This proposed research program will seek to learn the failure mechanisms of multidirectionally woven carbon-carbon composites when subjected to fatigue leading, and characterize this material's potential for use in internal prosthetic devices, e .g . hip and knee implants . Carbon-carbon composites are graphite fiber bundles embedded in a carbon matrix . Currently, implants are made of metals s...

Weight reduction is becoming increasingly important in products that undergo cyclic loading, such as cars, aeroplanes, wind turbines, etc. The novelty of these dramatic design changes will cause material fatigue to become one of the key design drivers in the development of cars, aeroplanes, wind turbines and require tools to accurately predict the life time of a construction. The life time can ...

shot peening applies a residual compressive stress field (rcsf) on the surface of parts. it also shifts “crack nucleation sites” to sub-surface locations. a nondestructive method of measuring the stresses, sin2ψ was utilized here and the stress values introduced to ansys software. for this purpose, uniform stress in all directions was applied on the con rod. loading on the rod in ansys had thre...

conclusions our findings indicate that fatigue and disability may affect a patient’s quality of life. although mobility may affect the overall quality of life in patients with multiple sclerosis, it may also affect the physical health of ms patients. therefore, the identification of factors affecting the quality of life in ms patients may help in predicting the quality of life, and designing a ...

The effect of an electroless Ni-Cu-P coating on the fatigue behavior of quenched and tempered CK45 steel has been investigated. The fatigue tests under rotating bending conditions have been conducted in three different conditions of uncoated, as-deposited and shot peened prior to the coating deposition. The results indicate that plating of the base steel leads to a fatigue life reduction. The d...

Working in monotonous environment often causes lack of concentration or fatigue in an operator and many times such non-vigilance leads to accidents. Therefore early detection of fatigued state has become essential in monotonous working environments like driving vehicle, operating machines etc. Such fatigued state often gets developed gradually and can be identified by certain symptoms. Differen...

Abstract: Introduction: Research has shown that many pregnant women in Iran do not exercise during pregnancy. However, exercise, especially endurance exercise during pregnancy, is associated with good maternal and fetal outcomes. Objective: The study aimed to examine the effect of squat exercises on fatigue and the life quality of pregnant women admitted to health centers in Hamadan City, Ira...

conclusions the present study showed the beneficial effects of nutritional training on fatigue and adl in patients with ms. therefore, nurses and dietitians should regularly assess the patients’ dietary pattern and train them and their families about appropriate diet. methods this quasi-experimental one group, pretest and posttest study was performed on 40 patients with ms, who were convenientl...

conclusions office workers with chronic hepatitis c, treated with pegylated-interferon-α2b plus ribavirin, had work performance loss. in subjects treated with acetyl-l-carnitine supplementation we observed increased daily activity and reduced presenteeism and fatigue. acetyl-l-carnitinegroup had a smaller reduction of productivity comparing to placebo group. results significant difference were ...