Buckling of a spherical segment under the flat base load

Paper


Bauer, Svetlana and Ermakov, Andrei. 2013. "Buckling of a spherical segment under the flat base load." Lellep, J. and Puman, E. (ed.) 2nd International Conference on Optimization and Analysis of Structures (OAS 2013). Tartu, Estonia 25 - 27 Aug 2013 Tartu, Estonia.
Paper/Presentation Title

Buckling of a spherical segment under the flat base load

Presentation TypePaper
AuthorsBauer, Svetlana (Author) and Ermakov, Andrei (Author)
EditorsLellep, J. and Puman, E.
Journal or Proceedings TitleProceedings of the 2nd International Conference on Optimization and Analysis of Structures (OAS 2013)
Number of Pages4
Year2013
Place of PublicationTartu, Estonia
Web Address (URL) of Paperhttp://oas2015.ut.ee/OAS2013book.pdf
Conference/Event2nd International Conference on Optimization and Analysis of Structures (OAS 2013)
Event Details
2nd International Conference on Optimization and Analysis of Structures (OAS 2013)
Event Date
25 to end of 27 Aug 2013
Event Location
Tartu, Estonia
Abstract

The analysis of stress-strain states of soft and almost soft shells under internal pressure and flat base load are important in study of intraocular pressure, which is an important characteristic in ophthalmology. In the Maklakoff method of tonometry a human eye is deformed by flat base load. The diameter of the contact zone with cornea is measured and the measured diameter length is
used in estimating the intraocular pressure. When the intraocular pressure is not very high and the thickness of an eye shell (cornea) is small (for example, after refractive surgery) the cornea may
buckle and detach from tonometer. It leads to errors in estimates of intraocular pressure.
Shells deformations under the flat base load are large and therefore described by equations of geometrically nonlinear theory of shells. In our study the Paliy-Spiro theory of anisotropic shells of moderate thickness was applied. The problem was solved by means of the method of consequent loading (delta method). Since only linear physical relations are used in delta method one can trace
each step of solution of linear systems with constant coefficients. The results obtained with i) linearized non-linear equilibrium equations, ii) the method of minimization of shell elastic potential and iii) finite element method are compared.
The research leads us to the following conclusions: The flatter form of the shell makes larger the radius of the contact area between the cornea and the load and makes larger the radius of the inner unloaded area. Decreasing of the shell thickness also leads to increasing of the radius of the contact area, however, this parameter has affect less on the measurement of the intraocular pressure, than the parameter of flatness.

Keywordsintraocular pressure, deformation of shells, method of consequent loading.
ANZSRC Field of Research 2020490303. Numerical solution of differential and integral equations
420701. Biomechanics
401707. Solid mechanics
Public Notes

c. University of Tartu Press, 2013.

Byline AffiliationsSaint Petersburg State University, Russia
Institution of OriginUniversity of Southern Queensland
Permalink -

https://research.usq.edu.au/item/q3q38/buckling-of-a-spherical-segment-under-the-flat-base-load

  • 1675
    total views
  • 17
    total downloads
  • 0
    views this month
  • 0
    downloads this month

Export as

Related outputs

Development of rigorous methods in fluid mechanics and theory of water waves
Ermakov, Andrei. 2019. Development of rigorous methods in fluid mechanics and theory of water waves. PhD Thesis Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/ez1n-g463
Transformation of Long Surface and Tsunami-Like Waves in the Ocean with a Variable Bathymetry
Ermakov, Andrei and Stepanyants, Yury. 2020. "Transformation of Long Surface and Tsunami-Like Waves in the Ocean with a Variable Bathymetry." Pure and Applied Geophysics. 177 (3), pp. 1675-1693. https://doi.org/10.1007/s00024-019-02259-4
Soliton interaction with external forcing within the Korteweg–de Vries equation
Ermakov, Andrei and Stepanyants, Yury. 2019. "Soliton interaction with external forcing within the Korteweg–de Vries equation." Chaos: an interdisciplinary journal of nonlinear science. 29 (1). https://doi.org/10.1063/1.5063561
Local stability of a plate with a circular inclusion under tensile stress
Bauer, Svetlana, Ermakov, Andrei, Kashtanova, Stanislava and Morozov, Nikita. 2018. "Local stability of a plate with a circular inclusion under tensile stress." Pietraszkiewicz, Wojciech and Witkowski, Wojciech (ed.) Shell structures: theory and applications, vol. 4. London, United Kingdom. CRC Press. pp. 199-202
Wave scattering in spatially inhomogeneous currents
Churilov, Semyon, Ermakov, Andrei and Stepanyants, Yury. 2017. "Wave scattering in spatially inhomogeneous currents." Physical Review D. 96 (6), p. 064016. https://doi.org/10.1103/PhysRevD.96.064016
Scattering of long water waves in a canal with rapidly varying cross-section in the presence of a current
Churilov, Semyon, Ermakov, Andrei, Rousseaux, Germain and Stepanyants, Yury. 2017. "Scattering of long water waves in a canal with rapidly varying cross-section in the presence of a current." Physcial Review Fluids. 2 (9), p. 094805. https://doi.org/10.1103/PhysRevFluids.2.094805
Stress-strained state and the stability of a spherical segment under the influence of a load with a flat base
Ermakov, A. M.. 2013. "Stress-strained state and the stability of a spherical segment under the influence of a load with a flat base." Logg, Anders, Mardal, Kent-Andre and Massing, Andre (ed.) 26th Nordic Seminar on Computational Mechanics. Oslo, Norway 23 - 25 Oct 2013 Oslo, Norway.
On the stability of the cylindrical shell under the axial compression with use of non-classical theories of shells
Ermakov, A. M.. 2012. "On the stability of the cylindrical shell under the axial compression with use of non-classical theories of shells." Holzapfel, Gerhard (ed.) 8th European Solid Mechanics Conference (ESMC-2012) . Graz, Austria 09 - 13 Jul 2012 Graz, Austria.
Stress--strain state of the sclera and cornea as orthotropic non-uniform conjugated spherical shells
Ermakov, A. M.. 2008. "Stress--strain state of the sclera and cornea as orthotropic non-uniform conjugated spherical shells." Russian Journal of Biomechanics. 13 (1), pp. 47-58.
Tonometric estimation of mechanical properties of a cornea and sclera
Voronkova, E., Bauer, S. and Ermakov, A.. 2009. "Tonometric estimation of mechanical properties of a cornea and sclera." 2009 Association for Research in Vision and Ophthalmology Annual Meeting (ARVO 2009). Fort Lauderdale, United States of America 03 - 07 May 2009 United States. Association for Research in Vision and Ophthalmology (ARVO).
Biomechanical analysis of parameters influencing pressure-volume relationship in the human eye
Bauer, S. M., Ermakov, A. M., Kotliar, K. E. and Voronkova, E. B.. 2010. "Biomechanical analysis of parameters influencing pressure-volume relationship in the human eye." 2010 Association for Research in Vision and Ophthalmology Annual Meeting (ARVO 2010). Fort Lauderdale, United States of America 02 - 06 May 2010 Association for Research in Vision and Ophthalmology (ARVO).
The models of nonclassical anisotropic spherical shells
Ermakov, A.. 2012. "The models of nonclassical anisotropic spherical shells." Pecherski, Ryszard, Rojek, Jerzy and Kowalczyk, Piotr (ed.) 38th Solid Mechanics Conference. Warsaw, Poland 27 - 31 Aug 2012 Warsaw, Poland.
Description of vortical flows of incompressible fluid in terms of quasi-potential function
Ermakov, A. M. and Stepanyants, Y. A.. 2016. "Description of vortical flows of incompressible fluid in terms of quasi-potential function." 20th Australasian Fluid Mechanics Conference (AFMC 2016). Perth, Australia 05 - 08 Dec 2016 Australia.
Mathematical modelling of applanation tonometry for intraocular pressure measurements
Ermakov, Andrei M. and Bauer, Svetlana M.. 2016. "Mathematical modelling of applanation tonometry for intraocular pressure measurements." 55th ASMR National Scientific Conference: Next Generation Healthcare - Merging Biology and Technology . Gold Coast, Australia 13 - 15 Nov 2016
Application of nonclassical models of shell theory to study mechanical parameters of multilayer nanotubes
Bauer, S. M., Ermakov, A. M., Kashtanova, S. V. and Morozov, N. F.. 2011. "Application of nonclassical models of shell theory to study mechanical parameters of multilayer nanotubes." Vestnik: Mathematics (St. Petersburg University). 44 (1), p. Article 13. https://doi.org/10.3103/S1063454111010055
Evaluation of the mechanical parameters of nanotubes by means of nonclassical theories of shells
Bauer, Svetlana M., Ermakov, Andrei M., Kashtanova, Stanislava V. and Morozov, Nikita F.. 2011. "Evaluation of the mechanical parameters of nanotubes by means of nonclassical theories of shells." Altenbach, Holm and Eremeyev, Victor A. (ed.) Shell-like structures. Heidelberg, Germany. Springer. pp. 519-530
Nonclassical models in the shell theory with applications to multilayered nanotubes
Bauer, Svetlana M., Ermakov, Andrei M., Kashtanova, Stanislava V. and Morozov, Nikita F.. 2011. "Nonclassical models in the shell theory with applications to multilayered nanotubes." Papadrakakis, Manolis, Fragiadakis, Michalis and Plevris, Vagelis (ed.) 3rd ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2011). Corfu, Greece 25 - 28 May 2011 Dordrecht, Netherlands. https://doi.org/10.1007/978-94-007-6573-3
Numerical and analytical modeling of the stability of the cylindrical shell under the axial compression with the use of the non-classical theories of shells
Ermakov, Andrei M.. 2013. "Numerical and analytical modeling of the stability of the cylindrical shell under the axial compression with the use of the non-classical theories of shells." Lecture Notes in Computer Science (Book series). 8236, pp. 279-286. https://doi.org/10.1007/978-3-642-41515-9_30