In recent years, numerous scientific and technological innovations have been introduced in the fields of medicine dentistry. The application computer-based engineering techniques has enabled significant improvement design performance biomedical components, including implants prostheses. Innovative flexible manufacturing methods, such as single point incremental forming (SPIF), allow cost-effective production these "custom-made" components. SPIF technology employed to manufacture a metal...

Single point incremental forming (SPIF) is one of the most promising technologies for manufacturing sheet metal prototypes and parts in small quantities. Similar to other processes, design SPIF process a demanding task. Nowadays, usually performed using numerical simulations virtual models. The modelling faces several challenges, including extremely long computational times caused by tool paths complexity problem. Path determination also This paper presents finite element (FE) analysis an...

This study describes in detail the mechanical properties of polymethylmethacrylate (PMMA) denture base resins with regard to fabrication procedures, moulding and thermoforming.The investigation included eight specimens each group materials, made separately for experimental protocol (moulding thermoforming).Analysis tested was comprised tensile 3-point bending strengths, elongation, fracture toughness micro-hardness tests.Data obtained from tests were statistically processed by using one-way...

In this paper, the distribution of contact stresses along die-workpiece interface as well elastic deformation behavior die in cold backward extrusion steel billets have been investigated both experimentally and numerically.For experiments, a special tooling set including pin load cell measuring device was designed made.Contact were recorded at various points time locations during process, i.e. for different punch strokes (part's bottom thickness).The research focus on determining ratio's...

The paper presents and analyzes the results of experimental tests performed on two non-alloy low carbon steels (1.1141 1.0122) in cases their exposure to impact fracture energy uniaxial high cyclic mechanical stress-controlled fatigue. provide insight into changes Charpy V-notched test specimen that occur as a result temperature changes. also response tested materials high-cycle fatigue at room an air atmosphere different applied stress ratios. Material refer symmetric (R = -1), asymmetric...

The strain-based and stress-based workability diagrams are often used to predict the initiation of ductile fracture in metal forming. diagram is restricted free surface postulates that independent strain path. It shown present paper under these conditions identical diagram. Using an available found a much larger domain space two in-surface principal strains as compared typical covered by standard tests determine diagrams. Two feasible designed complete

Knowledge of the properties and behavior materials under certain working conditions is basis for selection proper material design a new structure. This paper deals with experimental investigations mechanical unalloyed high quality steel S235JRC + C (1.0122) its temperatures, creep fatigue. The response at temperatures (20–700 °C) shown in form engineering stress-strain diagrams while that (400–600 curves. Furthermore, based on uniaxial fully reversed fatigue tests (R=−1), stress-life (S-N)...

Welded structures are exposed to constant variable loads during their exploitation in real conditions. A load affects the integrity and life of a welded structure; therefore, it is practical importance understand fatigue behavior, especially behavior under impact low-cycle fatigue. The effect very prevalent an assessment cyclic loading material entails modifications its properties characteristics related dependence stress strain. Since stress-strain response form hysteresis loop, this paper...

Aluminum is a metal that being increasingly used in the packaging industry modern forming technology, but it also provides good opportunity for effective advertising and product promotion. Processing technologies aluminum plastic deformation ensure superior meets most rigorous demands food, pharmaceutical, chemical, other industries. It case of mass production with very little material loss offers possibility multiple recycling. On hand, today's products general purpose consumers cannot be...

Over the last few year, metalworking sector has been undergoing rapid and radical transformations driven by global competition revision of production focus that is being moved from mass customization to individualization. A results this introduction new manufacturing strategies such as Industry 4.0, a concept combines cyber-physical systems promote communication connectivity. Therefore, changes not only face but also causes transformation existing business models society whole. This paper...

This paper aims to develop a method for determining the workability diagram by varying frictional conditions in cylinder upsetting test. The is based on known theoretical relationship between average stress triaxiality ratio and in-surface strains if initiation of fracture occurs at traction-free surface. valid any rigid/plastic strain hardening material obeying Mises-type yield criterion its associated flow rule, which shows wide applicability method. experimental input path site...

When divided material flow is enabled during extrusion process, the required forming load lower compared to a conventional process.The reduction of leads higher quality extruded part and longer tool life.One way achieve application relief opening, either in billet or tool.In this paper, theoretical solution based upon Upper bound theorem was used determine for radial gear-like element with straight parallel flank profile.Two possible positions openings were analysed -in centre...

Polimerni materijali jedni su od najvažnijih materijala koji se koriste u medicini i farmaciji. U radu je dat prikaz najčešće upotrebljavaju, njihove osobine kao primeri primene praksi. Takođe, opisani postupci prerade ovih materijala.

U ovom radu prikazano je konstrukciono rešenje alata/kalupa za injekciono presovanje fitinga lukova i , koji predstavljaju standardne elemente kanalizacione instalacije. Pored toga, primenom softverskog paketa Moldex3D izvršena analiza procesa po fazama u cilju provere validnosti konstrukcije alata usvojenih tehnoloških parametara.

In the industrial processes of injection molding, one basic requirements is a uniform temperature filed within workpiece and mold cavities. case simple geometry with single cavity achieving field not critical issue. However, if deals parts complex geometries, multi-cavity molds asymmetric layout different forms in additional analyses runner cooling system are necessary order to obtain required quality accuracy end products. Disposition dimensions both runners channels directly related...

In this paper, the microstructural damage evolution of a steel with ferrite–pearlite microstructure (C45E) was investigated during process cold upsetting. The development and accumulation were analyzed in different areas samples that deformed at strain levels. scanning electron microscopy (SEM) results showed various mechanisms nucleation microcavities occurred upsetting process. quantitative terms, predominantly generated pearlite colonies due to fracture cementite lamellae. addition,...