Design of hybrid material-Part 2

Design of hybrid material-Part 2 - Design of hybrid...

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-Sandwich structures - Lattice/Foam - Segmented Design of hybrid material
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Sandwich panels-Hybrid type 2 Sandwich structures combines two materials such that one forms the faces, the other the core, to give a structure of high bending stiffness and strength at low weight. Physics behind that: increase of the moment of inertia I , and section modulus Z The faces carry most of the load, they must be stiff and strong. The core occupies most of the volume. It must be light, stiff and strong
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Design variable of sandwich panel
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Mechanical properties of S.P Density: is given exactly by the rule of mixture, replace f by 2t and ( 1-f) by c Strength: Upper bound: Lower bound 2 2 1 f c t t d d ρ ρ ρ = + - % ( 29 ( 29 // // , Least of , f L y y f c f c E E E E σ σ σ = % % % // :in-plane modulus, given by the rule of mixture E % // : 2 f c E tE cE + % ( 29 ( 29 , : 2 f u y y f c t c σ σ σ + %
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Mechanical properties of S.P ( 29 ( 29 3 3 sand 2 3 3 sand 1 1 ( ) or 12 1 2 1 ( ) 12 w f f c w f s S EI d c E BE tc G L S EI d c E K = = - + = = - Stiffness/width Shear modulus of the core Constant, depends only on the mode of loading Knock-down stiffness
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Values of the constant B Sandwich as a material 3 sand 3 3 3 ( ) 12 2 1 1 flex flex f s f s d EI E c t E E K E K d d = = - = - % %
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