Maria Luminita Scutaru

Advanced high-density polyethylene used in pipelines networks

Abstract This paper presents the most important results obtained during tensile tests carried out on high-density polyethylene (HDPE) for pipelines used for water supply networks. Various specimens have been cut from HDPE 20 x 2 mm, 63 x 4 mm and 90 x 6 mm pipelines and subjected to tensile and four-point bending loads to determine their mechanical properties including stiffness and Young’s modulus. Load-extension distributions have also been determined. Two special cases of composite pipelines have been taken into consideration in theoretical approach: the cross-ply composite pipeline and the balanced angle-ply composite one, both subjected to internal pressure. In tensile tests, the stiffness evaluation of high-density polyethylene pipelines used for water supply networks put into evidence that the Young’s modulus and stiffness increase with the increase of pipelines’ diameter.

Dynamic Analysis of the Reaction Chamber for the ELIADE Array

The ELI-NP Array of DEtectors (ELIADE) is one of the experimental setups being built at ELI-NP. The reaction chamber for the ELIADE array is, together with the CCD camera the goal of research team. The precision of the experiment make important the small deformation and the vibration of the equipment. To study this, a model using Finite Element Method is used. The device consists of elastic elements to a smaller or greater extent. Usually, if the velocities and the occurring loads are low then the rigid elements hypothesis can lead to an excellent model. But in the experiment that will be conduct in the laboratory with ELIADE, precision is so important that it require extremely small deformation of the device. For this a model that takes into account the elasticity of the body must be used in order to study the movement of the part of the device during the experiment.

Universal Absorber Applied to NVH in EV’s Powertrain

Inertial dampers ensure, through the structural design, mechanical energy dissipation due to vibration or noise generating source. Also these dampers allow, as result of vibration energy dissipation in volume of plastics on the one hand and as result of dissipative higher power efficiency and stability on the other hand (due to the high energy absorption distributed system) the use of corresponding nonlinear zone flexibility based plastics. Moreover, the spatial distribution of inertial masses ensure a more uniform thermal loading plastic base and can be achieved without breaking conditions thereby avoiding pregnancy and the development of concentrators zones in basic plastic. The same spatial distribution in conjunction with inertial masses form, their surface roughness and especially the flexibility of plastics allow obtaining anisotropic features extremely useful. In this paper a study of a such type of damper is made.