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Fatigue - Wiley Online Library

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Last Updated: 04 June 2022

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Selective maintenance of multi‐state systems with the repairperson fatigue effect and stochastic break duration

"However, the current selective maintenance studies neglect the effects of fatigue on work rate, which leads to underestimating the duration of maintenance activities and overestimating the system's reliability. " To solve the above challenges, a new selective maintenance scheme for multi-u2010state systems is developed to increase the mission's availability. Work time's decline, in a piecewise decreasing exponential process of working time, is referred to as a piecewise continuous increasing exponential function of working time. The universal generation function method is used to determine the multi-state system reliability in considering the stochastic break duration, which is based on the state probability distribution of each component obtained by the Markov model. The resulting selective maintenance optimization problem is solved by a tailored genetic algorithm," Carn says, considering both maintenance tasks and maintenance as decision variables.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/qre.3146


Different effects of multiscale microstructure on fatigue crack growth path and rate in selective laser melted Ti6Al4V

"In this report, Ti6Al4V specimens made by SLM were heat treated at two different temperatures. " The prior u03b2 grains influenced the macroscopic fracture morphology, but there was no discernible effect on the FCG rate, according to the study, which was then conducted at room temperature, but there was no apparent effect on the FCG rate. The morphology of the u03b1 phase influenced the crack growth path and the FCG rate. "The decrease in the FCG rate can be explained by changes in the strengthu2010toughness relationship triggered by heat treatment.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/ffe.13757


Railway wheelset fatigue life estimation based on field tests

"Axle bending strains were measured and processed to obtain axle stress spectra. " The variations of axle stress spectra as a result of changes in railway operation parameters were determined by statistical methods to investigate axle stress spectra due to changes in railway operation parameters. Measured axle stress spectra can be modelled using truncated normal distributions, where the overwhelming majority of measured stress amplitudes are lower than 50 MPa. "Our research revealed that fatigue damage could possibly begin on axles suffering from rust or small surface cracks/scratches. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1111/ffe.13756


Physiocognitive Modeling: Explaining the Effects of Caffeine on Fatigue

"Most computational models of cognition lack a representation of physiology. " This study integrates physiologically based pharmacokinetic model simulations of caffeine levels in blood and tissues with ACT-u2010R's fatigue module to predict the effects of caffeine on fatigue. The correlation between PBPK model parameters and the ACT'u2010R model parameters is demonstrated by the neuroscience literature and established connections between ACT u2010R modules and brain regions. Multiple success metrics are used to adjust procedural parameters in the fatigue module to clarify caffeine's effects on multiple performance outcomes.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/tops.12615


Mechanical, wear and fatigue behavior of silane‐treated corncob biosilica toughened epoxy resin composite reinforced with prickly pear short fibers

"This research focused on investigating the mechanical, wear, and exhaust behavior of an epoxy composite reinforced with corncob biosilica and prickly pear fiber. " The primary aim of this study was to increase the load bearing capacity of high-u2010brittle matrix by including eco-friendly fiber and particles. The surface treatment of the fabric and particle was achieved using an amino silane, 3u2010Aminopropyltrimethoxysilane. Hand layup process and analysis are applied to ASTM specifications, making natural fiber composites ready for processing.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/pc.26761


Electroacupuncture at BL15 attenuates chronic fatigue syndrome by downregulating iNOS/NO signaling in C57BL/6 mice

"Our previous clinical studies have shown the benefits of electroacupuncture on CFS patients, but the exact mechanism of EA on CFS remains unclear. " In this research, we investigated the effects of EA on cardiac function in a CFS mouse model to determine its underlying mechanism. After behavioral evaluations and echocardiographic testing, blood and heart tissue of the mice were collected for biochemical analysis, and then we evaluated the effects of EA on the CFS mouse model when nitric oxide levels were increased by lu2010arginine, the mice's CFS mouse model was evaluated. Meanwhile, EA reduced the production of inducible nitric oxide synthase in heart tissue and serum NO levels in mice subjected to continuous forced swimming stress. According to this report, EA could increase the motor control and cardiac function in CFS mice, and its effects could be attributed to the down-regulation of iNOS/NO signaling. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1002/ar.24953


Fracture mechanics and hot spot stress‐based fatigue life calculation: Case study for a crane runway girder

Two critical joints are fatigued by load spectra based on real operational results, hot spot distress, and XFEM-based fracture mechanics simulations are performed to determine the fatigue characteristics of two critical joints. During the fatigue crack growth simulations, the aspect ratio must not be assumed to be constant. Finally, it has been reported that the transition from one submodel to a subsequent is crucial for the accuracy of the fatigue crack growth simulations.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/ffe.13729


Developments in remeshing‐free fatigue crack growth simulation including a new adaptive virtual crack closure technique

In Abaqus, two new FEM2010VCCT and XFEMPNVCCT algorithms help measure and improve the remeshing crack growth simulation and life estimation. " Despite the success of this strategy in increasing productivity, reducing the runtime, and preventing potential mistakes, it has been found that the XFEMPNu2010VCCT software contains some inherent flaws, including a major overestimation in FCG life forecasts. It has been recently found that the adaptive VCCT will greatly improve FCG simulation and life estimation's accuracy. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1111/ffe.13735


A Secondary Analysis of Patient Assisted Intervention for Neuropathy: Comparison of Treatment in Real Life Situations (PAIN‐CONTRoLS): Pain’s Impact on Sleep, Fatigue, and Activities of Daily Living

"The aim of this research was to determine the effect of nortriptyline, duloxetine, pregabalin, and mexiletine in patients with cryptogenic sensory polyneuropathy (Certy) disease in patients with cryptogenic sensory polyneuropathy. " Mexiletine had the highest quit rate due to digestive side effects, but nortriptyline and duloxetine had the lowest quit rates. Mexiletine had the highest chance of positive outcomes for pain reduction and fatigue improvements in pain interference and exhaustion if continued for the full 12 weeks of the study. There was no significant difference between the drugs for sleep apprehension or SF201012 ratings. Physicians with CSPN should try mexiletine to treat pain and exhaustion, but physicians with sedentary disorders should try to treat pain and exhaustion, while injecting nortriptyline and duloxetine are better medications to start first since they are more tolerated. Future research may include reviews of other commonly used CSPN drugs in order to determine evidence-based treatment recommendations. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1002/mus.27637


The influence of Chinese herbal medicines on cancer‐related pressure ulcer wound, fatigue, constipation, and anorexia: A meta‐analysis

"We determined the odds ratio with 95% confidence intervals to determine the impact of Chinese herbal medicines on cancer-related pressure ulcer wounds, hunger, constipation, and anorexia using the dichotomous method with a random or fixed effect model using a random or fixed effect model. " Compared to control in studies with cancer-related disorders, Chinese herbal medicines had dramatically higher success in treating pressure ulcer wound, exhaustion, and effectiveness on treating constipation. However, Chinese herbal drugs had no effect on treating anorexia compared to placebo in children with cancer-related illnesses. Compared to placebo in patients with cancer-related illnesses, Chinese herbal medicines had significant improvement in treating pressure ulcer wound, treating pressure ulcer wound, exhaustion, and constipation. However, Chinese herbal medications had no effect on the success of treating anorexia in comparison to control in subjects with cancer-related diseases.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/iwj.13833

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions