Poisson’s coefficient

Ej and are respectively Young s modulus and Poisson s coefficient for the film. Furthermore, assuming that the thermal expansion coefficients are independent of the temperature, the thermoelastic stress increases linearly with the film deposition temperature. 

According to (314), a material with a negative Poisson s coefficient can be obtained either if it is very rigid (i.e. if its shear modulus fulfills the above condition) or by forming a structure with dimension less than 2 i/K (i.e., d < 2 i/K) or by combining the first and the second methods. Change of dimension of the system is impossible for continuum structures however, it is possible in fractal structures [163]. 

Fibre type Density (kg/m ) Tensile strength (MPa) Young modulus (GPa) Ultimate tensile strain (%) Thermal expansion coefficient (10- /°C) Poisson s coefficient... 

By virtue of the body s volume being invariant under deformation, Poisson s coefficient (Equation 25) for dry networks er m 0.5, and (sw Equation. 30) the Young modulus is... 

Assuming isotropic materials, the following assumption is proposed the topology of all tensors is similar to that of the elastic one. This means that for each tensor there are two unknown coefficients analogous to the Young s modulus and Poisson s coefficient (Fafard et al., 2001 Picard et al., 2008). Tensors of Eq. (30) and (31) can then be expressed as ... 

Es - modulus of elasticity of the ferrocement wall, v - Poisson s coefficient for the bulk solids (wheat). 

The tensor of stresses (Xy is related to the tensor of deformations, to lowest order, by Hooke s law. The relevant elastic constants are the Young modulus Y and the Poisson s coefficient P. 

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