Simulations of the properties of elongated hexagonal dodecahedron systems

• Autorzy: Grima J. N. , Caruana-Gauci R. , Attard D. , Gatt R.
• Języki publikacji: EN

Abstrakty

EN

This study considers a 3D basic unit-cell proposed for auxetic and non-au xetic foams namely the elongated hexagonal dodecahedron deforming through changes in angle b etween its ligaments (idealised hinging model). This structure was studied in detail for the potential of exhibiting negative Poisson’s ratio and/or negative compressibility b y means of a method based on standard force-field molecular modelling technique, termed as Empiri cal Modelling Using Dummy Atoms ( EMUDA ). The mechanical properties obtained from this method were then compared to a previously published analytical model of this structure [Grima J N, CaruanaGauci R, Attard D, and Gatt R 2012, Proc. Roy. Soc. A 468 3121], and found to be in good agreement with each other. The results showed that this system can ex hibit zero Poisson’s ratios in one of its planes and positive or negative Poisson’s ratios in other plan es, depending on the geometry of the model. It was also shown that under certain conditions, ne gative linear and/or area compressibility was also exhibited.

Słowa kluczowe

EN

auxetic; empirical model; negative Poisson's ratio; negative compressibility; cellular structure; foams

PL

model empiryczny; ujemny współczynnik Poissona; negatywne ściśliwości; struktura komórkowa; pianki

• Wydawca: Politechnika Gdańska
• Czasopismo: TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
• Rocznik: 2014
• Tom: Vol. 18, No 2
• Strony: 117--135
• Opis fizyczny: Bibliogr. 16 poz., rys., tab., wykr.

Twórcy

autor

Grima J. N.

• Metamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, Malta
• Department of Chemistry, Faculty of Science, University of Malta, Msida MSD 2080, Malta

autor

Caruana-Gauci R.

• Metamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, Malta

autor

Attard D.

• Metamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, Malta

autor

Gatt R.

• Metamaterials Unit, Faculty of Science, University of Malta, Msida MSD 2080, Malta

Bibliografia

• [1] Evans K E, Nkansah M A and Hutchinson I J 1994 Acta Metall. Mater. 42 1289
• [2] Grima J N 2000 New Auxetic Materials, PhD Dissertation, University of Exeter, UK
• [3] Chircop Bray T G 2005 Empirical Modelling of ‘Negative Structures’ using molecular modelling techniques , B. Sc. (Hons.) Dissertation, University of Malta, Malta [4] Grima J N, Gatt R, Chircop Bray T G, Alderson A, and Evans K E 2005 Molecular Simulation 31 915
• [5] Chircop Bray T G 2007 EMUDA modelling of 2D and 3D auxetic systems , M. Sc. Dissertation, University of Malta, Malta
• [6] Lakes R S 1987 Science 235 10838
• [7] Wojciechowski K W and Branka A C 1989 Physical Review A 40 7222
• [8] Evans K E, Nkansah M A, Hutchinson I J and Rogers S C 1991 Nature 253 124
• [9] Milton G W 1992 J. Mech. Phys. Sol. 40 1105
• [10] Yeganeh-Haeri A, Weidner D J and Parise J B 1992 Science 257 650
• [11] He C, Liu P and Griffin A C 1998 Macromolecules 31 3145
• [12] Alderson A 1999 Chem. Ind. 384
• [13] Evans K E and Alderson A 2000 Adv. Mater. 12 617
• [14] Scarpa F and Tomlin P J 2000 Fatigue Fract. Eng. Mater. 23 717
• [15] Baughman R H 2003 Nature 425 667
• [16] Grima J N, Caruana-Gauci R, Attard D, and Gatt R 2012 Proc. Roy. Soc. A 468 3121