Can a three-dimensional material change into a plane strain state or plane stress state when plastic deformation/destruction occurs under uniaxial tensile stress? If it can, give an example and explain

Write the constitutive law for a material with linear elastic anisotropic behavior under mechanical loading.

Stress can be related to strain. Explain by using experimental methods?

2) For a brass alloy, the stress at which plastic deformation begins is345 Mpa and the modulus of elasticity is 103GPa.a) What is the maximum load that can be applied to a specimen with area130mm² cross section without plastic deformation? b) If the original length of the specimen is 76 mm, what is themaximum length to which it can be stretched without causing deformationplastic?