There has been some interesting research dealing with materials that have negative values of Poisson’s ratio; recall from fundamental theory–1≤ v≤ 1/2. Beginning studies of this concept were done by Lakes (1987) and commonly these types of materials have specialized internal microstructures (e.g., foams and cellular solids) that produce such anomalous behavior. Several interesting consequences occur with v

Fig 13.6

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Stress Concentration Factor 2.2 2.15 2.1 2.05 2 1.95 1.9 O 0.1 0.2 0.3 Poisson Ratio 0.4 0.5