Fatigue and fracture mechanisms have been studied in a steel-based metal matrix composite (MMC), comprising a 316L austenitic matrix reinforced with 25 wt% particulate titanium diboride (TiB2). The fracture toughness was determined in the as-HIPped condition as being slightly below 30 MPa√m. Fatigue crack growth rates have been determined, and corrected for the effects of crack closure. The fra...

Based on CT experiments of the mechanical behavior a certain sandstone, safety zone, damaging and fracture zone geotechnical materials were defined, threshold standard this was discussed empirically selected. Mathematical morphological image measurement technology used to analyze information each section, variation law sandstone number with loading process conditions studied. According statisti...

We study the crackling noise emerging during single crack propagation in a specimen under three-point bending conditions. Computer simulations are carried out in the framework of a discrete element model where the specimen is discretized in terms of convex polygons and cohesive elements are represented by beams. Computer simulations revealed that fracture proceeds in bursts whose size and waiti...

This paper presents the application of three main Artificial Neural Networks (ANNs) in damage detection of steel bridges. This method has the ability to indicate damage in structural elements due to a localized change of stiffness called damage zone. The changes in structural response is used to identify the states of structural damage. To circumvent the difficulty arising from the non-linear n...

The interface between concrete and steel in reinforced concrete governs the interaction between the two types of materials under loading. When the interface is seriously damaged, such that a macro-crack is formed, de-bonding takes place or large slip occurs, and the load-transferring capacity of the interface will drop dramatically. In this study, a vibration-based method is presented to detect...

PURPOSE To present a case of tamoxifen retinopathy on a 57-year-old woman. DESIGN An observational case. METHODS A review of history, clinical examination, and findings on Spectral-domain Optical Coherence Tomography (SD-OCT), fluorescein angiogram (FA) and electro-oculogram (EOG) was conducted. RESULTS A 57-year old female patient, who had been treated with oral tamoxifen after mastectom...

Unlike for the instrument of hazard zone maps for surface waters, there is no common approach for the calculation of inundation risk caused by spontaneous overland runoff. For being able to assess the associated potential damage, the maximum inundation depth is being calculated via an extended 2D flow model, based on a rain event with an 100-year return period and a duration of 60 minutes. The ...

The sandstone yield strength and tensile were increased under cyclic loading paths by using the Brazilian splitting method. experiment shows that (1) specimens exhibit multiple penetrating crack damage loading, while slightly increases; (2) horizontal strain (Exx) concentration area decreases, shear (Exy) increases form changes from completely brittle to ductile mixed tensile-shear damage; (3) ...

Oxidative brain damage, such as excitotoxicity and stroke, leads to primary neuronal destruction. The primary damage is further potentiated by macrophages and microglial cells, which are attracted and invade into the zone of damage resulting in secondary neuronal death. Since the essential trace element selenium has anti-inflammatory properties, we analyzed the effects of selenium on these infl...