PSI - Issue 76

Vladimír Chmelko et al. / Procedia Structural Integrity 76 (2026) 131–137

136

Fig.7 Influence of grinding the edge of sheet metal cut with a cutting tool on the S-N curve of the material S500.

4. Conclusions The paper uses experimental analysis to identify specific effects on the fatigue life of structural components made by cutting from rolled sheets:

residual stresses (positive) surface roughness (negative)

• • •

sharp edge on a rectangular cross-section (negative) There is space for improvement in the strength and durability of the components manufactured from sheet by reducing the variance of the cyclic results on the cuting side of the cyclic test results in the highcycle fatigue region. To achieve this, it is necessary to: • grind the surface after chopping with a tool • prefer laser cutting to tool cutting for better fatigue properties • rounding edges on rectangular cross-sections to eliminate the negative effect of a sharp edge References [1] Milne,I., Ritchie R.O. and Karihaloo B., 2003. Comprehensive Structural Integrity. Elsevier, Amsterdam. [2] Vayas, I., Ermopoulos, J., Ioannidis, G., 2019. Design of Steel Structures to Eurocodes, Springer. [3] Chmelko, V., Garan, M. Long-term monitoring of strains in a real operation of structures. Proc. of 14th IMEKO TC10 Workshop, Politechnic University of Milan, 2016, p. 333-336. [4] Chmelko, V., Garan, M., Šulko, M., Gašparík, M., 2020. Health and Structural Integrity of Monitoring Systems: The Case Study of Pressurized Pipelines. Appl. Sci., 10, 6023; https://doi.org/10.3390/app10176023. [5] BS 7608:2014+A1, 2015: Guide to fatigue design and assessment of steel product. BSI standards publication; https://doi.org/10.3403/30102063 [6] Forschungskuratorium Maschinenbau (FKM) (2012): FKM-Richtlinie: Rechnerischer Festigkeitsnachweis für Maschinenbauteile aus Stahl, Eisenguss- und Aluminiumwerkstoffen. Frankfurt am Main: VDMA-Verlag