Mechatronic Systems Engineering 3301A/B Lecture Notes - Lecture 35: Thermal Conductivity, Modulus Guitars
19 Aug 2020
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Document Summary
Cellular structures are hybrids of a solid and a gas. Some properties depend on gas properties thermal conductivity. There are two distinct species of cellular solid. The distinction is most obvious in their mechanical properties. When the lattice is loaded, its members carry tension or bending moments (a) Unconstrained if welded, deforms in bending constrained by the cross-beam carries loads in tension welding has little influence on stiffness/strength over-constrained (b) (c) causing possible self-stress, however guarantees loading in tension. Foaming creates bending-dominated structures with lower modulus and density. Lattices that are stretch-dominated have moduli that are much greater than those of foams of the same density. Lattices are generally stiffer than lattices of a given material and density. When a foam made of a plastic material is loaded beyond its elastic limit, the cell edges bend plastically. An elastomeric foam, by contrast, collapses by the elastic buckling of its cell edges.
