PSI - Issue 72

Yuriy Panchuk et al. / Procedia Structural Integrity 72 (2025) 216–221

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4. Conclusions 1) This document presents the procedures for manufacturing and conducting experimental studies on prism samples made of fine-grained and coarse-grained concrete under high levels of low-cycle loads. 2) A fractional linear function was derived, depicting the relationship between the “level of cyclic l oading η cyc and the number of loading and unloading cycles of the specimen before fracture n cyc .” 3) The limits of low-cycle fatigue for the studied concretes were determined as n cyc → ∞. The value η cyc =0.906 corresponds to the low-cycle fatigue limit for FGC, η cyc =0.841 for SGC-1, and η cyc =0.747 for SGC-2. 4) Hyperbolic curves were constructed in the coordinate system of “stress level η cyc versus the number of load cycles n cyc ,” which the sample withstood before fracturing. 5) The presence of coarse aggregates in the concrete samples of CGC-1 and CGC-2, along with chemical processes occurring in the cement component of CGC-2 due to the influence of the Dophen additive, leads to concrete shrinkage, which reduces the low-cycle fatigue limit. In contrast, the more uniform structure of the material and the absence of coarse aggregates in samples made from FGC result in an increased low-cycle fatigue limit. References Abendroth, M., Soltysiak, S., 2016. Assessment of material properties by means of the small punch test. 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