The second-generation aluminum-magnesium-scandium (Al-Mg-Sc) alloy, which is often referred to as Scalmalloy®, has been developed as a high-strength aluminum alloy for selective laser melting (SLM). The high-cooling rates of melt pools during SLM establishes the thermodynamic conditions for a fine-grained crack-free aluminum structure saturated with fine precipitates of the ceramic phase Al₃-Sc...

As part of the "Fatigue and Performance Modeling Workshop," six modeling teams made predictions for temporal profiles of fatigue and performance in five different scenarios. One scenario was based on a laboratory study of fatigue and performance during 88 h of extended wakefulness with or without nap opportunities. Another scenario was based on a field study of alertness in freight locomotive e...

DOD SBIR Phase II Company Name Title Quad Chart NTTC Taxonomy TEXAS RESEARCH INSTITUTE AUSTIN, INC. 9063 Bee Caves Road Austin, TX 78733-6201 Advanced Prognostic Health Management Technologies Using Integrated Detection Techniques with Physics of Failure Mode The proportion of fatigue life that is expended during fatigue crack nucleation is significant in the materials and loading typical of ai...

This paper presents the results of a combined experimental and theoretical study of the fatigue crack initiation in LIGA Ni thin films with a thickness of 270 mm. The potential roles of surface oxide thickening and slip bands are explored for fatigue crack initiation. Surface oxides and roughness are characterized using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). T...

EMG-assisted biomechanical modeling is a well-established modeling technique for estimating muscle forces in biomechanical models of the lumbar spine. Fatigue, however, creates a problem in that fatigue alters the relationship between the EMG signal generated by the muscle and the amount of force being generated. The aim of this study was to evaluate the impact of fatigue on EMG-related compone...