Welding is a technique of fusion joining the material involving process inter-molecular diffusion adhesion. Polymer welding an assembly method among several known techniques such as gluing. This applies to thermoplastics; they have rheological or softening characteristics during melting. fast and controlled in order obtain solid durable mechanical connection on series parts. study focuses weldability high density polyethylene (HDPE) using friction stir technique. A parametric choice was made...

Generally, implants fixations in orthopedic surgery are insured by bone cement; which is generated mainly from polymer polymethylmethacrylate (PMMA). Since, the cement identified as weakest part among bone-cement-prosthesis assembly. Hence, characterization of mechanical behaviour a crucial requirement for orthopaedic surgeon’s success. In this study, we investigates failure cement, under combined shear and compression loading, aim to determine strengths different mode loading conditions....

In Algeria, polyethylene (PE) pipes are commonly installed for the distribution of potable water and natural gas in urban rural areas. They used economic reasons, addition to perfect maintenance, compared metal pipes. The experiences these tube installations have shown technical advantages operational safety aspects structures lifespan with very interesting mechanical properties. connection between is done through couplings, which considered expensive during their replacement due frequent...

Friction stir spot welding (FSSW) is a very important part of conventional friction (FSW) which can be replacement for riveted assemblies and resistance welding. This technique provides high quality joints compared to processes. new technology adopted join various types metals such as titanium, aluminum, magnesium. It also used polymer materials are difficult weld by the process. In industrial applications, density polyethylene (HDPE) becomes most material. The parameters mechanical...

To evaluate the integrity of a structure consists to prove his ability perform mechanical functions for all modes loading, normal or accidental, and throughout its lifespan. In context nuclear safety, most important welded structures such as tank primary circuit, we consider that presence degradation grouping several aspects, cracks which created during welding. We seek then, from sizing, show strength this degraded mode. also seek; in crack when defects have been detected an inspection,...

Welding is used to realize permanent assembly in mechanical structures assure the continuity of parts be assembled contrary other techniques which have physical or chemical discontinuities. Generally, crack evolution depends on several intrinsic and extrinsic parameters material. The aim this work analyse severity defects behaviour Welded joints. cracks are considered located weld metal. J-integral method was fracture these by two-dimensional finite element using Cast3M code. effect...

In the process of forming solid materials, plastic instability phenomena often control appearance and performance finished product. The study these is therefore great scientific technological importance. Polymers for example, polyvinyl chloride (PVC) are frequently used in pipes pressure vessels pipelines, which require details that more serious, it essential to understand mechanisms polymers order know how them. determine behaviour PVC, true stress-strain response under large deformation...

Bobbin friction stir welding (BT-FSW) is a variant of the conventional (C-FSW). This method has been applied high density polyethylene (HDPE) plates; where rotating symmetrical tool causes fully penetrated bond, it can weld upper and lower surface work-piece in same pass. BT-FSW process involves complex heat generation HDPE flow, which directly affects on area mechanical properties welded joint. Heat material flow during are significantly affected by design features, parameters behavior work...

The number of supporting dental implants is an important criterion for the surgical outcome bridge fixation, which has considerable impact on biomechanical load transfer characteristics. Excessive stress at bone–implant interface by masticatory loading may result in implant failure. aim this study was to evaluate neighboring tissues around implants. Results will provide useful information appropriate techniques fixation. In study, osseointegrated smooth cylindrical same diameter and length...

Welding polymers by the friction stir welding (FSW) technique is one assembly process among several known techniques which consists in two materials without filler material. The FSW based on generation of heat due to and material deformation under an axial force. Among main aspects affecting flow, choice tool geometry has become great interest improve welds quality. objective this work using technique. A new method HDPE (high density polyethylene) plates, called BT-FSW (bobbin welding) was...

In this work, we focus on a new generation of polymer named Polybutylene terephthalate (PBT). order to analyse and determine true behaviour polymer, special experimental method was used. Hence, the stress/strain responses are investigated under large plastic deformation in different stress triaxiality frameworks with particular attention volumetric strain evolution, their decomposition an elastic strain, pure shear. Moreover, effect instability fracture is also examined. With analysis, it...

This research paper aims at studying the friction stir spot welding (FSSW) some of thermoplastic polymer materials (HDPE and HDPE-PMMA) using a specifal geometry tool without pin. The effect on welds static resistance was studied via several shape, flat shape below tool, with concavity angles ranging from 0° to 16° , flange sharp-edged chamfered rounded shape. work is done increase surface area weld further maximize strength welding. Experimental tests have been carried out under various...

The objective of the current work is to analyze influence water cooling high density polyethylene (HDPE) sheet welding by friction stir process (FSW) on mechanical strength, based microhardness tests. In present work, using conventional tool (C-FSW) presented with new procedure developed for FSW HDPE, called (W-FSW). Test results water-cooled and non-cooled welded samples were compared. HDPE sheets initially process, intensive was performed weld after exceeded initial position 30mm. rotation...

In manufacturing operations, numerous parts and components are formed into different shapes by applying external forces to the workpiece, typically means of various tools dies.Common examples such operations forging, extruding, drawing rolling.Forming may be carried out at room temperature or elevated temperatures, a low high rate deformation.These also used in forming shaping non-metallic materials as plastics ceramics.However, processes working polymers solid state affected phenomena...

The modeling of the welding is desirable to guess deformation components during manufacture, position and magnitude maximum residual stresses envisage metallurgical effects in specific zones. are problems complex requiring thermal structural solutions. This has lead development several software packages codes for simulation by finite elements. condition, properties structure their interactions have significant influences on responses (temperature history, distortion, stress) welded...