The Tethered BOP system arrests the motion of the BOP stack above the wellhead, substantially reducing wellhead cyclic stresses and enhancing fatigue life
. Depending on the specific riser and wellhead configuration, fatigue life
has been improved by as much as 1,000 times the original unmitigated wellhead fatigue.
After the optimization, fatigue analysis was carried out on the entire structure of the pressure vessel to caluclte the fatigue life
This can extend the fatigue life
of many parts by 10 to 20 times, enhance metal fatigue life
, lower costs as well as minimise downtime.
In this paper, the constant amplitude fatigue test was applied to research the fatigue life
of rocklike fractured specimens, and the suitable fatigue life
models were selected.
"Effects of System Design on Fatigue Life
of Solder Joints in BGA Packages Under Vibration at Random Frequencies"
The force is absorbed into the hose's reinforcing fibers, therefore since the Verderflex hose has more fibers, it can spread that load out over a greater number of elements, thus reducing the stress per fiber and extending fatigue life
. It's remarkably simple, but Verder Pumps is the only one that does it.
 observed on the partially PC beams with corroded rebars and found out that the fatigue life
of the beams decreases and the rate of the stiffness degradation and the midspan deflection development grows with the corrosion ratio increasing.
To date, many efforts have quantified the fatigue life
with numerical and experimental investigations via deterministic analyses, which assures the prediction security for fatigue life
by relatively conservative results [5-7].
Kim and Hwang  investigated the effect of underfill on the fatigue life
of a plastic ball grid array (PBGA) package for space usage under random vibration excitation of the launch.
Due to the large discreteness of concrete and many other influence factors, there is no effective method to predict the fatigue life
of concrete, and existing studies usually predict the fatigue life
of concrete with the cumulative damage theory.