Flow around cylinders is widespread in marine engineering projects such as risers, pipelines, and tension leg. To understand the wake characteristics of circular cylinder with different roughness, at a Reynolds number 7400, circulation water tunnel used for experimental PIV measurements to compare among smooth cylinder, original grooved secondary cylinder. The results revealed that reduced reci...

The aim of this study was to analyze the microhardness of two resin-modified glass ionomer cements (Vitremer; Fuji II LC); two polyacid-modified composite resins (Freedom; F2000) and a hybrid composite resin (Prodigy), at different depths from the upper surface. Six hemi-cylinders (3 mm height; 3 mm radius) per tested material were obtained. Vickers Hardness was determined using a micro-indenta...

Kevlar is a type of aramid fibers which is characterized by high strength to low weight ratio. This material is widely used in bulletproof vests and helmets, in which it creates a barrier to projectiles to protect specific objectives, laminated tubes and pressure vessels, etc. In this study the ballistic behavior of Kevlar /epoxy composite and Kevlar fabric is investigated. The results showed t...

Abstract Folded surfaces of origami tessellations have attracted much attention because they often exhibit nontrivial behaviors. It is known that cylindrical folded waterbomb tessellation called tube can transform into peculiar wave-like surfaces, but the theoretical reason why arise has been unclear. In this paper, we provide a kinematic model by parameterizing geometry module and derive recur...