Polypropylene or polypropene (PP) is a thermoplastic polymer, made by the chemical industry and used in a wide variety of applications, including food packaging, ropes, textiles, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, polymer banknotes and vehicle components. The authors had tested the behavior of polypropylene used in the fabrication of vehicle components (internal part of doors, instrument panels,

The analysis has as purpose to notice the elements that can produce incidents during the running of the regulating apparatus of bulb turbines. The analyzed regulating device has a robust construction. Although, a critical element is the connecting rod which can produce two types of incidents: a) the detachment from the joining bolt of the regulating ring and b) the uncontrolled modification of the length during the running. The kinematical analysis

Paper describes a method used to verify the total time of tests, for vibratory cavitation erosion facilities.

Paper presents yhe mechanical and cavitation characteristics of 14 materials tested in Timisoara Hydraulic Machinery Laboratory. The experimental work was done in magnetostrictive T1 and piezoceramic T2 vibratory devices.The cavitation characteristics obtained in this way are used for the generalization of the relation presented by Steller and Sakai-Shima and a correlation was made between the parameters A,f,d, specific to the cavitation process

One of the most efficient methods for prevention or slowing down the corrosion is the improved selection of chemical resistance of the employed material and the optimization of the microstructure by adequate heat treatments. The present work is concerned with characterizing the corrosion resistance of four martensitic stainless steels, cast by SC UCM Resita after genuine recipe and having a content of (13…17)% chromium and (0…4)% nickel. Before

This paper presents some considerations about influences of the milling process on the quality of plastic materials in the process of recycling. There are presented the advantage and disadvantage of the use of the proposed milling system, economic and serial implications. Special part is destined on the technologies processes, granulometric analyze and equipment

In the paper, a stress strain analysis in the area of central ligament of a cruciform glass-epoxy specimen is presented. Investigation was done experimentally, using strain gauges technique , by application of six gauges in the stress concentration area. The validation of a theoretical model (a special type of a finite element), wich was created by authors of the laminate composite structure, was the aim of this study. A goog agreement between numerical

The paper analyzes the characteristic features of building up joinings by friction welding between carburized and nitrided steels having a carbon or nitrogen concentration gradient in the cross section. The metalographic examinations, electronic microprobe investigations and hardness tests allow to appreciate yhe quality of the weldid joints. In the joining interface, the material enriched with carbon, nitrogen and axial diffusion were evidenced.

Paper scientifically substantiates the basic criteria in designing the chemical composition of stainless steels 17-4 P.H. with controlled transformation. All the new designed steels for hydraulic turbines are compulsory tested to cavitatation erosion in two states: putting into solution quenching followed by refrigeration and aging through tempering or putting into solution quenching followed by primary and secondary aging. In this research, after