In probabilistic design of materials for fracture-critical components in modern military turbine engines, a typical maximum design target risk (DTR) is 5 10 8 component failures/engine flight hour. This metric underscores the essential role of safety in a design process that simultaneously strives to achieve performance, efficiency, reliability, and affordability throughout the life cycle of th...

objectives: the purpose of this study was to evaluate the resistance to fatigue failure of five different nickel-titanium rotary files in three different curved trajectories. materials and methods: a total of 150 neoniti a1, race 25.06, mtwo 25.06, twisted file 25.06 and protaper next x2 files with the tip size of 25 were tested (n=30 for each group). three groove types simulating curved canals...

conclusions general fatigue and its subscales had a significant relationship with workplace physical trauma among miners. workplace physical trauma can be reduced by managing fatigue with different programs, including decreasing the workload, scheduling rest breaks at the facilities, and possibly providing welfare and entertainment opportunities for the workers. background fatigue may lead to o...

The authors have re-examined the Strength-Life Equal Rank Assumption (SLERA) that is used in the fatigue life prediction of composite materials, and suggest that this assumption may be valid for a wide range of fibre-reinforced epoxy laminates subjected to tensile, compressive or shear fatigue Ioadings. The evidence presented here suggests that there may be an exact correlation between the init...

abstract aim and background: multiple sclerosis is a chronic neurological disorder which is more prevalent in women than men. therefore, the aim of present study was to evaluate the relationship physical functioning impairment (as criterion variable) with fatigue, psychological symptoms and body mass index (as predictive variables) in the women suffering from this disease. methods and materials...

Hot forging is a common manufacturing process for the production of large quantities of engineering components. Residual stresses are developed in forged components as a result of various aspects of the manufacturing process, including subsequent cooling, and heat treatment. Residual stresses can significantly affect the deformation and fatigue failure of materials. Hot forged EN15R steel bars ...