نتایج جستجو برای: fatigue of materials
تعداد نتایج: 21197044 فیلتر نتایج به سال:
Fatigue resistance of nanocrystalline commercial pure titanium obtained by hydrostatic extrusion was investigated. Coarse grained titanium and Ti6Al4V alloy were used as the reference materials. The fatigue limit and fatigue life examined at constant stress amplitude, were found to increase significantly compared to those of the coarse-grained counterparts. It is suggested that the observed imp...
background fatigue is a common symptom and one of the most important issues in community psychology. this study aimed to compare the rate and severity of fatigue in male and female students of jiroft university of medical sciences and to present appropriate solutions. material and methods this descriptive-analytical study was conducted on 200 students who were selected randomly at jiroft univer...
In the present note, the effects of two typical organic solvents, ethanol (95~) and carbon tetrachloride (99~) , on the fatigue crack propagation rates in PMMA are discussed. Fracture mechanics which has been applied successfully to fatigue crack propagat ion in bo th metallic and polymeric sheet materials [1-4] in air is adopted in the present environmental fatigue analyses. The generalized fa...
Background and Objectives: Fatigue and sleep disturbance are side effects of radiation therapy. Grape juice is a traditional product rich in antioxidants and polyphenols that have been shown to include positive effects on improving fatigue and sleep disorders. The aim of this study was to assess effects of grape juice consumption on fatigue and sleep quality in women with breast cancer undergoi...
In the past, components under fatigue loading were designed by using an S-N curve and endurance limit according to very high cycle fatigue tests [1-3], fatigue strength to failure at a given life decreases as loading cycles increase. In other words, endurance limit is not observed for most materials, which is true for axle materials for rolling stock. An axle is one of the key components for st...
Abstract Introduction: Cancer is a major health issue in Iran and in the rest of the world. Fatigue is one of the most complex and the most prevalent cancer-related problems that can affect various aspects of life for cancer patients. It can cause numerous problems. Objective: The aim of this study was to determine the level of fatigue and its associated factors in patients with cance...
Background and Aim: In the household appliances industry, because of doing work operations such as manually moving pieces by employees, there is the probability of incidence of musculoskeletal disorders and muscle fatigue. Therefore, this study aimed to investigate muscle fatigue and its relationship with the prevalence of musculoskeletal disorders among a household appliances factory employees...
Background and Aim: Endogenous opioids and addictive opiate drugs change many body functions. . Previous studies have referred to the effects of morphine on smooth and pulmonary muscles ., but the effects of opioids on skeletal muscles is not known well. Thus, the current study aimed at assessing the effect of a single dose of morphine on muscle fatigue in male rats. Materials and Meth...
Background and purpose: Fatigue is a common symptom in multiple sclerosis (MS). Available fatigue measurement tools evaluate severity or impact of fatigue and none of them can be used to guide therapists on planning fatigue management interventions. Comprehensive Fatigue Assessment Battery for Multiple Sclerosis (CFAB-MS), in addition to assessment of the fatigue, evaluates factors related to f...
Background and Aim: Many nurses are involved in work-family conflict due to the nature of the nursing profession and overwork; investigating the factors related to work-family conflict can help reduce or control this conflict. Compassion fatigue and moral distress are some of the factors that may affect the work-family conflict of nurses. The purpose of this study was to determine the mediatory...
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