COMPUTATIONALMODELING of mechanical behavior during solidification is becoming more important. Thermal and microstructural simulations alone are insufficient to predict the quality of the final product that is desired by the casting industry. Accurate calculation of displacements, strains, and stresses during the casting process is needed to predict residual stress and distortion and defects su...

Polyester gelcoat has been a useful and popular coating for RP fabrication for over twenty years. The gelcoat has not only been important as a protective coating for the fiberglass laminate in a large variety of construction applications, but in many cases has provided a cosmetically desirable finish that enhances the attractiveness and market value of the RP part. In recent years as the manufa...

a r t i c l e i n f o Managers construct organizational façades that mislead external stakeholders, organizational members, auditors, researchers, other managers, and even themselves (Nystrom & Starbuck, 1984). Very little empirical research has been conducted on how managers build these façades since Nystrom & Starbuck's first influential article. This paper reports on the creation of an organ...

Recent advances in non-contact strain measurement techniques and large-strain constitutive modeling of the Linear Low-Density Polyethylene film used in NASA Superpressure balloons, StratoFilm 420, are combined to provide a novel measurement technique for the tear propagation critical value of the J-integral. Previously these measurements have required complex test configurations and procedures....

Abstract The aluminum alloys belonging to the 7000 series are high-strength used in a wide variety of products for weight reduction. They primarily field transportation and aerospace. Among these, A7075 alloy has highest strength is expected be applicable range fields, such as aircraft components sports equipment. However, it high deformation resistance prone surface defects, which called teari...

The influence of certain equilibrium flows on the stability of tearing modes in the reversed-field pinch is investigated. By solving the linearized magnetohydrodynamic equations in cylindrical geometry, the tearing mode stability factor ′ is calculated for a variety of axial flow profiles which have nonzero shear away from the rational surface, including flows localized entirely in the external...

The basic weldability of the alloy Al-2.2Li-2.7Cu was investigated and compared with two common aluminum alloys: 2024 and 5083. The basic weldability was characterized by the susceptibility of the alloy to hot tearing as determined by the trans-Varestraint test. The hot tearing susceptibility was characterized through plots of total crack length and maximum crack length versus augmented strain....

Observations from the Earth’s geomagnetic tail have established that the current sheet is often bifurcated with two peaks in the current density. These so-called bifurcated current sheets have also been reported in a variety of simulations and often occur in conjunction with significant temperature anisotropy. In this work, a new self-consistent Vlasov equilibrium is developed that permits both...

The use of biting to obtain food items attached to the substratum is an ecologically widespread and important mode of feeding among aquatic vertebrates, which rarely has been studied. We did the first evolutionary analyses of morphology and motion kinematics of the feeding apparatus in Indo-Pacific members of an iconic family of biters, the marine angelfishes (f. Pomacanthidae). We found clear ...

PURPOSE To investigate the interaction between corneal stimuli at different positions and tear secretion and to establish relationships between nociceptive stimuli detection thresholds and stimulated tearing. METHODS Using a computerized Belmonte-esthesiometer, mechanical and chemical stimuli, from 0% to 200% of the threshold in 50% steps, were delivered (in random order) to the central and p...