Papers by Constantin Opran
Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products
Key Engineering Materials, Jan 23, 2012
... 2.Prof.univ.PhD.Eng. POMAZAN Valentina Mihaela University of Mechanical Engineering and Marit... more ... 2.Prof.univ.PhD.Eng. POMAZAN Valentina Mihaela University of Mechanical Engineering and Maritime Industries Constanta, Romania, E-mail: [email protected] References ... [3]. DIAB AB: Divinycell, konstruktionscellplast. Information material. ...
The paper deals with a new and modern technology used to test the tightness of the vehicles radia... more The paper deals with a new and modern technology used to test the tightness of the vehicles radiators or heat exchangers. This technology involves a dry testing method, different from the present one, which requires huge amounts of water and afterwards drying devices, that lead to increased costs of the product and environmental damage. We intend to propose a new testing possibility and prove its advantages in comparison to the one used at the present moment.
Composite materials are difficult to machine than metals mainly because they are anisotropic, non... more Composite materials are difficult to machine than metals mainly because they are anisotropic, nonhomogeneous and their reinforcing fires are very abrasive. During machining, defects are introduced into the work piece, and tools wear rapidly. Traditional machining techniques such as drilling or sawing can be used with proper tool design and operating conditions. In this article is presented a review of traditional machining methods applied to organic and matrix composite.
Though adhesive bonding is a preferred method of joining fibrous composite, sometimes bolting of ... more Though adhesive bonding is a preferred method of joining fibrous composite, sometimes bolting of components is essential for operation, maintenance or inspection purposes. It is necessary to drill holes in fibrous composites for joining them by bolting. Drilling of fibrous composite presents many problems like -delaminating, fibre/resin pullout, excessive tool wear. In the present work, drilling of glass fibre/epoxy and carbon fibre/epoxy laminates is studied using high speed steel and tungsten carbide coated drills. The effect of cutting speed, feed and number of holes on tool wear, thrust and torque is studied.
Mathematical model for establishing the influence of an external magnetic field on characteristics parameters at ECM
A Model Regarding Material Removal Using FEM at Ultrasonic Aided EDM of Metal Matrix Composites
Applied Mechanics and Materials, 2015
Innovative Design of Polymeric Systems Used in Manufacturing of Gear Pumps
Applied Mechanics and Materials, 2015
Research Regarding Adaptive Design of Gear Pumps Used for Polymeric Products Engineering
Applied Mechanics and Materials, 2015
Ultrasonic System Design and Calculation for Polymer Metallization
Applied Mechanics and Materials, 2015
Procedia Engineering, 2015
This paper reviews experimental research regarding brittle materials processing with superfinishi... more This paper reviews experimental research regarding brittle materials processing with superfinishing machine The main criteria for determining the characteristics of superfinishing machines can be grouped into: energy consumption criterion, technologically criterion and dynamic criterion can be determined and the main criteria optimization plan lapping machines. The optimization of the characteristics of brittle materials superfinishing machine is very important because they directly influence the quality of workpieces surfaces. The performances of the superfinishing machine linkages are increasingly higher, due to the following requirements: very high quality workpieces surface, reduced time for feed workpieces to machine tools, better interconnections between machine tools are used in the technological process, high flexibility.
Procedia Engineering, 2015
This paper presents the results of the researches with application in production for the innovati... more This paper presents the results of the researches with application in production for the innovative realization of the double gear pumps with minimum axial gauge and minimum number of parts for the increase of reliability in use and reducing the production costs. The innovative design characteristic is represented by adaptive dimensioning with minimum gauge, depending on requirements, the type of drive, the fixing method, the connections for the hydraulic circuit and intermediary sealing between stages which allows the operation with different liquid mediums. The innovative technological characteristic is on integrated adaptive system (lean production) using computer assisted manufacturing on CNC machines with minimal production time and high quality. This way of production of double gear pumps is obtaining significant reductions in the cost of manufacturing and much smaller gauges the double pump available on the market.
<title>Numerical simulation of a laser-acoustic landmine detection system</title>
Laser Sources and Applications, 2012
ABSTRACT
Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products
Key Engineering Materials, 2012
... 2.Prof.univ.PhD.Eng. POMAZAN Valentina Mihaela University of Mechanical Engineering and Marit... more ... 2.Prof.univ.PhD.Eng. POMAZAN Valentina Mihaela University of Mechanical Engineering and Maritime Industries Constanta, Romania, E-mail: [email protected] References ... [3]. DIAB AB: Divinycell, konstruktionscellplast. Information material. ...
Numerical analysis of laser paint removal from various substrates
ROMOPTO 2012: Tenth Conference on Optics: Micro- to Nanophotonics III, 2013
ABSTRACT
Procedia Engineering, 2014
Micro injection molding is a domain which implies challenges for both producers of moulds and tec... more Micro injection molding is a domain which implies challenges for both producers of moulds and technologists. Due to special conditions required by the process of micro injection molding, chemical, physical and thermal properties of the injected polymeric material are affected, material behaviour is different compared with that during the classical process of injection moulding and so, optimization of parameters of the injection process is needed. This work has shown the process of optimization of micro injection in template given a medical application. A numerical analysis has been performed using the Autodesk Moldflow Insight software given a "surgical micro-stitch" marker device.
Procedia Engineering, 2014
3D computer graphic artists have focused more on animated films, broadcast, feature films, intera... more 3D computer graphic artists have focused more on animated films, broadcast, feature films, interactive video games, visual effects and web. Especially for industrial and technical design, rendering process is not given due attention. This paper presents a way to achieve realistic images in the technical field. Creating quality images in CAD programs depends on Render. Render is the process of creating a sequence of images of a scene. CAD graphics programs make intense mathematical calculations and apply the laws of physics to achieve in a realistic way light, shadows, reflections and textures. The render of lights, shadows and textures is realized using Render software that includes two basic categories: ray casting and ray tracing. Ray casting can lead to the creation of high-quality images using light, shadows, textures and different effects. However, for a greater realism, requires reflection and refraction which can be achieved with ray tracing.
The Mathematical Model of the E.C.M. with Magnetic Field
CIRP Annals - Manufacturing Technology, 1989
ABSTRACT
Mathematical Model for the Establishment of the Materials Machinability*
CIRP Annals - Manufacturing Technology, 1995
ABSTRACT
Determination of Tool Cutting Capacity
CIRP Annals - Manufacturing Technology, 1992
ABSTRACT
The Study of EDM with Forced Vibration of Tool-Electrode*
CIRP Annals - Manufacturing Technology, 1990
ABSTRACT
Uploads
Papers by Constantin Opran