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
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 + %
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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