Mechanical behavior of Zircaloy-2 tubing under biaxial stresses

Effect of the hydrogen contents on the circumferential mechanical properties of zirconium alloy claddings

“…Principal stress acting on the ring tension specimen is solely a circumferential stress, i.e., σ θ . On the other hand, a principal stress on the pressurized burst specimen is the sum of a biaxial stress like the following equation according to the Hill's theory [10].…”