Failure analysis of pin-loaded aluminum-glass-epoxy sandwich composite plates

The aim of this study is to investigate failure load and failure mode in an aluminum-glass-epoxy sandwich composite plate, with a circular hole, which is subjected to a traction force by a pin. To evaluate the effects of joint geometry and fiber orientation on the failure strength and failure mode, parametric studies were performed experimentally. The end distance to diameter (E/D), and width to diameter (W/D) ratios in the plate were changed from 1 to 5 and 2 to 5, respectively. Experimental results show that the first failure load and ultimate failure load increase by increasing E/D and W/D ratios, and when these ratios are equal or greater than 4, full bearing strength occurs. (C) 2002 Elsevier Science Ltd. All rights reserved

Solution Combustion Synthesis Of Iron Oxyborate (Fe3Bo6)

In this study, iron oxyborate (Fe3BO6 was synthesized through the solution combustion method as a potential anode material for lithium-ion batteries. Urea, glycine, citric acid, carbohydrazide, hexamethylene tetramine, and starch were used as fuel sources and the effects of the fuels were investigated. The obtained materials were structurally characterized by FT-IR, powder-XRD, solid UV-Vis, TGA and VSM. The pure crystalline Fe3BO6 was synthesized at low temperature and short reaction time using glycine-assisted solution combustion method. It was thermally stable up to 945 °C with a non-uniform morphology and a highly porous structure. The magnetic properties were also studied and Fe3BO6 shows antiferromagnetic behavior. © 2019, Turkish Chemical Society. All rights reserved.Scopu

Synthetic routes to manganese oxoborate and correlations between experimental parameters and properties

This study examines manganese oxoborate synthesis in three different routes and the role of process parameters on structure and morphology of the products. Borax or boric acid and simple manganese salts were used as raw materials. In this regard, the samples prepared by hydrothermal, solid-state, and solution combustion methods were characterized by powder X-ray diffraction (XRD), vibrational spectroscopy (FT-IR and Raman), thermal analysis (DSC and TGA), scanning and transmission electron microscopy (SEM and TEM), chemical analysis and BET surface area measurements. It was found that all three strategies yielded warwickite-type Mn2OBO3 nanoparticles, but with significant changes in morphology, size, and surface characteristics. The hydrothermal approach has proven to be a general approach for synthesizing manganese oxoborate nanorods at pH 7.5. Solution combustion technique appeared the most practical and promising not only as a time-saving route but also in the production of ca. 100 nm, quasi-spherical, mesoporous manganese oxoborate nanoparticles