{"id":489,"date":"2012-06-02T00:17:20","date_gmt":"2012-06-01T20:17:20","guid":{"rendered":"http:\/\/nanobuild.ru\/en_EN\/?p=489"},"modified":"2014-06-02T00:18:54","modified_gmt":"2014-06-01T20:18:54","slug":"nanobuild-6-2013-pages-31-43","status":"publish","type":"post","link":"https:\/\/nanobuild.ru\/en_EN\/nanobuild-6-2013-pages-31-43\/","title":{"rendered":"nanobuild-6-2013-pages-31-43"},"content":{"rendered":"

Pages:\u00a0\u00a0 31 \u2013 43<\/strong><\/p>\n

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KINETICS OF DESTRUCTION OF NANOMODIFIED SULFIR COMPOSITES<\/strong><\/p>\n

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Authors<\/strong>:\u00a0 KOROLEV Evgenij Valerjevich, Doctor of Engineering, Professor, Director of the Research and Educational Center \u00abNanotechnology\u00bb, Penza State University of Architecture and Construction, Russian Federation;<\/p>\n

Yaroslavskoye hw. 26, 129337, Moscow, Russian Federation, korolev@nocnt.ru<\/p>\n

SMIRNOV Vladimir Alexeevich, Ph.D. in Engineering, Associate Professor, Leading Research Officer of the Research and Educational Center \u00abNanotechnology\u00bb, Penza State University of Architecture and Construction, Russian Federation; Yaroslavskoye hw. 26, 129337, Moscow, Russian Federation, smirnov@nocnt.ru<\/p>\n

KISELEV Denis Georgievich, postgraduate, Penza State University of Architecture and Construction, Russian Federation; Germana Titova street, 28, 440028, Penza, Russian Federation, info@nocnt.ru<\/p>\n

Extended Abstract:<\/strong>\u00a0 As the service load on structures is constantly growing, modern construction industry needs new materials which could provide more capabilities and meet special requirements for operational performance. One of such materials is the so-called sulfur<\/p>\n

composite. When producing this composite the sulfur is used as a binder and different powders, fibers and grains can be used as the disperse phases. There are many advantages of sulfur composites: cheap binder, quick structure forming, high chemical resistance etc. For some operational conditions, however, the sulfur composites show the lack of required compressive strength. But recently developed method \u2013 nanomodification \u2013 addresses mentioned drawback of sulfur composites. Nanomodification is the formation of intermediate nanoscale layer on fine filler by means of addition of selected precursor.<\/p>\n

Moreover, taking into account the necessity to characterize the material not only by one scalar parameter \u2013 the compressive strength \u2013 but also by kinetics of fracture, we candecide that experimental methods of fracture mechanics should be used during examination of sulfur composite. One of the most promising is the acoustic emission (AE) method, which is often designated as a method of non-destructive testing. Nevertheless, acoustic emission occurs \u2013 and can be measured \u2013 during the process of destructive testing too.<\/p>\n

The successful application of the acoustic emission method for studying kinetics of fracture imposes some requirements to testing machine characteristics; thus, all measurements were carried out with the device that had been developed for this purpose. It was shown that nanomodified sulfur composites demonstrate the reduction of AE energy to the final stage of load. Because of this, we propose to describe the fracture kinetics by \u00abmedian stress\u00bb \u2013 stress corresponding to the half-release of all AE energy during fracture. It was shown that offered scalar parameter is in strong correlation with compressive strength.<\/p>\n

Key words:<\/strong>sulfur composite, nanomodification, kinetics of destruction, acoustic emission.<\/p>\n

References: <\/em><\/strong><\/p>\n

1. Korolev E.V., Smirnov V.A., Albakasov A.I. <\/em>Nanomodified composites with thermoplastic<\/p>\n

matrix. Nanotechnologies in Construction: A Scientific Internet-Journal, Moscow, CNT \u00abNanostroitelstvo\u00bb. 2012, Vol. 4, no. 5. pp. 81\u201387. http:\/\/www.nanobuild.ru\/magazine\/nb\/Nanobuild_5_2012.pdf (accessed 31 Oct 2013). (In Russian).<\/p>\n

2. Smirnov V.A., Korolev E.V. <\/em>Nanomodified epoxy composites. Nanotechnologies in Construction: A Scientific Internet-Journal, Moscow, CNT \u00abNanostroitelstvo\u00bb. 2012, Vol. 4, no. 4. pp. 61\u201369. http:\/\/www.nanobuild.ru\/magazine\/nb\/Nanobuild_4_2012.pdf (accessed 31 Oct 2013). (In Russian).<\/p>\n

3. ASTM Standard E1316-13c, \u00abStandard Terminology for Nondestructive Examinations\u00bb, ASTM International, West Conshohocken, PA, 2013 DOI: 10.1520\/E1316<\/p>\n

4. Huang M., Jiang L., Liaw P., Brooks C., Seeley R., Klarstrom D. <\/em>Using Acoustic Emission in Fatigue and Fracture Materials Research. Journal of Minerals, Metals & Materials Society, 1998, vol. 50, no. 11. Available at: http:\/\/www.tms.org\/pubs\/journals\/JOM\/9811\/Huang\/Huang-9811.html (accessed 31 Oct 2013).<\/p>\n

5. Smirnov V.A., Korolev E.V. <\/em>Ustroystvo dlya akustiko-emissionnogo kontrolya kompozitsionnykh materialov [Equipment for Acoustic Emission Testing of Composites].<\/p>\n

Patent RF no. 2472145, 2013.<\/p>\n

6. Gorman M.R. <\/em>Modal AE Analysis of Fracture and Failure in Composite Materials, and the Quality and Life of High Pressure Composite Pressure Vessels. Journal ofAcoustic Emission, 2011, Vol. 29, pp. 1\u201328.<\/p>\n

7. Ono K. <\/em>Acoustic Emission in Materials Research \u2013 A Review. Journal of Acoustic Emission, 2011, Vol. 29, pp. 284\u2013308.<\/p>\n

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Full text in PDF format (31-43)<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"