Lateral impact of tubular structure – theoretical and experimental analysis. Part 1 – Investigation of single tube

• Autorzy: Lipa S. , Kotełko M.
• Języki publikacji: EN

Abstrakty

EN

If a thin-walled member is subjected to dynamic load, the estimation of its structural behaviour has to count for the strain-rate influence upon stress-strain material characteristics. It is particularly important when a thin-walled member works as an energy absorber. In the paper, the problem of collapse load, post-failure behaviour and energy dissipation of a tubular structure subjected to lateral impact load is presented. The analytical solution of the problem of initial collapse load and post-failure behaviour of a single tube is discussed. The analysis is limited to the “dynamic progressive crushing”, which means that we take into account the strain-rate but neglect inertia effects. The solution is based on the yield-line analysis and takes into account the impact velocity and strain rate, using the Cowper-Symonds constitutive relation. The same problem concerning both the single tube and multi-member tubular structure subjected to lateral bending impact load is solved using Finite Element (FE) simulation, which also takes into account the impact velocity and strain rate, using the corresponding to Cowper-Symonds Perzyna material model. Results of numerical calculations are compared with those obtained from the quasi-dynamic tests performed at different loading velocities on single tubes. The results are shown in load-deformation diagrams and diagrams of deformation patterns.

Słowa kluczowe

EN

tubular structure; lateral bending; impact load; strain rate

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2013
• Tom: Vol. 51 nr 4
• Strony: 873--882
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Lipa S.

• Lodz University of Technology, Institute of Material Science and Engineering, Łódź, Poland

autor

Kotełko M.

• Lodz University of Technology, Department of Strength of Materials, Łódź, Poland

Bibliografia

• 1. Alghamdi A.A.A., 2001, Collapsible impact energy absorbers: an overview, Thin-Walled Structures, 39, 189-213
• 2. De Runtz J.A., Hodge P.G., 1963, Crushing of a tube between rigid plates, Journal of Applied Mechanics, 30, 391-395
• 3. Kotełko M., 2000, Damage mechanisms of thin-walled girders under bending with iso- and orthotropic walls (in Polish), Scientific Bulletin of Lodz University of Technology, 844, ser. Transactions, 273
• 4. Kotełko M., Lipa S., 2007, Crushing of tubular multi-member absorbers under lateral compression – experimental verification of theoretical algorithm, 24th DANUBIAADRIA Symposium on Advances in Experimental Mechanics, Romania
• 5. Kotełko M., Lipa S., Mania R.J., 2009, Dynamic crushing tests of thin-walled members under compression, Materials Engineering, 16, 1, 14-19
• 6. Lipa S., 2007, Analysis of dissipation properties of energy absorbers made of thin-walled tubes subject to crushing (in Polish), Ph.D. Thesis, Poland, Lodz University of Technology
• 7. Lipa S., Kotełko M., 2004, Numerical and experimental collapse analysis of tubular multimember energy absorbers under lateral compression, Journal of Theoretical and Applied Mechanics, 42, 4, 842-857
• 8. Perzyna P., 1963, The study of the dynamic behavior of rate sensitive plastic materials, Archive of Applied Mechanics, 15, 1, 113-129
• 9. Perzyna P., Klepaczko J., Bejada J., 1971, Application of Visco-Elesticity, Ossolineum
• 10. Wu L., Carney J.F., 1997, Initial collapse of braced elliptical tubes under lateral compression, International Journal of Mechanical Sciences, 39, 9, 1023-1036
• 11. Wu L., Carney III J.F., 1998, Experimental analysis of collapse behaviour of braced elliptical tubes under lateral compression, International Journal of Mechanical Sciences, 40, 8, 761-777