Metals with nanoscale twins have shown ultrahigh strength and excellent ductility, attributed to the role of twin boundaries (TBs) as strong barriers for the motion of lattice dislocations. Though observed in both experiments and simulations, the barrier effect of TBs is rarely studied quantitatively. Here, with atomistic simulations and continuum based anisotropic bicrystal models, we find tha...

Flow of a polymer in an intermeshing co-rotating twin-screw extruder is simulated. Effect of elongational viscosity on the flow is analyzed using independent powerlaw models for the shear and elongational viscosities. Axial component of the velocity is found to be maximum in the intermeshing region of the extruder. Axial component of velocity, which determines the throughput of the extruder, de...

Purpose. Anterior screw fixation has become a popular surgical treatment method for instable odontoid fractures. Screw loosening and migration are a rare, severe complication following anterior odontoid fixation, which can lead to esophagus perforation and requires revision operation. Methods. We report a case of screw loosening and migration after anterior odontoid fixation, which perforated t...

Thermal stability is of major importance in polymer extrusion, where product quality is dependent upon the level of melt homogeneity achieved by the extruder screw. Extrusion is an energy intensive process and optimisation of process energy usage while maintaining melt stability is necessary in order to produce good quality product at low unit cost. Optimisation of process energy usage is timel...

A Pareto Local Search (PLS) algorithm was developed and applied to the screw configuration of co-rotating twin-screw extruders. This problem can be seen as a sequencing problem where a set of different screw elements are to be sequentially positioned along the screw in order to maximize the extruder performance. The results obtained were compared with previous results obtained with a Multi-Obje...

In a manner of addressing challenges in scalable processing thermoplastic polyurethane (TPU) nanocomposites through extrusion methods, this study reports very clean approach incorporating cellulose nanocrystal (CNC) into TPU matrix, with no acid or organic-solvents usage. It involves mechanical deconstruction microcrystalline (MCC) nanoscale particles water and polyol bead-milling, vacuum dryin...

Due to its high crystallinity, tailored compostability, and superior barrier performance, poly(glycolic acid) (PGA) has great potential as a substitute for current single-use plastics used in food packaging applications with lower carbon footprint. However, susceptibility hydrolysis mechanical brittleness hinders direct suitability packaging. In this work, we circumvent limitation by first blen...

Renneted casein gels, often named cheese curds, are traditionally pre-heated by immersion in water before stretching, which influences functional properties. This work aims to understand the effect of pre-heating (cooking) on extrusion process curds at 80 and 90 °C a lab twin-screw, co-rotating extruder, consequences for composition, microstructure properties extrudates. The cooking significant...

The screw compressor in the early stage of development is generally known as the oil-injection type. However, escalating environmental problems and advances in electronic components have spurred continuous R & D to minimize the oil content in compressed air. The oil-free twin-screw compressor is continuously compressed by inner volumetric change between rotors and casing. Fo this reason, in ord...

Twin screw wet granulation (TSG) is gaining more attention and becoming an important process in the pharmaceutical industry. The process is widely implemented because of its flexibility, short residence time, and small equipment footprint. Past studies have shown that screw elements can have a significant impact on the performance of the TSG process. In addition, these studies identified that b...