Numerical modeling of auxetics in structure strength

• Autorzy: Stanisławek S. , Morka A. , Niezgoda T.
• Języki publikacji: EN

Abstrakty

EN

The paper deals with computer simulations of mechanical behaviour of a no-void ideal auxetic isotropic material. Current literature offers wide range of models which resemble the manufactured or natural structures. However, it does not answer the question how a change into auxetic no-void state would affect the continuum effective mechanical properties. Auxetic with the Poisson ratio -0.3 has been compared through typical tests to a classic steel elastic material. Most of the engineering software cannot precede Poisson ratio helow zero. Therefore a unique technique was applied using equation of state to overcome this obstacle. All simulations have been done in elastic regime. For the tensile compression tests a 10 mm edge cube was modelled, the bending test used a 5x5x250 mm bar. The loading for initial tests was realized as a kinematic displacement of particular nodes. For bar bending a force was applied in the middle of the beam. The finite element method has been used with explicit time integration algorithm implemented in commercial software with one integration point brick elements. Specific properties have been observed for each test, for tensile test auxetic showed higher strength while for compression material was weaker. Logically the bending test showed no clear influence of negative Poisson to material strength. Further simulations as a shear or impact tests are planned.

Słowa kluczowe

EN

computational mechanics; auxetics; negative Poisson's ratio; material engineering

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 4
• Strony: 459--462
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Stanisławek S.

autor

Morka A.

autor

Niezgoda T.

• Military University of Technology Department of Mechanics and Applied Computer Science Gen, S. Kaliski 2 Street, 00-908 Warsaw, Poland tel: [phone],fax: [phone],

Bibliografia

• [1] Grima, J. N., Jackson, R., Alderson, A., Evans, K. E., Adv. Mater., 12, 1912, 2000.
• [2] Yeganeh-Haeri, A., Weidner, D. J., Parise, J. B., Science, 257, 650, 1992.
• [3] Baughman, R. H., Shacklette, J. M., Zakhidov, A. A., Stafstrom, S., Ibid., 392, 362, 1998.
• [4] Lethbridge, Z. A. D., Williams, J. J., Walton, R. I., Smith, C. W., Hooper, R. M., Evans, K. E., Direct, Static Measurement of Single-Crystal Young’s Moduli of the Zeolite Natrolite: Comparison with Dynamic Studies and Simulations, Acta Materialia, Vol. 54, pp. 2533-2545, 2006.
• [5] Bianchi, M., Scarpa, F. L., Smith, C. W., Stiffness and Energy Dissipation in Polyurethane Auxetic Foams, J Mater Sci., Vol. 43, pp. 5851-5860, 2008.