3,328 research outputs found
Ultra-fast time-lapse synchrotron radiation CT imaging of compressive failure in unidirectional glass fibre-epoxy composite
No full textThis series of ultra-fast X-ray computed tomography datasets were acquired on the TOMCAT beamline at the Swiss Light Source by the composite group at Henry Moseley X-ray Imaging Facility (within the Henry Royce Institute @Manchester).
The experiment was designed to help understand the catastrophic failure of unidirectional fibre reinforced composites under compression, as part of Ying Wang's PhD project (Damage Mechanisms Associated with Kink-Band Formation in Unidirectional Fibre Composites) supervised by Prof. Philip J. Withers.
A notched unidirectional glass fibre-epoxy composite specimen was loaded in-situ under compression in a tension/compression rig developed at INSA-Lyon. An initial scan of the composite gauge section was acquired before loading (GFRP_Initial.zip). During the in-situ loading process, the composite specimen was imaged statically at 200 N (GFRP_Static_200N.zip) and 600 N (GFRP_Static_600N.zip), after which the acquisition mode was changed to continuous streaming in order to capture the final stages immediately leading up to failure, at 876 N (GFRP_Continuous_876N.zip), 893 N (GFRP_Continuous_893N.zip), 895 N (GFRP_Continuous_895N.zip), and right after collapse (at 79 N, GFRP_Failed.zip).
The CT acquisition speed attained 1 tomogram per second. The voxel size of the reconstructed CT data-sets is (1.1 μm)3.
For use of the data, please cite the DOI of the repository and the relevant papers -
http://doi.org/10.5281/zenodo.2597497
Wang, Y., Emerson, M. J., Conradsen, K., Dahl, A. B., Dahl, V. A., Maire, E. and Withers, P. J. (2021). Evolution of Fibre Deflection Leading to Kink-band Formation in Unidirectional Glass Fibre/Epoxy Composite Under Axial Compression. Composites Science and Technology. (Under Review)
Emerson, M. J., Wang, Y., Withers, P. J., Conradsen, K., Dahl, A. B., and Dahl, V. A. (2018). Quantifying fibre reorientation during axial compression of a composite through time-lapse X-ray imaging and individual fibre tracking. Composites Science and Technology, 168, 47-54.
Wang, Y., Garcea, S. C., Lowe, T., Maire, E., Soutis, C. and Withers, P. J. (2016). Ultra-fast time-lapse synchrotron radiographic imaging of compressive failure in CFRP. In ECCM16-16th European Conference on Composite Materials, Munich, Germany.
Garcea, S. C. , Wang, Y. and Withers, P. J. (2018). X-ray computed tomography of polymer composites, Composites
Science and Technology (156), 305-319.
Wang, Y., Garcea, S. C. and Withers, P. J. (2018). Computed Tomography of Composites in Comprehensive Composite
Materials II (7), 101-118. Eds. Beaumont PWR, Zweben CH. Elsevier.We acknowledge the Engineering and Physical Science Research Council (EPSRC) for funding the Henry Moseley X-ray Imaging Facility within the Henry Royce Institute through grants (EP/F007906/1, EP/F001452/1, EP/I02249X, EP/M010619/1, EP/F028431/1, and EP/M022498/1). PJW acknowledges support from the European Research Council grant No 695638 CORREL-CT
Obituary: Philip J. Davis
No full textWith deep sorrow, we announce the passing of Philip J. Davis on March 14, 2018, at the age of 95. Phil was one of the founding fathers of SIAM and a prolificcontributor to SIAM News; he was an innovative mathematician, an inspiring teacher, an entertaining and wide-ranging author, and a profound thinker on the nature and significance of mathematics
Ultra-fast time-lapse synchrotron radiation CT imaging of compressive failure in unidirectional glass fibre-epoxy composite
No full textThis series of ultra-fast X-ray computed tomography datasets were acquired on the TOMCAT beamline at the Swiss Light Source by the composite group at Henry Moseley X-ray Imaging Facility (within the Henry Royce Institute @Manchester). The experiment was designed to help understand the catastrophic failure of unidirectional fibre reinforced composites under compression, as part of Ying Wang's PhD project (Damage Mechanisms Associated with Kink-Band Formation in Unidirectional Fibre Composites) supervised by Prof. Philip J. Withers. A notched unidirectional glass fibre-epoxy composite specimen was loaded in-situ under compression in a tension/compression rig developed at INSA-Lyon. An initial scan of the composite gauge section was acquired before loading (GFRP_Initial.zip). During the in-situ loading process, the composite specimen was imaged statically at 200 N (GFRP_Static_200N.zip) and 600 N (GFRP_Static_600N.zip), after which the acquisition mode was changed to continuous streaming in order to capture the final stages immediately leading up to failure, at 876 N (GFRP_Continuous_876N.zip), 893 N (GFRP_Continuous_893N.zip), 895 N (GFRP_Continuous_895N.zip), and right after collapse (at 79 N, GFRP_Failed.zip). The CT acquisition speed attained 1 tomogram per second. The voxel size of the reconstructed CT data-sets is (1.1 μm)3. Update regarding the fibre trajectories on 20 August 2024: The extracted fibre trajectories dataset for Fig.4 in the published paper "Wang, Y., Emerson, M. J., Conradsen, K., Dahl, A. B., Dahl, V. A., Maire, E. and Withers, P. J. (2021). Evolution of Fibre Deflection Leading to Kink-band Formation in Unidirectional Glass Fibre/Epoxy Composite Under Axial Compression. Composites Science and Technology, 213, 108929. " has been added to this new version. Please note that the centre positions of 5229 fibres (the row number of x and y coordinates corresponds to the fibre number) on the 1264 xy CT slices (the column number of x and y coordinates corresponds to the slice number) were stored in this file. The x, y, and z (slice number) coordinates all need to be multiplied by the voxel size of 1.1 μm to get the physical positions of the fibre trajectories. For use of the data, please cite the DOI of the repository and the relevant papers - http://doi.org/10.5281/zenodo.13348028 Wang, Y., Emerson, M. J., Conradsen, K., Dahl, A. B., Dahl, V. A., Maire, E. and Withers, P. J. (2021). Evolution of Fibre Deflection Leading to Kink-band..
Depth capabilities of neutron and synchrotron diffraction strain measurement instruments: Part I - The maximum feasible path length
Full text linkIn this paper an algorithm is presented for estimating the maximum feasible penetration path length for neutron and synchrotron X-ray strain measurement instruments. This reflects the attenuation and scattering capability of the material under examination, the incident flux and detector arrangement, the likely background signal, the required strain measurement accuracy, the sampling volume and the diffracting geometry. Its validity and generality is examined through a consideration of data collected using a number of instruments on a variety of materials. Two criteria for the maximum feasible path length are examined: one based on the maximum acquisition time, the other based on the minimum acceptable peak height to background ratio. As demonstrated in the companion paper [part II: Withers (2004). J. Appl. Cryst. 37, 607-612], the algorithm can be used to delineate those conditions under which neutron and synchrotron X-ray radiations can provide useful information and to identify which is most suited to any particular measurement task
Can ChatGPT Be Considered an Author of a Medical Article?
Full text linkKazuki Ide, Philip Hawke, Takeo Nakayama, Can ChatGPT Be Considered an Author of a Medical Article?, Journal of Epidemiology, 2023, Volume 33, Issue 7, Pages 381-382, Released on J-STAGE July 05, 2023, Advance online publication April 08, 2023, Online ISSN 1349-9092, Print ISSN 0917-5040, https://doi.org/10.2188/jea.JE20230030, https://www.jstage.jst.go.jp/article/jea/33/7/33_JE20230030/_article/-char/e
Motion and mobility in the realist novels of Philip K Dick
No full textThis essay explores the ways that ideas of motion and mobility support readings of Philip K Dick's early novels that take full account of the changing geographical context. They are set during a period of rapid suburban expansion, the building of the interstate and the spread of automobility through car ownership, and their characters frequently exist in a state between continuity through conformity and the potential for change. The open ended forms of the novels reflect a world around Dick that was still under construction, and where alternative realities can be glimpsed between incomplete materialities
Code to reproduce results of "Core Imaging Library Part I: a versatile python framework for tomographic imaging"
No full textThis code reproduces all the results presented in the article
Core Imaging Library Part I: a versatile python framework for tomographic imaging
by Jakob S. Jørgensen, Evelina Ametova, Genoveva Burca, Gemma Fardell, Evangelos Papoutsellis, Edoardo Pasca, Kris Thielemans, Martin Turner, Ryan Warr, William R. B. Lionheart, and Philip J. Withers
which will be available from 5 July 2021 at
https://doi.org/10.1098/rsta.2020.0192
A preprint is available from arXiv:
https://arxiv.org/abs/2102.04560
Instructions are available in the file README.md as well as at the source GitHub repository
https://github.com/TomographicImaging/Paper-2021-RSTA-CIL-Part-
Mapping residual and internal stress in materials by neutron diffraction
Full text linkNeutron diffraction provides one of the few means of mapping residual stresses deep within the bulk of materials and components. This article reviews the basic scientific methodology by which internal strains and stresses are inferred from recorded diffraction peaks. Both conventional angular scans and time-of-flight measurements are reviewed and compared. Their complementarity with analogous synchrotron X-ray methods is also highlighted. For measurements to be exploited in structural integrity calculations underpinning the safe operation of engineering components, measurement standards have been defined and the major findings are summarised. Examples are used to highlight the unique capabilities of the method showing how it can provide insights ranging from the basic physics of slip mechanisms in hexagonal polycrystalline materials, through the materials optimisation of stress induced transformations in smart nanomaterials, to the industrial introduction of novel friction welding processes exploiting stress residual measurements transferred from prototype sub-scale tests to the joining of full-scale aeroengine assemblies. To cite this article: P.J. Withers, C. R. Physique 8 (2007). © 2007 Académie des sciences
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