Wyniki wyszukiwania - BazTech

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Compressive properties of cell structures manufactured by photo-curing technology liquid polymer resins - Polyjet Matrix

Rudnik Mateusz

Mechanik

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2022

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R. 95, nr 1

12--14

EN

The article presents the results of compressive strength tests of cylindrical samples with a hexagonal cell structure. The samples were made of MED 610 material using the photo-curing technology liquid polymer resins. The compressive strength was estimated on the basis of a static compression test of the printed elements. It has been shown that the PolyJet Matrix 3D printing technology enables the printing models with a thin-walled cell structure, which, while maintaining the appropriate strength properties, can be used in the design and production of certain utility models.

PL

Przedstawiono wyniki badań wytrzymałości na ściskanie próbek cylindrycznych o heksagonalnej strukturze komórkowej. Próbki wykonano z materiału MED 610 z zastosowaniem techniki fotoutwardzania ciekłych żywic polimerowych. Wytrzymałość na ściskanie oszacowano na podstawie statycznego testu ściskania elementów drukowanych. Wykazano, że technologia druku PolyJet Matrix 3D umożliwia drukowanie modeli o cienkościennej strukturze komórkowej, co - pod warunkiem zachowania odpowiednich właściwości wytrzymałościowych - może być wykorzystane przy projektowaniu i produkcji niektórych wzorów użytkowych.

2

Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites

Ranachowski Z., Ranachowski P., Brodecki A., Kopeć M., Kudela S. jr.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

893--899

EN

Two types of composites, consisting of pure magnesium matrix reinforced with two commercially used carbon fibers, were systematically studied in this paper. The composites fabricated by the pressure infiltration method, were subjected to quasistatic and dynamic compression tests. Morphology of fiber strands was observed using scanning electron microscope (SEM). The application of carbon fibre reinforcement led to the stiffening of tested materials, resulting in the limitation of the possible compression to approx. 2.5%. The performed tests revealed the remarkable difference in compression strength of investigated compositions. The cause of that effect was that GRANOC fiber reinforced composite exhibited insufficient bond quality between the brittle fibers and the ductile matrix. T300 reinforced composite presented good connection between reinforcement and matrix resulting in increased mechanical properties. Investigated composites demonstrated higher mechanical strength during deformation at high strain rates. Microscopic observations also proved that the latter fibers with regular shape and dense packaging within the filaments are proper reinforcement when designing the lightweight composite material.

3

Microstructure and Compression Properties of Fe-Cr-B Alloy Manufactured using Laser Metal Deposition

Joo Y.-A., Yoon T.-S., Park S.-H., Lee K.-A.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 3

1459--1462

EN

Fe-Cr-B alloy is a material with precipitation of boride inside Fe matrix, and it features outstanding hardness and wear resistance properties. However, Fe-Cr-B alloy is a difficult material to process, making it difficult to use as a bulk type structure material which requires delicate shapes. This study attempted to manufacture Fe-Cr-B alloy using a 3D printing process, laser metal deposition. This study also investigated the microstructure, hardness and compression properties of the manufactured alloy. Phase analysis results is confirmed that α-Fe phase as matrix and (Cr, Fe)2B phase as reinforcement phase. In the case of (Cr, Fe)2B phase, differences were observed according to the sample location. While long, coarse, unidirectional needle-type boride phases (~11 μm thickness) were observed in the center area of the sample, relatively finer boride phases (~6 μm thickness) in random directions were observed in other areas. At room temperature compression test results confirmed that the sample had a compression strength is approximately 2.1 GPa, proving that the sample is a material with extremely high strength. Observation of the compression fracture surface identified intergranular fractures in areas with needle-type boride, and transgranular fractures in areas with random borides. Based on this results, this study also reviewed the deformation behavior of LMD Fe-Cr-B alloy in relation to its microstructures.

4

Mechanical properties and abrasive wear behaviors of in situ nano-TiCx/Al–Zn–Mg–Cu composites fabricated by combustion synthesis and hot press consolidation

Gao Y. Y., Qiu F., Shu S. L., Wang L., Chang F., Hu W., Han X., Li Q., Jiang Q. C.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 1

179--187

EN

The in situ nano-TiCx/Al–Zn–Mg–Cu composites with different TiCx content (20, 25 and 30 vol.%) were successfully fabricated by combustion synthesis and hot press consolidation in Al–Ti–C/CNTs systems. The compressive properties and abrasive wear resistance of the composites improved with the increase in the TiCx content. The transformation of carbon source from pure C black to the mixture of C black and CNTs to pure CNTs in Al–Ti–C/CNTs systems leaded to a significant improvement in the compressive properties and wear resistance of the composites as well as a significant decrease in the average size of TiCx particles. The average size of the nano-TiCx particles in 30 vol.% TiCx/Al–Zn–Mg–Cu composite synthesized by the carbon source of CNTs reached 81 nm, moreover, the yield strength (σ0.2), the ultimate compression strength (σUCS) and the fracture strain (ɛf) of the composite reached 597 MPa, 882 MPa and 21.7%, respectively.