The paper aims to offer the readers knowledge and information, to support new implementation and use of the SLM technology for practical applications and to obtain good metal parts for end users. The SLM parameters and conditions were evaluated to set up a scale and estimate how reliable the SLM-AM process is, on a particular type of machine. The experimental research was carried out in the last years by the authors, using the Realizer 250 machine. Many times, there is a lack of repeatability and reliability of the SLM process. The paper is presenting a new method to evaluate the repeatability and the surface roughness, when processing four types of powder materials, mainly for medical applications. Specimens were manufactured from four materials considered as being bio-metals: pure Titanium, Ti6Al7Nb, CoCr, and CoCrWMo. All these important features of the SLM parts were for seen by the authors in close relation with the mechanical characteristics of the parts. In this way, a good instrument is offered for further FEA applications, such as static and dynamic analysis. The main achievement of this paper is our proposed methodology, useful for a new user to design and analyse a specific practical SLM part. In this way, it will be possible for sure to manufacture that part by SLM, using the Realizer 250 machine, from one of the four types of materials, that the authors are presenting detailed data regarding their physical-mechanical properties.
Attic floors are a favoured solution in refurbishing/rehabilitating residential buildings as well as for new buildings in Romania, under the conditions of climate changes and especially for adapting to the global warming phenomenon. Optimizing the thermal protection during the hot season can be made by a layer of ventilated air disposed directly under the roof covering. In order to analyse the ventilation process, and to establish design recommendations the authors have used a physical small scale model, in laboratory conditions, according the Grashof criterion. The paper is presenting a profitable utilization of similitude conditions leading to opportunities of analysing the indoor ventilation in passive system for a better energy efficiency.
Anpassung des Gebäudebestandes an Klimaveränderungen. Der Dachgeschossausbau ist eine Standardlösung bei der Instandsetzung von Wohngebäuden und im Neubau in
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.