Fatigue Design Basis for Zircaloy Components

A polycrystalline modeling of the mechanical behavior of neutron irradiated zirconium alloys

“…Low cycle fatigue tests in tension and compression along the transverse direction have been computed for both the unirradiated and the irradiated material, in agreement with the low cycle fatigue tests performed by Wisner et al [39]. The first thirty and a quarter cycles are computed at a fixed total strain amplitude (where the term ''amplitude" refers to half of the total peak-to-peak excursion according to [75], convention used in [39]) of E = 1% for the unirradiated material and E = 0.9% for the irradiated material. The stress-plastic strain curves are shown in Fig.…”

Vibration Compacted U02Fuel,(IV) Mechanical Response of Vibrating Fuel Rod

“…(Curves drawn in Figs. 8,9) The discrepancy between the theoretical and the observed distribution -particularly near the tube top -might be attributed to the influence of the masses of J. Nucl. Sci.…”

“…( 4 ), the above data gave as damping factor for the empty tube the approximate value of ~= 2;30 =0.0167 ( 8) which was considered small enough to be neglected in the calculation of the fundamental frequency.…”

Advanced Reactor Technologies (ART): Very High Temperature Reactor (VHTR) Research and Development (R&D) Quarterly Report

“…A hypothetical mean stress curve was developed using the process used to develop the I-9.5 mean stress curve. 1 A paper by O'Donnell and Langer 5 shows the development of the maximum mean stress correction for Zr in detail and the method has been used for analysis of Alloy 617. The method utilizes the Goodman diagram with maximum mean stress equation…”