Micromechanics of closed-cell foams

摘要: This chapter is designed to elucidate micromechanics of closed-cell foams. Closed-cell foams made from Polystyrene (PS), Polyethylene (PE), and Polypropylene (PP) are mainly used for packaging or impact protection. Their mechanical properties dominated by the polymer contribution. In contrast, soft foams, such as Ethylene–Vinyl Acetate (EVA) copolymer in midsoles training shoes contribution cell gas because has a low crystallinity, consequently, Young's modulus. The prime subject modeling foam compressive response. reviews deformation mechanisms elastic moduli. These relevant cores sandwich beams, where deflection design criterion. Moduli considered before high-strain mechanics thermoplastic involves three interacting levels: microstructure that affects its response; edges can be beams; faces membranes. Cell geometry statistics shape size, measures regularity.