what is dynamic modulus of elasticity and its relationship with poisons ratio
Dynamic modulus (sometimes complex modulus) is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelastic materials.
the ratio of the stress in a body to the corresponding strain (as in bulk modulus, shear modulus, and Young's modulus) — called also coefficient of elasticity, elastic modulus
Young's modulus will change, since Young's modulas is directly proportional to the ratio of stress and strain. ... Then cross sectional area here I represent as thickness hence when there is a change in cross sectional area it ultimately changes the stress applied and that leads to change in Young's modulus.