Papers by Author: Milagros M. Huerta

Abstract: A research paper should generate new questions and is cyclical in nature, where answers to research questions of today will be the base for the research questions of tomorrow [. To facilitate this work, we propose a holistic approach to information search, in addition to an overview and orderly search process to determine the state of the art, it helps the investigator under any circumstances, to find new lines of work or tendencies in any subject under analysis.

Abstract: Climate change and increasing energy prices threaten the planet and the economy. The European Union has promised to take the lead, through a reduction in greenhouse gases by 20 to 30% and a 20% energy savings by 2020. In this context, the EU is about to ban some of the most inefficient lightbulbs for everyday. Lighting would set the limit at the level of CFLs/LEDs (most energy efficient existing lamps). The energy savings would be maximized, the target is 86 TWh of electricity saved per year in the EU by 2020. To discover how to use different materials in this technology is a high-priority as it shows the advance; maybe this is the future of lighting.

Abstract: A part of this work takes place in a collaborative environment among students which have different knowledge and skills, and the rest is carried out in traditional classrooms to steer students towards the most appropriate solution. To obtain the best results it is necessary to apply the principles of respect for the environment where being more effective. This takes place in the design criteria and bases, especially to minimize the problem at source, recovery of materials, use of new materials, life cycles of products, etc.. (sustainability and respect for the environment). European universities are currently undergoing a convergence process to build and promote the European Higher Education Area and the guidelines for this process are being followed in our area. This teaching method focuses on the need to educate people so that they are capable of learning to learn and can continue to learn throughout their lifetimes.

Abstract: Titanium based alloys, mainly UNS R56400 (Ti6Al4V), are increasingly being applied in the airship building industry due to its excellent physicochemical properties. Machining operations are usually required in the manufacturing processes of Ti based aerospace structural elements. However, high reactivity of Ti provokes a quick tool wear. So, in order to reach an economically acceptable production level, it is necessary to minimize the costs associated to tool wear. In this work, Scanning Electron Microscopy (SEM), Stereoscopic Optical Microscopy (SOM) and Energy Dispersive Spectroscopy (EDS) have been used for both analysing and identifying secondary adhesion mechanisms that are taking place when an aeronautical titanium alloy is machined. Special severe cutting conditions have been applied. Thus, titanium alloy have been dry machined with TiN coated WC-Co tools. Results obtained have shown that tool wear is controlled by a secondary adhesion mechanism, which presents two stages. A first stage is constituted by a TiOx multi-film formed onto the tool surfaces. A second step involves the mechanical adhesion of the alloy material to those surfaces. When this material is removed, tool particles are dragged off causing tool wear.