2,632 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
Bad Astronomy
No full textThis web site is devoted to airing out myths and common misconceptions about astronomy and related topics. There is also a blog which the author, who is an astronomer, often posts to
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
An analysis of the correspondence and hagiographical works of Philip of Harvengt
No full textFor every famous author of the twelfth-century renaissance, there are numerous lesser-known writers. Despite being overshadowed by more brilliant scholars or those closer to the centre of important events, their voices add depth to the study of the intellectual history of this period. A founding member of one of the earliest Premonstratensian houses; a highly-educated and prolific author, much in demand as a hagiographer; and a vigorous defender of the clerical order, Philip of Harvengt is one such writer, and a worthy subject for study. This thesis examines two bodies of Philip’s works – his letters and his hagiographical writings – analysing the predominant and recurrent concerns and ideals expressed in them, and the means by which they are expressed.
The letters are carefully crafted works, examples of the literary labour which Philip writes is incumbent upon the cleric. The first part of this thesis approaches these letters in chapters on four themes: the role of the ecclesiastical prelate; the importance of learning; the relationship between religious orders; and Philip’s use of the motif of friendship. His hagiographical works, too, are examples of literary artistry, to move as well as to educate the audience. In the second part of the thesis, these will be discussed individually, with the first chapter analysing his vita of Oda, a nun attached to his own house, whom he portrays as a martyr. The succeeding chapters consider Philip’s rewritings of earlier vitae, and show how he managed his sources in order to produce vitae depicting their subjects according to his ideal model of sanctity.
Philip’s letters express concerns shared by contemporaries, reflecting anxieties surrounding roles and ideal forms of living in a period immediately following the first fervour of religious renewal. His hagiographies articulate ideals of sanctity, clarifying these when they are not made sufficiently explicit in earlier works, for the better edification of an audience pursuing this vita perfecta. Both letters and hagiographies are designed to exhort and instruct the reader or listener: above all, Philip is a teacher
On Philip Pullman’s fantastic politics and The Book of Dust
No full textFirst paragraph: Millions have been thrilled to hear that His Dark Materials author Philip Pullman is back with the long-awaited follow-up to the infamous trilogy. The Book of Dust had been referred to as early as the publication of The Amber Spyglass in 2000, but at last the first in a new trilogy is confirmed for publication in October. Pre-orders have already propelled the first title to the top of the bestseller lists, and speculation is running riot
Mapping residual and internal stress in materials by neutron diffraction
No full textNeutron 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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