Key Engineering Materials Vol. 843

Abstract: Soil settlement is normally quantified using conventional soil volume change models which are solely based on the effective stress and the role of shear strength is ignored due to the difficulties to incorporate in the framework. The Rotational Multiple Yield Surface Framework (RMYSF) is a soil volume change model developed from the standpoint of the interaction between the effective stress and shear strength. RMYSF incorporates the development of mobilised shear strength within the body of the soil whenever the soil is subjected to anisotropic compression. Currently the framework has been applied to predict the soil anisotropic stress-strain behaviour at any effective stress. This paper present the enhancement of this volume change framework using normalisation of axial strain with the understanding that the failure axial strain is not unique, but increases as the effective stress increases. This technique has essentially produced a better accuracy in the prediction of the stress-strain response for Malaysian residual soils. A series of drained tri-axial tests under various effective stresses has been conducted using specimens of 50mm diameter and 100mm height and from the stress-strain curves the inherent mobilised shear strength envelopes at various axial strains have been determined. These mobilised shear strength envelopes were then applied for the prediction of the soil stress-strain response. An excellent agreement between the predicted and the actual stress-strain curves has been achieved.

Abstract: Due to the increasing of the price of different materials and resource saving it is very promising to develop technology of creation cheap coatings with specified properties. We developed a diffusion-doped powder based on austenitic steels for producing plasma-sprayed coatings. In comparison with Ni-based powders our materials have better adhesion, they are cheaper, they have better mechanical machinability, it is possible to produce coatings with required properties. In our work, the features of diffusion doping of microparticles of powder, the behavior of the powder in the plasma jet were studied. The significant decreasing of porosity, increasing of adhesion of the plasma-sprayed coatings after laser processing were marked. The substantial increase of wear-resistance in 2,5-3,0 times in comparison with untreated coatings when working in conditions of abrasive wear and atmospheric precipitation was revealed.

Abstract: Zinc plating using the principle of sacrificial anode is used to prevent steel corrosion. Pure zinc plating has some problems and Zn-Mn alloy plating has been studied as one of the measures to increase the corrosion resistance. Zn-Mn alloy plating can be applied to automotive parts requiring high corrosion resistance despite high plating cost. In this study, Zn-Mn alloy plating was electrodeposited in acidic chloride solution. The effects of electrolytic conditions on the composition of the alloy plating in the chloride bath were investigated. As the current density increased, the Zn content decreased and the Mn content increased. As the temperature of the electrolyte increased, the Zn content decreased and the Mn content increased.

Abstract: Operationally ready is a key component to effective management of equipment, spares and systems through manufacturing, shipment and transport, meaning that products are impacted by how they stored, shipped and staged. That means no rust, no degradation and the ability to utilize the equipment or parts quickly, with no cleaning or additional work required. Significant advancements have been made in oil free, volatile free anti-corrosion protection to aid this. These advancements are in the form of plastics, laminates, canvas, woven products and shrink films that can be used to provide long term stable packaging that can be used both as short term, one-time use, multiple use applications or even used to create portable storage shelters. These materials will also help stabilize and help protect metals as well as non-metallic components and materials such as items that can swell, gaskets, fabric and rubber components, against degradation – this is critical since many systems are combination of materials, no longer just single material construction. These developments in oil free, volatile free packaging have been successfully incorporated into automotive applications with short term and long-term protection being available from the same packaging. Additionally, information on accelerated testing on already environmentally stressed items will be reviewed and solutions presented to their protection schemes as well.

Abstract: Bundles or fabrics of sized glass fibres were treated by a dielectric barrier discharge plasma in a He/CF₄ gas mixture at atmospheric pressure with and without ultrasonic irradiation. The plasma treatment introduced fluorine both inside and outside of the fibre bundle, decreasing wetting of glycerol. Ultrasonic irradiation markedly increased the fluorine content as well as the silicon, calcium, and aluminium contents, indicating simultaneous fluorination and preferential etching of organic components. It is indicated that plasma treatment in a He/CF₄ gas mixture can be used for controlling the surface properties of glass fibre bundles, and that ultrasonic irradiation can enhance functionalization and etching.