1. Determining elastic properties

1.1 General information. Definitions

The number of elasticity constants is reduced by material symmetries. There are only two constants for isotropic materials. A distinction is then made between :

• the Young's modulusE such that in a uniaxial test :

  σ = E ε

• the Poisson's ratioν such that in a uniaxial test :

  ν = – ε ₂ /ε ₁

  ratio of radial strain ε ₂ ...