units, interlocked with a tab-and-slit geometry, on the fracture toughness of CFRP laminates. This dataset forms an addition to the dataset previously published here: https://doi.org/10.5281/zenodo.1476886. The previous dataset contains toughness data for reinforcements with tabs at 45 degrees. This dataset contains toughness data for reinforcements with tabs at 0 degrees.</p> <p>The reinforcement concept was first presented at the 18th European Conference on Composite Materials (2018, Athens, Greece). More information on the concept can be found at: http://wwwf.imperial.ac.uk/aeronautics/research/pinholab/interlock-tabs/. Links to publications connected to this data will be added to the Zenoto meta-data as they are published.</p> <p>For the reinforcement concept, both mode I and mode II fracture toughnesses were measured. The mode I data was acquired using DCB specimens, and the mode II data was obtained from 4-point end notch flexure (4ENF) tests. Force, displacement, crack length, and strain energy release rate during the test are provided for all specimens.</p>
Dataset for "Complexity of crack front geometry enhances toughness of brittle solids"
<div>This data package supports the publication</div> <div>'Complexity of crack front geometry enhances toughness of brittle solids'</div> <div>by Xinyue Wei, Chenzhuo Li, Cían McCarthy, and John M. Kolinski</div> <div>Nature physics (2024) - <span><a href="https://doi.org/10.1038/s41567-024-02435-x">https://doi.org/10.1038/s41567-024-02435-x</a></span></div> <div> </div> <div>DOI: 10.5281/zenodo.10604552</div> <div> </div> <div> </div> <div>The data package includes </div> <div>- data for material characterization in 'material_test.xlsx';</div> <div>- segmented 3D crack data in "segmented_3D_crack_stacks" folder.</div> <div> </div> <div> </div> <div>'material_test.xlsx' includes</div> <div>- shear modulus for Gel1, Gel2, Gel3, Gel4, and PDMS;</div> <div>- stretch v.s. engineering stress for the five materials.</div> <div> </div> <div> </div> <div>'segmented_3D_crack_stacks' includes</div> <div>- 'sample_info.xlsx': metadata for all the cracks including the critically loaded cracks and the cracks with local </div> <div> propagation in two sheets, with the following information:</div> <div>- 'crack_name' corresponds to the title of each tif file in the subfolders;</div> <div>- 'sample' indicates the material and thickness of the samples;</div> <div>- 'xy_scale_um' and 'z_scale_um' are the resolutions in microns in xyz direction ;</div> <div>- 's_start' and 's_end' provide the range of the valid slices, with s_end excluded. The first slice is s=0;</div> <div>- 'tile_s_start' and 'tile_s_end' provide the range of the valid slices of the tile scans. The tile scans </div> <div> are taken for the measurement of strain energy release rate from the far field CTOD. Since the field of </div> <div> view is large enough to cover the K-dominant region of Gel1, tile scan is not taken for Gel1;</div> <div>- 'remarks' are the comments for the data points (if applicable).</div> <div> </div> <div>- 'critically_loaded_cracks': tif stacks for the binarized 3D cracks that are loaded to critical state. </div> <div> Different materials and sample thicknesses are in separate folders. </div> <div>- 'local_propagation': tif stacks for the binarized 3D cracks before critically loaded. </div> <div> </div> <div> </div>
Fig. 3 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 3. Photographs of the outgroup (Lacomucinaea) and representatives of the major clades of Thesium. The numbers in the upper right corners correspond to clade numbers on the Bayesian tree (Fig. 2A). Details of flower and/or fruits are shown in the insets. A, Lacomucinaea clade, L. lineata; B, Kunkeliella clade, T. subsucculentum; C, Thesidium clade, T. fragile; D, Mauritanica clade, T. mauritanicum; E, Humilia clade, T. humile; F, Macranthia clade, T. szowitsii; G, Eurasian clade, T. minkwitzianum; H, Procumbens clade, T. brachyphyllum; I, Parnassi clade, T. parnassi; J, Bavarum clade, T. bavarum; K, Alpina clade, T. alpinum; L, Linophylla clade, T. humifusum; M, Second Asian Radiation, T. catalaunicum; N, Rostratum clade, T. rostratum; O, Multicaule clade, T. ebracteatum; P, Australe clade, T. chinense; Q, Longifolia clade, T. refractum; R, Ramosum clade, T. ramosum; S, Himalensia clade, T. himalense; T, Alatavicum clade, T. alatavicum. — For photo credits, see suppl. Appendix S3.
Fig. 5 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 5. Photographs of representatives of the major clades of Thesium species. The numbers in the upper right corners correspond to clade numbers on the Bayesian tree (Fig. 2C,D). L.S. = longitudinal section. A, Ussanguense clade, T. passerinoides, herbarium specimen (Christiaensen 2495, BR) with rehydrated flowers and fruits; B, Stuhlmannii clade, T. fimbriatum, herbarium specimen (Goldblatt 8056, MO) with rehydrated flowers and fruits; C, Austroamericium clade, T. aphyllum, habit and flowers; D, Tenuissimum clade, T. tenuissimum, herbarium specimen (Meijer 15407, BR) with rehydrated flowers; E, Reekmansii clade, T. madagascariense, herbarium specimen (Evrard 11284, BR) with rehydrated flower; F, Reekmansii clade, T. wilczekianum Lawalrée, herbarium specimen (Milne-Redhead 3581, BR), dissected flower from rehydrated herbarium specimen (Malaisse 8407, BR). Asterisk denotes calyx lobe; G, Filipes clade, T. filipes, flowering shoot, flowers, fruit. Asterisks denote calyx lobes; H, Amicorum clade, T. amicorum, herbarium specimen and rehydrated flowers (Lisowski & al. 5736, BR); I, Viride clade, T. equisetoides, flower shoots and flower developmental series; J, Viride clade, T. fastigiatum, habit and flowers; K, Angulosum clade, T. angulosum, shoot with floral buds, flowers, fruit L.S.; L, Cupressoides clade, T. cupressoides, habit, flowers, young fruits; M, LDD2 clade, T. radicans, habit, fruits; N, LDD2 clade, T. psilotoides, herbarium specimen and rehydrated flowers and fruits (Williams 1310, NY); O, LDD2 clade, T. decaryanum, flowering shoot and closer view of flowers; P, Pallidum clade, T. pallidum, flowering shoots, flowers, fruit; Q, Cornigerum clade, T. cornigerum, shoot with flowers and young fruits, close-up of same; R, Kilimandscharicum clade, T. dolichomeras, habit, flowers, fruits; S, Resedoides clade, T. resedoides, habit, flower, young fruits; T, Gracile clade, T. gracile, habit, flowers, fruit. — For photo credits, see suppl. Appendix S3.
Fig. 4 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 4. Photographs of representatives of the major clades of mostly South African Thesium species. The numbers in the upper right corners correspond to clade numbers on the Bayesian tree (Fig. 2B,C). L.S = longitudinal section. A, African clade, T. nautimontanum, rehydrated herbarium specimens showing flower and young fruits (ˇSibík & ˇSibíková MS463, MA); B, Spinosum clade, T. spinulosum, shoot with flowers and fruits, flower and L.S., fruit L.S.; C, Namaquense clade, T. lacinulatum, habit, flower and fruits; D, Triflorum clade, T. scandens, flowering shoots, flowers, and fruit L.S.; E, Triflorum clade, T. triflorum; F, Core Cape clade, T. euphorbioides, flowering shoots, flowers, and fruit L.S.; G, Foliosum clade, T. foliosum, flowering shoots, flower L.S., and fruit L.S.; H, Ericaefolium clade, T. ericaefolium, flowering shoots, flowers, and fruits; I, Scirpioides clade, T. flexuosum, flowering shoots, flower L.S., and fruit L.S.; J, Strictum clade, T. albomontanum, habit, flower L.S., and fruits; K, Capitatum clade, T. carinatum, shoots with young fruits, flower L.S., and fruit L.S.; L, Annulata clade, T. funale, shoots with flowers and young fruits, flower L.S., and fruit L.S; M, Nigromontanum clade, T. nigromontanum, shoots with flowers and young fruits, flower L.S., and fruit L.S.; N, Virgatum clade, T. pseudovirgatum, habit, flower L.S., and fruit L.S.; O, Capitellatum clade, T. prostratum, flowering shoots, flower L.S., and fruit L.S.; P, Acuminatum clade, T. capituliflorum, flowering shoots, flower L.S., and fruit L.S.; Q, Hispidulum clade, T. hispidulum, flowering shoots, flower L.S., and fruit L.S.; R, Commutatum clade, T. commutatum, shoots with flowers and young fruits, flower L.S., and fruit L.S.; S, Gnidiaceum clade, T. gnidiaceum (left); T. impeditum (right), inflorescences; T, Gnidiaceum clade, T. oresigenum (left) showing pendant habit and flowers; T. phyllostachyum (right) inflorescence and flower close-up. — For photo credits, see suppl. Appendix S3.
Figure 2 in Middle Miocene origins for tough-browse dietary specialisations in the koala (Marsupialia, Phascolarctidae) evolutionary tree: description of a new genus and species from the Riversleigh World Heritage Area
Figure 2. Stelakoala riversleighensis gen. et sp. nov. holotype (QM F57737) from Jim's Jaw Site, Riversleigh World Heritage Area, Qld. A-A', Occlusal stereopair; B, labelled occlusal view; C, lingual view; D, buccal view. Abbreviations: co, cristid obliqua; end, entoconid; esd, entostylid; er, entostylid ridge; hyd, hypoconid; lr, lingual ribs; med, metaconid; msd, metastylid; pad, paraconid; ppsd, preprotostylid cristid; prd, protoconid; psd, protostylid.
Figure 1 in Middle Miocene origins for tough-browse dietary specialisations in the koala (Marsupialia, Phascolarctidae) evolutionary tree: description of a new genus and species from the Riversleigh World Heritage Area
Figure 1. Map and regional schematic of the Riversleigh World Heritage Area (After Arena, 2005, and Megirian, 1992). The Type locality of Stelakoala riversleighensis gen. et sp. nov., Jim's Jaw Site, is located on the northern Gag Plateau (highlighted red).
Figure 3 in Middle Miocene origins for tough-browse dietary specialisations in the koala (Marsupialia, Phascolarctidae) evolutionary tree: description of a new genus and species from the Riversleigh World Heritage Area
Figure 3. The evolution of primary M1 trigonid cuspids (metaconid, protoconid and protostylid) in phascolarctids. A, Schematic diagram of a phascolarctid right M 1 illustrating how dimensions and percentages represented in Table 1 were obtained (adapted from Black et al., 2014a); B, Graphical representation of the relative positions and distance between the primary M 1 trigonid cuspids as a percentage of trigonid width; C, phylogenetic relationships of phascolarctids (from Black et al., 2012a). Abbreviations: end, entoconid; hyd, hypoconid; med, metaconid, prd, protoconid; psd, protostylid. Data for Madakoala, Perikoala, Litokoala, Nimiokoala and Phascolarctos, is based on M. devisi, Pe. robustus, L. kutjamarpensis, N. greystanesi and P. cinereus, respectively, with mean values used for the latter two species (Table 1).
Interlocked thin-ply reinforcements for improved fracture toughness and compression after impact
<p>This dataset contains data showing the effect of interlocked thin-ply reinforcement units on the fracture toughness and compression after impact strength of CFRP laminates. For both the fracture toughness and the CAI experiments, tests were conducted on non-reinforced baseline specimens, as well as reinforced specimens. These experiments were conducted to test a reinforcement concept, consisting of creating reinforcement units by interlocking two thin-ply prepreg layers with a tab-and-slit geometry. These reinforcement units are then inserted between the plies of a regular composite lay-up.</p> <p>This reinforcement concept was first presented at the 18th European Conference on Composite Materials (2018, Athens, Greece). More information on the concept can be found at: http://wwwf.imperial.ac.uk/aeronautics/research/pinholab/interlock-tabs/. </p> <p>The fracture toughness section of this dataset contains both mode I and mode II data. The mode I data was acquired using DCB specimens, and the mode II data was obtained from 4-point end notch flexure tests. Force, displacement, crack length, and strain energy release rate during the test are provided for all specimens.</p> <p>The CAI section of the dataset contains post-impact C-scans, as well as force, displacement, and strain gauge data from the subsequent compression tests.</p> <p><br> </p>
Research data supporting "The fracture toughness of demi-regular lattices"
<p>Research data supporting "The fracture toughness of demi-regular lattices" published in <em>Scripta Materialia</em> in 2023. This dataset includes:</p> <ul> <li>Processed data plotted in Figures 2 and 4 (Figs.xlsx).</li> <li>Python scripts used to generate the finite element models (*.py files). These have to be used with the commercial software Abaqus CAE.</li> </ul>
Research data supporting "Fracture toughness of semi-regular lattices"
<p>Research data supporting "Fracture toughness of semi-regular lattices" published in <em>International Journal of Solids and Structures</em> in 2023. This dataset includes:</p> <ul> <li>Processed data plotted in Figures 4, 5, 6, 10, and A2 (*.xlsx files).</li> <li>Raw data plotted in Figure 8 (Fig 8.xlsx).</li> <li>CAD files for all test specimens (*.STL files).</li> <li>Python scripts used to generate the finite element models (*.py files). These have to be used with the commercial software Abaqus CAE.</li> </ul>
Raw data for Role of molecular damage in crack initiation mechanisms of tough elastomers, PNAS 2024 Vol. 121 e2410515121
<p>This the raw data for figures 1-5 of the paper. the images and the data sets in csv format</p>
Fig. 2 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 2. Phylogenetic analysis of Thesium using nuclear ribosomal internal transcribed spacer (ITS) sequences. This tree, rooted with Osyridicarpos and Lacomucinaea (outgroups) gives Bayesian posterior probabilities at the nodes. Clades discussed in the text are numbered. Geographical sources for the sampled taxa are abbreviated as follows: AFN = Northern Africa, AFS = Southern Africa, AFT = Tropical Africa, ASC = Central Asia, ASE = Eastern Asia, ASN = Northern Asia, ASS = Southern Asia, ASW = Western Asia, AUS = Australia, CIS = Canary Islands, EUR = Europe, MAD = Madagascar, SAM = South America, and USA = United States of America.
Fig. 1 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 1. Map showing the distribution of Thesium worldwide. Data from GBIF were vetted and used for generating the first iteration. Additional information was obtained from specimen records given in various Floras.
Fig. 6 in A tough nutlet to crack: Resolving the phylogeny of Thesium (Thesiaceae), the largest genus in Santalales
Fig. 6. Photographs of representatives of the major clades of Thesium species. The numbers in the upper right corners correspond to clade numbers on the Bayesian tree (Fig. 2D). L.S = longitudinal section. A, Alatum clade, T. alatum, flowering shoots, stem details, fruits (Goetghebeur 4512, BR); B, Alatum clade, T. utile, habit, flowers, fruit L.S.; C, Davidsoniae clade, T. davidsoniae, habit, flower, fruits; D, Multiramulosum clade, T. multiramulosum, shoots with flowers and fruits; E, Virens clade, T. subsimile, habit, inflorescence, rehydrated and dissected flowers (Balkwill & Balkwill 11245, MO); F, Nigrum clade, T. magalismontanum, habit, flower, fruit L.S.; G, Lobelioides clade, T. lobelioides, herbarium specimen and rehydrated and dissected flowers (Brenan 14920, UPS); H, Goetzeanum clade, T. goetzeanum habit, flower L.S., inflorescence; I, Gracilarioides clade, T. gracilarioides, flowering shoots, flower, young fruits; J, Gracilarioides clade, T. polygaloides, herbarium specimen and rehydrated and dissected flowers (Hobson 442, MO); K, Costatum clade, T. asterias, flowering shoots, flower, flower L.S., and young fruits; L, Costatum clade, T. costatum, excavated plant, flower, fruit. — For photo credits, see suppl. Appendix S3.
Novel developments in clamped geometries for fracture toughness testing
<p>Stable fracture toughness test geometries are useful in not only determining the monotonic fracture toughness, but also in capturing the R-curve behaviour and damage tolerance of materials under cyclic loading and extreme environments. The doubly clamped boundary condition offers such crack stability even in the most brittle materials. This talk will cover all aspects of clamped beams and wires in tension and bending as fracture toughness test geometries including their geometric factor solutions for linear elastic and elastic-plastic cases. Finite element simulations are used to explain the mechanics of crack stability for various beam and wire aspect ratios and crack configurations. Their varied applications in bulk materials, architectured systems, thin film multilayers and graded coatings will be shown.</p> <p><strong>Related publications</strong></p> <ol> <li>A. K. Mishra, A. Lambai and V. Jayaram, B. Nagamani Jaya, “The edge-notched clamped beam bend specimen as a fracture toughness test geometry”, Theoretical and Applied Fracture Mechanics, 105, 2020, 102409 (DOI: 10.1016/j.tafmec.2019.102409)</li> <li>B. Nagamani Jaya, Sanjit Bhowmick, S. A. Syed Asif, Oden L. Warren and Vikram Jayaram, “Optimization of clamped beam geometry for fracture toughness testing of micron-scale samples” Phil Mag Special Issue on Nanomech IV, Vol 95, 2015, 1945-1966 (DOI: 10.1080/14786435.2015.1010623)</li> <li>B. Nagamani Jaya and Vikram Jayaram, “Crack stability in edge notched clamped beam specimen under bending: modeling and experiments”, International Journal of Fracture, Vol 188, Issue 2, 2014, 213-228 (DOI: 10.1007/s10704-014-9956-2)</li> <li>B. Nagamani Jaya, Vikram Jayaram and Sanjay K. Biswas, “A new method for fracture toughness determination of graded (Pt,Ni)Al bond coats by microbeam bend tests”, Philosophical Magazine Special Issue on Nanomechanical Testing in Materials Research and Development III, Vol 92, Issue 25-27, 2012, 3326-3345. (DOI: 10.1080/14786435.2012.669068)</li> </ol>
Water weakening and the compressive brittle strength of carbonates: influence of fracture toughness and static friction
<p>This is the ReadMe file corresponding to the study entitled:<br>"Water weakening and the compressive brittle strength of carbonates: influence of fracture toughness and static friction"<br>By Noël C., Fryer B., Baud P. and Violay M.</p> <p>This Read-Me file has been last edited in January 2024</p> <p>This readme file describes the data repository files accompanying the above publication published in IJRMMS. <br>For any further queries please contact corentin.noel@geoazur.unice.fr</p> <p>For each type of experiments (uniaxial compression, fracture toughness and friction), a zip file contains the the file of the experiments. Each file name contain the information of the sample tested and the experimental condition (dry or saturated):<br>- The first leter(s) stands for the limestone tested: In=Indiana, L=Leitha, S=Solnhofen, St=Saint Maximin, T=Tavel.<br>- The number following is for sample referencing.<br>- The next letter is for the experiment performed: U=Uniaxial compression, K=Fracture toughness, F=Friction<br>- After a "_", the experimental conditions are described: dry=dray experiments, sat=water saturated experiments</p> <p><br>*** Uniaxial compression ***<br>Each .txt file contains:<br>- Column 1: Axial stress (MPa)<br>- Column 2: Axial strain (-)<br>- Column 3: Radial strain (-)<br>- Column 4: Volumetric strain (-)</p> <p>Additionally, each experiments also have an accoustic file (.txt ending with _AE) containing:<br>- Column 1: Axial strain (-)<br>- Column 2: Cumulative AE number</p> <p>*** Fracture toughness ***<br>Each .txt file contains:<br>- Column 1: Axial displacement (mm)<br>- Column 2: Mode I stress intensity factor KI (MPa.m(1/2))<br>- Column 3: Crack mouth openning (mm)</p> <p>*** Friction ***<br>Each .txt file contains:<br>- Column 1: Time (s)<br>- Column 2: Shear stress (MPa)<br>- Column 3: Normal stress (MPa)<br>- Column 4: Shear displacement (mm)</p> <p>Additionally, for each experiment and both under dry and water saturated conditions a .xlsx file contains the picked static shear stress at the onset of sliding for each tested normal stress as follow:<br>- Column A: Normal stress (MPa)<br>- Column B: Shear stress at onset of sliding (MPa)<br>- Column C: Shear stress at onset of sliding lower boundary (MPa)<br>- Column D: Shear stress at onset of sliding higher boundary (MPa)<br>- Column E: Uncertainty on the shear stress at onset of sliding (MPa)</p>
Validation of the Arabic version of the mental toughness questionnaire
<p>The objective of this study was to assess the construct validity of the Arabic version of mental toughness MT based on the theoretical conception of the MTQ48 questionnaire <a href="#_ENREF_7">Clough et al. (2002)</a>. The 48 items consist of six components 6C :(1)Challenge CH, (2) Commitment CO, (3)Emotion Control EC, (4)Life Control LC, (5)Confidence in abilities CA,(6)Interpersonal confidence IC ,and the global score MT. The sample consisted of 853 Tunisian participants (444 males and 409 females; 409 athletes and 444 non-athletes), aged 14-27 years (<em>M=20.38 SD=4.12</em>). Cronbach's alpha suggests that over 48 items has adequate internal consistency (<em>α=.72)</em>. The EFA revealed a good sampling quality (df = 1128; p < .001). The CFA approved a good model fit (<em>χ²=1146.33; df =1065; CFI=.93; SRMR=.063; RMSEA=.009</em>). In conclusion, our results allowed us to propose a valid Arabic measure of the 6C of MT. The results confirm the factorial validity of the MTQ48 and indicate that the Arabic version of the questionnaire has a robust measure of the psychometric properties of mental toughness. Finally, stakeholders in the Arab region should be able to benefit from the MTQ48 questionnaire, such as and reliable measurement and assessment instruments.</p>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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