Fiber reinforced polymers, for example sheet molding compounds (SMC), have gained significant importance as lightweight materials. In this work, a SMC composite based on unsaturated polyester-polyurethane hybrid resin (UPPH) with discontinuous long glass fibers is considered. The mechanical behavior of highly governed by its microstructure. Based samples extracted from compression molded sheets...

The aim of this study was to investigate the thickness of mouthguard sheet after vacuum-pressure formation based on the mouthguard sheet material. Three mouthguard sheet materials (4.0 mm thick) were compared: ethylene-vinyl acetate co-polymer (EVA), olefin co-polymer (OL), and polyolefin-polystyrene co-polymer (OS). The working model was made by hard gypsum that was trimmed to the height of 20...

The aim of this study was to investigate vacuum forming techniques for reduction of loss in mouthguard thickness effects of sheet grooving and thermal shrinkage of extruded sheets on molded mouthguard thickness. Mouthguards were fabricated with ethylene vinyl acetate (EVA) sheets (4.0 mm thick) using a vacuum forming machine. Sheet form was a convexing v-shaped groove toward the back, 10-40 mm ...

We demonstrated a 51 cm long waveguide array on a poly(methyl methacrylate) sheet fabricated by silicon hard-molding technology. To reduce the silicon sidewall roughness, a wet-oxidation followed by a buffered oxidation etchant etching process is adopted, achieving a surface roughness of 1.2 nm. The waveguide obtained a total insertion loss of -15.1 dB and an adjacent channel cross talk below -...

Sheet Molding Compound (SMC) materials offer attractive specific strength and stiffness properties. With an addition of short cycle times, the possibility for complex geometries a high recycling potential, this material is promising solution manufacture lightweight components numerous industrial sectors. Accurate reliable simulation can contribute to fast competitive development process effecti...

Conventional methods used to fabricate the light guide plates (LGPs), such as injection molding and hot embossing, are difficult and unsuitable. In this study, the authors propose a new manufacturing process for the roll-to-plate UV imprint lithography (RPIL) technique that fabricates LGPs with dot patterns. A flexible and transparent sheet mold with microstructures required by the RPIL machine...