Studies on Impact Fatigue : Part 1, Impact Fatigue Testing Machine and Impact Fatigue on Mild Steel

Impact Fatigue Behaviour of Flapper Valve Steel

The purpose of this study is to discuss the impact fatigue failure mechanism of a suction valve that involves the fracture with fragments torn off from the edge or surface. The shape and dimensions of the test specimen and stopper were made the same as those of the suction valve and stopper in an actual compressor. The specimen was operated by short-duration compressed air pulses, and struck ag...

The Metallography of Impact Fatigue

Fatigue impact scale demonstrates greater fatigue in younger stroke survivors.

BACKGROUND Fatigue affects 33-77% of stroke survivors. There is no consensus concerning risk factors for fatigue post-stroke, perhaps reflecting the multifaceted nature of fatigue. We characterized post-stroke fatigue using the Fatigue Impact Scale (FIS), a validated questionnaire capturing physical, cognitive, and psychosocial aspects of fatigue. METHODS The Stroke Outcomes Study (SOS) prosp...

Impact of cancer-related fatigue on the lives of patients: new findings from the Fatigue Coalition.

PURPOSE This survey was designed to confirm the prevalence and duration of fatigue in the cancer population and to assess its physical, mental, social, and economic impacts on the lives of patients and caregivers. Patients and Methods. A 25-minute telephone interview was completed with 379 cancer patients having a prior history of chemotherapy. Patients were recruited from a sample of 6, 125 ho...

Enhancing Fatigue Strength by Ultrasonic Impact Treatment

Enhancement in fatigue performance of welded joints by Ultrasonic Impact Treatment (UIT) was evaluated in large-scale specimens having a nominal yield strength of 345 to 690 MPa. Eighteen rolled-beam specimens having welded details at cover plates and transverse stiffeners and eight built-up specimens having only transverse stiffener details were fatigue tested after treating them by UIT. A par...