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Advanced materials and smart structures

Keywords: shape memory alloy, FGMs, FRP, multistable structure, Carbon Nanotubes, Variable Angle Tow.
Fig. 1. Multistable corrugated plate (Gentilini).
Fig. 2. Spherical shell (Tornabene).
Advanced materials and smart structures - Fig. 3
Fig. 3. Agglomeration model for CNTs (Tornabene).
Fig. 4. Through-the-thickness variation of the mechanical properties of a FGM structure (Tornabene).

The research focuses on advanced ad-hoc developed formulations and numerical analysis for modeling the behavior of structural components constituted by innovative materials. Recently, a research line on morphing/bistable structures has been started in collaboration with the Department of Engineering at the University of Cambridge.

Morphing structures can undergo large changes of shape without plastic deformations giving the potential for large improvement in cost, weight and reliability.

The research touches numerical simulations for the analysis of shape and stiffness control of slender structures using shape memory alloys components.

The following topics are under study:

  • Functionally Graded Materials (FGMs) and Functionally Graded Carbon Nanotube (FGCNT) reinforced plates and shells;
  • interface behaviour in FRP reinforced structures;
  • enhanced strength in FRP wrapped concrete columns. The flexural behaviour of concrete beams cracked and strengthened with fiber reinforced polymers has been studied based on fracture mechanics concepts. The dynamic behaviour has been investigated too, for estimating the variations due to cracking and subsequent strengthening on vibration modes, frequencies and damping;
  • multistable structures (corrugated plates); o finite element approaches for electroelasticity problems;
  • finite element approaches for laminated composites;
  • laminated panels with curvilinear reinforcing fibers (Variable Angle Tow composites).

Main publications

I. Elishakoff, D. Pentaras, C. Gentilini (2016). Mechanics of functionally graded materials structures, World Scientific Publishing Co.

F. Tornabene, N. Fantuzzi, M. Bacciocchi, E. Viola. (2016) Effect of Agglomeration on the Natural Frequencies of Functionally Graded Carbon Nanotube-Reinforced Laminated Composite Doubly-Curved Shells, Composites Part B Engineering 89, 187-218.

F. Tornabene, N. Fantuzzi, M. Bacciocchi, E. Viola. (2015) Higher-Order Theories for the Free Vibration of Doubly-Curved Laminated Panels with Curvilinear Reinforcing Fibers by Means of a Local Version of the GDQ Method, Composites Part B Engineering 81, 196-230.

G. Castellazzi, C. Gentilini, P. Krysl, I. Elishakoff. (2013) Static analysis of functionally graded plates using a nodal integrated finite element approach. Composite Structures 103, 197- 200.

F. Tornabene, E. Viola. (2013) Static Analysis of Functionally Graded Doubly-Curved Shells and Panels of Revolution. Meccanica 48(4), 901-930.

F. Tornabene, N. Fantuzzi, E. Viola, J.N. Reddy. (2013) Winkler-Pasternak Foundation Effect on the Static and Dynamic Analyses of Laminated Doubly-Curved and Degenerate Shells and Panels. Composites: Part B Engineering 57, 269-296.

F. Tornabene, E. Viola, N. Fantuzzi. (2013) General Higher-order Equivalent Single Layer Theory for Free Vibrations of Doubly-Curved Laminated Composite Shells and Panels. Composite Structures 104, 94-117.

S. de Miranda, L. Patruno, F. Ubertini. (2012) Transverse stress profiles reconstruction for finite element analysis of laminated plates. Composite Structures 94, 2706-2715.

F. Daghia, D.J. Inman, F. Ubertini, E. Viola. (2010) Active shape change of an SMA hybrid composite plate. Smart Structures and Systems, An International Journal. Vol. 6 (2), 91-100.

C. Gentilini, L. Nobile, K.A. Seffen. (2009) Numerical analysis of morphing corrugated plates. Procedia Engineering, Vol. 1 (1), 79-82.

C. Gentilini, K.A. Seffen, S.D. Guest, L. Nobile. (2008) On the effect of prestress on the bistable behaviour of tape-springs. Proceedings II AESATEMA International Conference on Advances and Trends in Engineering Materials and their Applications. Cesena, Italy, 1-5 September 2008.

C. Gentilini, K.A. Seffen, S.D. Guest, L. Nobile. (2008) On the behaviour of corrugated plates in bending. Proceedings II AES-ATEMA International Conference on Advances and Trends in Engineering Materials and their Applications. Cesena, Italy, 1-5 September 2008.

F. Daghia, S. de Miranda, F. Ubertini, E. Viola. (2008) A hybrid stress approach for laminated composite plates within the First-order Shear Deformation Theory. International Journal of Solids and Structures. Vol. 45, 1766-1787.

B. Bonfiglioli, A. Strauss, G. Pascale, K. Bergmeister. (2005) Basic study of monitoring on fibre reinforced polymers: theoretical and experimental study. Smart Materials and Structures. Vol. 14, S12-S23.

Covezzi F., de Miranda S., Marfia S., Sacco E. (2016) Complementary formulation of the TFA for the elasto-plastic analysis of composites, Composite Structures, in press.

Research projects

Active and passive reinforcements by means of composites for the technologic innovation of the civil structures., PRIN2002 – Bologna Research Unit. Coordinator: Prof. G. Pascale.