Pitting corrosion is one of the most common forms of localized corrosion. Corrosion pit results in a stress concentration and fatigue cracks usually initiate and propagate from these corrosion pits. Aging structures may fracture when the fatigue crack reaches a critical size. This paper experimentally simulates the effects of pitting morphologies on the static and fatigue behavior of steel bars...

This report presents an evaluation of three commercially available fatigue monitors (the Onguard eye closure monitor, a head nodding monitor-Dozer's Alarm, and an analogue of the Roadguard reaction time monitor) based on laboratory testing. The devices showed an ability to detect fatigue in some cases but were not able to maintain alertness and thus prevent performance deterioration. There were...

PURPOSE The purpose of this study was to examine physiological responses of persons with chronic fatigue syndrome (CFS) to a graded exercise test. METHODS Cardiopulmonary exercise tests were performed on 189 patients diagnosed with CFS. Based on values for peak oxygen consumption, patients were assigned to one of four impairment categories (none, mild, moderate, and severe), using American Me...

(d) Mechanical propert, Defiexion method, brittle coating method, bonded wire technique, moist coating method, vibration methods involving frequency and damping or damping changes during fatigue test. (e) Penetrating radiation tests. (f) Ultrasonic testing Reflection or through transmission methods. (g) Magneto-inductive tests. (h) Electrical tests. Electrical resistance or tribo-electrical met...

The paper proposes a model of a fatigue device for testing dedicated to ankle prostheses. The concept of the testing device relies on two aspects: almost any type of ankle prosthesis can be tested on it and it has to work on INSTRON axial-torsion testing machine. Starting from these requirements, a 3D functional assembly that reproduces the real movement of the ankle joint during gait cycle has...

The Schwartz Cancer Fatigue Scale is a short, clinically relevant, well-tested instrument that measures two dimensions of cancer-related fatigue (physical and perceptual). The scale has been tested in heterogeneous patients during and following treatment and against other measures of fatigue. It continues to be a robust and parsimonious measure of fatigue. The Schwartz Cancer Fatigue Scale (SCF...

We evaluated friction fatigue-induced changes in the microstructure and residual stress of carburized steel. By eddy current testing (ET) x-ray diffractometry (XRD), voltage rate (after/before fatigue testing) obtained by ET had a strong correlation with retained austenite phase full width at half maximum XRD. The results are useful for analysis damage

Although bulk silicon is not known to exhibit susceptibility to cyclic fatigue, micron-scale structures made from silicon films are known to be vulnerable to degradation by fatigue in ambient air environments, a phenomenon that has been recently modeled in terms of a mechanism of sequential oxidation and stress-corrosion cracking of the native oxide layer. To date, most stress-life (S=N ) fatig...

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...

Fatigue is the major threat in service of steel structure subjected to fluctuating loads. With the additional effect of corrosion and presence of weld joints the fatigue failure may become more critical in structural steel. One of the apt examples of such structural is the sailing ship. This is experiencing a constant stress due to floating and a pulsating bending load due to the waves. This pa...