Adrian Popescu
Technical University of Cluj-Napoca
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Publication
Featured researches published by Adrian Popescu.
Applied Mechanics and Materials | 2013
Adrian Popescu; Liana Hancu; Paul Bere
Polymeric materials extrusion is a very complex manufacturing process opened for new research. In this paper the authors use for extrusion polyamide 6.6 reinforced with 20% glass fibres. This material offers very good mechanical, thermal and frictional proprieties. The improvement of these proprieties can be realized through the optimization of the extrusion process. Temperature is a very important parameter for obtaining good quality products, so to choose the proper values of it, is an interesting challenge. It was proved that the main influence upon the products quality have the temperatures from the metering zone and from the forming zone so the optimization of these is of maximum importance for the quality of the products. The Response Surface Method (RSM), based on ANOVA - Analysis of Variance model was used for optimization the temperatures from the metering zone and from the forming zone.
Applied Mechanics and Materials | 2015
Cristina Ștefana Miron-Borzan; Alina Popan; Vasile Adrian Ceclan; Adrian Popescu; Petru Berce
This paper presents the basic principle for achieving a custom implant from biocompatible materials with the human body using Additive Manufacturing technologies. Due the fact that is a new product which will be introduced on the market, a marketing study was needed. This study presents also the mathematical, analytical and graphical modeling of the psychological price, for a custom implant type cranioplasty / hip prosthesis / spinal implant. The assessment of psychological price for a custom cranioplasty implant, that is not the object through curative Romanian health programs, bring relevant information on the knowledge of maximum and minimum limits that the purchasers, potential consumers, are willing to accept, so the price at which the proportion of consumers potential is the greatest.
Applied Mechanics and Materials | 2015
Adrian Popescu; Liana Hancu; Paul Bere; Cristina Ștefana Miron-Borzan
This paper presents the possibility of extrusion optimization using Design Expert software for statistical analyze and also for the recommendation of some manufacturing data. Mechanical characteristics are determined on samples from extruded tubes. On these samples, ANOVA (Analysis of variance) software is used, in order to determine the optimal values of the temperatures in different zones. The material is polyamide 6.6, reinforced with 10 % glass fiber (PA 6.6 – 10 % GF). The authors want to present the influence of the reinforcement degree upon some mechanical characteristics of the products made by extrusion. Considering the homogeneity of the polymeric melt the product’s quality will be analyzed. During the extrusion process a series of parameters (extrusion speed, the pellets feed, processing temperature etc.) are involved and they must be taken into account to achieve calibrated and qualitative products.
Applied Mechanics and Materials | 2015
Liana Hancu; Horatiu Iancau; Paul Bere; Adrian Popescu
The main goal of the research is to find new recipe for composite based melamine, in order to obtain less toxic products. In the paper there are presented the equipment and the experiments made by the authors in order to obtain samples from a composite material made from melamine and different ratio of chalk. A compression test was performed and the results were graphically presented. A mathematical approach was realised and the results are presented.
Applied Mechanics and Materials | 2015
Paul Bere; Adrian Popescu; Liana Hancu
The fiber-reinforced polymer composites are of great scientific and technical interest and a very impressive development. This justifies both the development of the research in this area, and the extension of the production of such materials.This paper presents research regarding three different composite materials, plates of carbon fibre, glass fiber and Kevlar in epoxy matrix. The mechanical characteristics of plates made of composite materials (CM) reinforced are presented. Based on the results, a comparative study between the reinforced materials used to manufacture the plates of CM is carried out.
Applied Mechanics and Materials | 2015
Vladimír Bulej; Ivan Kuric; Adrian Popescu
The article deals with the design of the mould for plastic component production by injection moulding technology. There are described the basic steps of whole design process how to choose and design the suitable components with respect to fulfilling the technology requirements necessary for high quality products. The mould contains also the rotary cores with respect to the shape and dimensions of produced part, especially the thread surfaces. The mould flow analysis was carried out for the functionality demonstration.
Applied Mechanics and Materials | 2015
Grigore Marian Pop; Mihai Steopan; Glad Conțiu; Adrian Popescu
In this paper, an attempt has been made to model the surface roughness through response surface method (RSM) and ANOVA when drilling CFRP composites. Drilling is the most common machining process applied to CFRP. However, the users of this kind of composites are facing difficulties to machining it, due to its properties. Because of the bad effects that lubricants have on the fiber-reinforced composites, the machining of these materials is performed without coolant. On the other hand dry machining offers the risk of a thermal damage induced by high process temperatures. The current experimental analysis is focused towards determining process temperatures with different tools and drilling parameters.
ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING | 2014
Adrian Popescu; Liana Hancu; Emilia Sabău; Sever Adrian Radu
ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING | 2018
Adrian Popescu; Liana Hancu; Emilia Sabau
ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING | 2018
Nicolae Panc; Alina Popan; Adrian Sever Radu; Adrian Popescu