Slips, trips, and falls are a leading cause of injury to firefighters with many injuries occurring while traversing stairs, possibly exaggerated by acute fatigue from firefighting activities and/or asymmetric load carriage. This study examined the effects that fatigue, induced by simulated firefighting activities, and hose load carriage have on foot clearance while traversing stairs. Landing an...

A newly developed microstructure‐sensitive extreme value probabilistic framework for fatigue variability based on computational polycrystal plasticity is exercised to compare the driving forces for fatigue crack formation (nucleation and early growth) at room temperature for four different microstructure variants of duplex a Ti‐6Al‐4V alloy. The aforementioned probabilistic framew...

in this study, the effects of siraitia grosvenorii fruits extracts (sgfe) on physical fatigue were investigated. one hundred and forty-four mice were randomly divided into four groups: control group, low-dose sge-treated group, middle-dose sge-treated group and high-dose sgfe-treated group. the animals of control group received an oral administration of physiological saline in a volume of 2.5 m...

Previous studies suggest that aminopyridine may play a role in the symptomatic treatment of fatigue in multiple sclerosis. Although the mechanism underlying the beneficial effect on fatigue remains unclear, it has been proposed that aminopyridines may help to improve conduction in demyelinated central pathways, implicating both axonal and synaptic mechanisms. The objective of the present study ...

Fatigue failure is the typical failure mode of mechanical components subjected to random loadtime history. It is important to ensure that the mechanical components have an expected life with a high reliability. However, it is difficult to reduce the influence of factors that affect the fatigue reliability and thus a reliability sensitivity analysis is necessary. An approach of fatigue reliabili...

In this article, failure and fracture mechanisms in an aluminum alloy (which has been used in diesel internal combustion engines), with and without ceramic thermal barrier coatings, have been investigated under isothermal and non-isothermal fatigue loadings. In this research, the base material is an aluminum-silicon-magnesium alloy and the thermal barrier coating includes a metallic bond coat l...

With the occurrence of higher and more frequent axle loads, bridges are more solicited by fatigue loading. Bridge elements like deck slabs are subjected to a high number of stress cycles at relatively small stress magnitudes. The application of Fracture Mechanics as a useful tool for the analysis of fatigue crack growth in steel elements was demonstrated by Paris et al. in the early 1960s. With...

The initiation and growth behavior of short fatigue cracks from the interfacial micro-notches in a SCS-6/Ti composite at various maximum applied stress levels were quantitatively characterized. Micro-notches in the interfacial reaction layer were induced by applying monotonic tensile loading prior to fatigue testing. The propagation and arrest behaviors of each individual crack were carefully m...

SUMMARY The scatter in the fatigue lives of identical simple laboratory specimens, which have been tested under variable amplitude sinusoidal loading, is estimated, using a log-normal distribution of fatigue lives as a basis, from the fatigue test results of a number of experimenters. These estimates of the scatter are analyeed with 8 view to studying the effect of various teat loading paramete...

BACKGROUND As sarcoidosis is a multisytemic disorder, patients may suffer from various symptoms. The relationship between frequently reported symptoms and quality of life (QOL) has not yet been studied. OBJECTIVES The aim of the present cross-sectional study was to examine the predictive value of the most frequently reported subjective symptoms on QOL after controlling for demographic variabl...