Rolling Contact Fatigue (RCF) is the result of crack initiation and propagation leading to surface damages. This study proposes a mesoscopic model for RCF simulation. Finite Element Method (FEM) used obtain stresses using cubic elasticity. Persistent Slip Bands (PSBs) are modeled polycrystalline geometry grain orientations. PSBs can pass through Grain Boundaries (GBs) if misorientation adjacent...

Increasing use of aluminum shape castings in automotive and aerospace industries has drawn great attention to fatigue properties of cast aluminum components. The fatigue resistance of aluminum castings strongly depends upon the presence of casting flaws and characteristics of microstructural constituents. The existence of casting flaws significantly reduces fatigue crack initiation life. In the...

A micromechanical model is developed for grain bridging in monolithic ceramics. Specifically, bridge formation of a single, non-equiaxed grain spanning adjacent grains is addressed. A cohesive zone framework enables crack initiation and propagation along grain boundaries. The evolution of the bridge is investigated through a variance in both grain angle and aspect ratio. We propose that the bri...

The strength deterioration and fracture tendency of freeze-thaw rock determine the construction operation safety engineering. This article conducted compression-shear composite load tests on sandstones with various saturations to examine failure law rocks in cold climates contributing elements degradation. It was found that an increase saturation loading angle, compressive elastic modulus dropp...

In this work, the effects of loading condition and corrosion solution on the corrosion fatigue behavior of smooth steel wire were discussed. The results of polarization curves and weight loss curves showed that the corrosion of steel wire in acid solution was more severe than that in neutral and alkaline solutions. With the extension of immersion time in acid solution, the cathodic reaction of ...

A cell structure development and a crack initiation during fatigue of an Fe-3 mass%Si alloy was investigated through electron channeling contrast imaging in scanning microscope back-scatter diffraction analysis. The crystal rotation regions (CRRs), deformation bands (DBs), (CBs) together formed hierarchy the dislocation structures. In early stage fatigue, is constrained near grain boundaries; t...

The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces. To reveal the influence beddings on anisotropic characteristics under impact, Brazilian splitting tests were conducted split Hopkinson pressure bar system. fracturing process monitored high-speed camera. Meanwhile, to understand crack initiation propagation mechanism, stress buildup, shadow transfer...

The fundamentals associated with acoustic emission monitoring of fatigue crack initiation and propagation of Ti-6AI-4V were studied. Acoustic emission can detect and locate incipient fatigue crack extensions of approximately 1 0 gm. The technique therefore can serve as a sensitive warning to material failure. There are three distinct stages during which acoustic emission is generated. These sta...

In dentistry, many preparation guidelines for allceramic crowns are still based upon clinical experience and those developed for metal ceramic crowns that may not be applicable and need further experimental and numerical evaluation. Some specific features are requiring investigation in dental prosthetic devices, for example, configurations of the crowns’ margin [1], marginal thickness [2, 3] an...