This study introduces a new type of precast, prestressed reactive powder concrete (RPC) bottom panel for a large-span composite slab. The bottom panels, which have one or two inverted ribs with openings, act as formwork during the construction stage. The paper experimentally investigated the crack characteristics, deflection, and normal section bearing capacity of four precast, prestressed ribb...

Micromechanical models for fracture initiation that incorporate local failure criteria have been widely developed for metallic and ceramic materials; however, few such micromechanical models have been developed for the fracture of bone. In fact, although the fracture event in "hard" mineralized tissues such as bone is commonly believed to be locally strain-controlled, only recently has there be...

Abstract With the help of fractional differential equations, this article studies failure morphology, fatigue strength, and life corroded reinforced concrete beams under loading. Studies have shown that mid-span deflection low-corrosion is smaller than uncorroded beams. The corrosion-fatigue coupling effect accelerates crack growth rate steel bars. This reduces modulus causes stiffness beam to ...

Glass–ceramic filler particles containing various amounts of fluoroapatite–mullite crystalline phases were synthesised using SiO2–Al2O3–P2O5–CaF2–CaO system as the base glass formulation. Different additives were used to promote crystallisation in this system. Composite samples were prepared by incorporating the silane treated glass–ceramic particles into the BisGMA/TEGDMA (60 : 40 mass ratio) ...

Graphene-based organic light-emitting diodes (OLEDs) have recently emerged as a key element essential in next-generation displays and lighting, mainly due to their promise for highly flexible light sources. However, their efficiency has been, at best, similar to that of conventional, indium tin oxide-based counterparts. We here propose an ideal electrode structure based on a synergetic interpla...

The Acoustic Emission (AE) and Dynamic Identification (DI) techniques were applied simultaneously, in an original way, to examine the stress dependent damage progress in pre-notched concrete beams tested in four-point bending. The damage mechanisms were characterized by analyzing the AE signals registered during the tests, conducted by increasing the specimen’s vertical deflection. In particula...

• An automatic fatigue crack growth algorithm was used to evaluate the influence of in-phase and out-of-phase loadings in FCG. In-phase lead deflection under a 0.5 biaxial load ratio due mixed mode loading conditions. Fatigue life is proportional initial notch angle but inversely phase shift. Crack propagation direction influenced by combination static cyclic on different axes. Different freque...

Two problems of technological importance for microelectromechanical systems ~MEMS! and microelectronics industry are addressed: fatigue of thin films and nanoscale film cracking. A device is described that can ~1! conduct biaxial fatigue tests on thin films and ~2! be utilized to study fracture patterns in nanoscale coatings under biaxial stress state. Thin-film specimens, in the form of circul...

The flexural behaviour of concrete containing Foamed glass as partial replacement of coarse aggregate is investigated. The coarse aggregate was replaced with 0%, 25%, 50%, 75% and 100% Foamed glass. All other constituents were maintained the same. Reinforced concrete beams were cast using 2 bars of 8mm in diameter in the tensile zone. The density and compressive strength of concrete decreased a...

The repairing technology based on laser rapid fusion is becoming an important tool for fixing grey cast iron equipment efficiently. A laser repairing protocol was developed using Fe-based alloy powders as material. The microstructure and fracturing feature of the repaired zone (RZ) were analyzed. The results showed that regionally organized RZ with good density and reliable metallurgical bond c...