Hooke's Law Assumptions

What is the assumed material behaviour for using Hooke’s Law?

-All materials are homogeneous

-All materials are isotropic

-A linear and plastic relationship is assumed between stress and strain

What is the assumed loading conditions for using Hooke’s Law?

-All deformations are quasi-static (extremely slow)

-Material time dependency is negligible

-All temperatures are constant

-All strains are small (<5%)

What is the meaning of ‘All materials are homogeneous’?

-No changes in the material density throughout therefore no weak or hard spots

-If you apply the same stretch or force to the material at any point it will deform the exact same way

What is the meaning of ‘All materials are isotropic?

-The material has identical mechanical properties in every direction

-3 examples are stiffness, youngs modulus and poissons ratio

What is the meaning of ‘The material’s time dependency is negligible’?

-The material responds to stress instantly

-Its behaviour does not change depending on how long the load is applied for or how fast its applied