Fig. 11.1 320 kg/m3 (20 pcf) rigid polyurethane foam cell geometry and 12 inch tall billet Fig. 11.2 Typical stressstrain curves for 176 kg/m3 (11 pcf) polyurethane foam subjected to either uniaxial compression or uniaxial tension Fig. 11.3 Cell walls compressed against neighboring cell walls when 176 kg/m3 (11 pcf) polyurethane foam is compressed into the lock-up regime and then unloaded 90 M.K. Neilsen et al.
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