By Teik-Cheng Lim

This e-book lays down the root at the mechanics and layout of auxetic solids and buildings, solids that own unfavourable Poisson’s ratio. it is going to gain teams of readers: (a) practitioners, equivalent to product and structural designers, who have to regulate mechanical rigidity distributions utilizing auxetic fabrics, and (b) educational researchers and scholars who intend to provide designated mechanical and different actual houses of buildings utilizing auxetic fabrics.

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7 Auxetic Yarns and Textiles 33 Fig. 24 SEM images of a conventional and b auxetic open cell foam by Bianchi et al. (2008). With kind permission from Springer Science+Business Media 34 1 Introduction Fig. 25 Experimental data relating the variation of Poisson’s ratio with variation in: a final density ratio, b tangent modulus, and c energy dissipation Bianchi et al. (2008). 7 Auxetic Yarns and Textiles 35 Fig. 26 The acoustic absorption coefficients of conventional, auxetic and auxetic MR-coated PU foams measured by Scarpa and Smith (2004).

The Poisson’s ratio under tension as shown in Fig. 19a is non-linear due to the alignment of cell ribs at large strain, thereby inducing stretching in addition to hinging and bending, while the nonlinearity of Poisson’s ratio under compression as shown in Fig. 19b arises from buckling or contact before yield strain is attained (Chan and Evans 1999a). 22 1 Introduction Fig. i. reticulated auxetic polyester polyurethane foam (PEAO); a unloaded, b under tension and c under compression Chan and Evans (1997b).

22a shows the behavior of the Poisson’s ratio in relation to changes in the time and temperature of processing for the blue, large cell foam, in which a region of minimum Poisson’s ratios extends from about 100 °C and 12 min, through 24 1 Introduction Fig. i. auxetic foam: a tension, and b compression Chan and Evans (1999a). Reprinted by permission of SAGE 110 °C and 8 min, to 120 °C and 5 min. The time constant due to thermal conductivity of the foam is such that processing for 5 min or less will not transform the entire sample, and that the samples produced in the regime of high temperature and long time were too soft to remove immediately from the mold (Brandel and Lakes 2001).

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