In conventional crown structure, the crowns are bonded to the bottom layer with a cement layer. The major clinical failure mode is the subsurface radial crack at the interface between the crown and cement. This failure is caused largely by the tensile stress concentration/singularity in the dental ceramic at that interface. A sharp change in the structure geometry or/and mismatch in material properties at interfacial boundary is the source for such stress concentration/singularity.
Fiber-reinforced polymer composites (FRPC) have long been recognized for their high strength-to-mass and stiffness-to-mass ratios and excellent corrosion resistance. Certain emerging technologies in the oil and gas industry do not permit the use of metallic structures, and FRPC are therefore considered as an alternative. Conventional polymer materials are usually not capable of sustaining the environmental conditions that exist for the considered applications, which includes temperatures in excess of the boiling point of water, and exposure to hydrocarbons and water.
The Wind Engineering, Energy and Environment (WindEEE) Dome, the world’s first hexagonal wind tunnel, represents a technological breakthrough in the study of wind-related phenomena as it has the capability of physically simulating high intensity wind systems – including tornados, downbursts, gust fronts or low-level nocturnal currents – that cannot be created in any of the existing wind tunnels.