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A comparison of novel and conventional fabrication methods for auxetic foams for sports safety applications

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Figure

Figure 1 Photograph showing (a) Oversized foam cuboid with through-thickness pins inserted, (b) Insertion of pins and foam into lower section of mould, (c) Cuboidal mould assembly with through-thickness pins, d) Cuboidal auxetic sample fabricated with thro
Figure 2 (a) Sample true axial vs. lateral strain plot from marker tracking used in Poisson's ratio calculation of an auxetic sample fabricated as a cuboid without through thickness pins (including fitted linear trend line used to calculate Poisson's ratio
Figure 4 (a) Sample stress strain plots for load/unload tests [selected samples], (b) Specific strain energy absorbed  for hysteresis tests to  0.2, 0.5 and 0.8 Compressive Engineering Strain [error bars represent +/- 1 S.D.]
Figure 5 (a) Acceleration/time trace for sample created in a cuboidal mould with through-thickness pins under a 15 J impact, (b) Acceleration/time trace for sample cut from the outside of the cubic monolith under a 15 J impact, (c) Sample acceleration/time

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