Deformation characteristics of CFRP bi-stable composites according to negative initial curvature

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.

[1]  M. Cho,et al.  Twisted shape bi-stable structure of asymmetrically laminated CFRP composites , 2017 .

[2]  Maenghyo Cho,et al.  A Study on the Room-Temperature Curvature Shapes of Unsymmetric Laminates Including Slippage Effects , 1998 .

[3]  C. Hong,et al.  Effect of residual shear strain on the cured shape of unsymmetric cross-ply thin laminates , 1990 .

[4]  Kyu-Jin Cho,et al.  Generalized curvature tailoring of bistable CFRP laminates by curing on a cylindrical tool-plate with misalignment , 2014 .

[5]  Valeria La Saponara,et al.  Design and development of hybrid composite bistable structures for energy absorption under quasi-static tensile loading , 2010 .

[6]  P. Hagedorn,et al.  A piezoelectric bistable plate for nonlinear broadband energy harvesting , 2010 .

[7]  Kyu-Jin Cho,et al.  Flytrap-inspired robot using structurally integrated actuation based on bistability and a developable surface , 2014, Bioinspiration & biomimetics.

[8]  M. Cho,et al.  Saddle-shaped, bistable morphing panel with shape memory alloy spring actuator , 2014 .

[9]  Marc R. Schultz,et al.  A Concept for Airfoil-like Active Bistable Twisting Structures , 2008 .

[10]  Paul M. Weaver,et al.  Bistable plates for morphing structures: A refined analytical approach with high-order polynomials , 2010 .

[11]  Kyu-Jin Cho,et al.  Curvature tailoring of unsymmetric laminates with an initial curvature , 2013 .

[12]  Michael W. Hyer,et al.  Calculations of the Room-Temperature Shapes of Unsymmetric Laminatestwo , 1981 .

[13]  Zhengneng Li,et al.  Cured Shape of Cross-Ply Composite Thin Shells , 2003 .