Deformation characteristic of CFRP bi-stable composites according to negative initial curvature is discussed, and twisted shape bi-stability of CFRP composites is introduced. Initial curvature of composites has effect on final curvature of bistable composites. Positive initial curvature tailor final curvature linearly. However, some negative initial curvature induces twisted shape bi-stability. CFRP laminated composites have three different final state (i.e. conventional shape bistability, mono-stability, and twisted shape bi-stability) according to initial curvature. Twisted shape bi-stable composites have different curvature changing characteristic from conventional shape bi-stable composites. In order to analysis effect of initial curvature, analytical model that include force and moment equilibrium is proposed. FE simulation results and analytical results are compared to verify the proposed analytical model. It is verified that some range of negative initial curvature induce losing of bi-stability or twisted shape bi-stability by analytical model. Final state shape of three different state is analyzed by FE simulation and analytical model. Final states shape from two different analyses are well matched each other in three different state.

Date Published: 11 April 2017
PDF: 8 pages
Proc. SPIE 10165, Behavior and Mechanics of Multifunctional Materials and Composites 2017, 101651L (11 April 2017); doi: 10.1117/12.2259909

Published in SPIE Proceedings Vol. 10165:
Behavior and Mechanics of Multifunctional Materials and Composites 2017
Nakhiah C. Goulbourne, Editor(s)