materjali elastsust iseloomustav näitaja: normaal-, nihke- ja mahtelastsusmoodul ning Poissoni tegur (vt elastsus), property of materials: the ratio of stress to strain for different modes of elastic deformation; in isotropic elastic materials only four constants are needed to characterize fully the elastic behavior of the material: Young`s modulus, shear modulus, bulk modulus and Poisson`s ratio (see: elasticity)