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Aditivna proizvodnja ali 3D tisk je tehnika za proizvodnjo izdelkov s kompleksno geometrijo in je še posebej primerna za aplikacije v letalstvu in avtomobilski industriji. V zadnjih letih se tehnologija zelo razširja, vse več izdelkov se želi izdelati iz kovin. Tako nastaja problem po zanju, zmožnostih izdelave, predvsem pa po standardizaciji procesa. Problem iz stališča tribologije je zelo obširen, saj z vsakim tiskom izdelamo nov material, s katerim povsem spremenimo tribološke lastnosti v drsnem kontaktu. Na osnovi pregleda literature in testiranja se želi izboljšati razumevanje na področju procesa izdelave izdelkov in triboloških lastnosti, kot so obraba in trenje. Ugotovljeno je bilo, da je v primeru tiskanja kovin najprimernejša metoda selektivnega laserskega taljenja. Za izdelavo posameznega materiala, ključno vplivajo parametri tiska kot so moč, prekrivanje, hitrost laserskega žarka in debelina plasti prahu. S tribološkega stališča je količina raziskav in obravnavanih materialov zelo omejena, vendar rezultati kažejo, da lahko z ustrezno strukturo izdelamo izdelke, ki imajo boljše mehanske in tribološke lastnosti kot pri klasični izdelavi. Additive manufacturing or 3D printing is a production of complex geometries and is commonly used in aerospace and automotive industry. In the last years, steel alloy usage has been increased rapidly. However, there is still lack of research and standardization. From tribology point of view, there is a diverse material characterization and consequently immense differences in tribological performance, like wear and friction. Based on literature review and experimental analysis, the work tries to understand these correlations and performance improvements. Generally the most common printing method is selective laser melting, which parameters, like scan speed, laser power, hatch space and thickness of powder layer have a vital influence. All in all, the research concludes that with a efficient and appropriate parameter selection of the designed material, we can get a better mechanical and tribological performance than materials made by conventional process.

Delo obravnava razvojno vrednotenje vodnega kolesa, ki se je pod obremenitvami porušilo. Na podlagi hidravličnih, trdnostnih in deformacijskih značilnosti so določene obremenitve zaradi vodnega curka, ki nateka na lopute. Izveden je numerični model za določitev napetostnih stanj v gredi, povezavi in zvaru. The paper deals with the developmental evaluation of a water wheel that was demolished under the load. On basis of hydraulic, strength and deformation characteristics, the load due to the water jet that flows into the flaps is determined. A numerical model for determination of stresses in the shaft, connection and weld is made.