The influence of the load level during cyclic torsion on the fatigue life and fracture surface of tin-zinc-lead bronze RG7

• Autorzy: Małecka Joanna , Żak Krzysztof , Łagoda Tadeusz

Identyfikatory

DOI

10.12913/22998624/205280

• Języki publikacji: EN

Abstrakty

EN

The study analysed samples made of tin-zinc-lead bronze RG7 after fatigue tests under cyclic torsion conditions. The behaviour of the material used in both mechanical and building structures was analysed. Samples made for various load levels were subjected to this analysis. Fatigue cracks during cyclic torsion of samples made of RG7 bronze were analysed for nine load levels. Fatigue crack surfaces were analysed, with particular emphasis on the crack direction. For lower loads, the macroscopic fatigue crack surface is inclined at an average angle of 40°. The angle of the inclined plane of the cyclic torsion crack tends to decrease with increasing stress amplitude. The less load the tested samples carry, the more uniform the appearance of the crack surface. In the case of samples tested at lower stresses, a crack zone was observed in the lower part of the crack, which was damaged in the final phase of the test. This part of the crack was characterised by a rougher surface, where the tearing of material grains could be observed. The 3D surface analysis showed that a large fractal dimension was obtained for the stress amplitude τan in the range of higher loads, indicating the surface's high complexity. Analysing the isotropy of the surface using the Str parameter and assessing the percentage level of isotropy, it can be concluded that the obtained surfaces have a periodic anisotropic character, which proves that a structure subjected to high stresses has a directed and dominant direction of cracking.

Słowa kluczowe

EN

tin-zinc-lead bronze; cyclic torsion; torsion surface; surface topography; fractals

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2025
• Tom: Vol. 19, no. 8
• Strony: 395--412
• Opis fizyczny: Bibliogr. 37 poz., fig., tab.

Twórcy

autor

Małecka Joanna

• Opole University of Technology ul. Prószkowska 76 45-758 Opole, Poland

• https://orcid.org/0000-0003-0974-9328

autor

Żak Krzysztof

• Opole University of Technology ul. Prószkowska 76 45-758 Opole, Poland

• https://orcid.org/0000-0002-0157-3340

autor

Łagoda Tadeusz

• Opole University of Technology ul. Prószkowska 76 45-758 Opole, Poland

• https://orcid.org/0000-0002-2815-3311

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