Question

Bulk modulus is

• A. not an independent constant of material and it is always positive
• B. an independent constant of material and it can be positive or negative
• C. not a function of Poison's ratio
• D. zero for incompressible material

Answer 1

Answer:

A. not an independent constant of material and it is always positive

Bulk modulus is a ratio of direct stress to volumetric strain in a body. It is always positive and depends on applied direct stress and volumetric stress. It is also a function of Poisson's ratio. The bulk modulus of incompressible material is infinite. Elastic constants are used to determine stress and strain relationships, and for homogeneous and isotropic material, there are 4 elastic constants including young's modulus, bulk modulus, Poisson's ratio, and modulus of rigidity. Poisson's ratio is the ratio of lateral strain to longitudinal strain.