Consider a cylindrical test specimen under a confining pressure of 3,000 psi and an axial stress of 3,000 psi with compression positive, so that in cylindrical coordinates
σzz = 3,000 σrr = 3,000 σθθ = 3,000
τrz = 0.0 τzθ = 0.0 τθr = 0.0
1 εrr , εzz , εθθ , γrz , γzθ , γθr ;
2 The axial stress σzz required to maintain a zero axial strain;
3 The strain energy and strain energy density, if the test specimen is an NX core with a height to diameter ratio of two.
Note: E = 2.4 × 106 psi, ν = 0.20, and the sample is isotropic.