RT Journal Article
T1 A Novel Approach for ∆K Estimation in the Fatigue  Threshold Region Based on ΔKth and Kmax,th
A1 Moreno Cerezo, Pablo
A1 Aguilera, Jose A.
A1 Sánchez-Cruces, Manuel Alejandro
A1 López-Crespo, Pablo
K1 Materiales
K1 Ingeniería Civil
AB A novel procedure, proposed by Kujawski and Vasudevan 1, has been evaluated as an alternative to the ASTM E647 stand ard for determining the ∆Kth and Kmax,th thresholds. This method relies solely on the actual propagation of cracks, which oc curs only when both thresholds are satisfied simultaneously. For long cracks, a more efficient estimation of thresholds can be achieved. Compared to the ASTM E647 standard (R=0.1, ∆Kth=2.95MPa√m), the new methodology for the same R yielded a value of ∆Kth=2.50MPa√m and determined a maximum stress threshold of Kmax,th=3.35MPa√m. A correlated parameter, K*=Kmaxα·∆K1-α, α=0.5 for Al 2024 T3 alloy, was employed to provide an effective relation between the loading ratio and the threshold conditions, with K* values ranging from 2.8 to 3MPa√m for R-ratios from 0.1 to 0.7. The implementation of this tech nique has the potential to reduce testing time and postprocessing efforts by minimizing the need for crack propagation calcu lations. This method provides valuable insights into the material behavior near the fatigue threshold for the specific cases and material investigated.
PB Wiley
YR 2025
FD 2025
LK https://hdl.handle.net/10630/40927
UL https://hdl.handle.net/10630/40927
LA eng
NO Cerezo, P. M., Aguilera, J. A., Cruces, A. S., & Lopez-Crespo, P. (2025). A novel approach for ∆K estimation in the fatigue threshold region based on ΔKth and Kmax,th. Fatigue & Fracture of Engineering Materials & Structures, 0, 1–10. https://doi.org/10.1111/ffe.70135
NO Funding for open access charge: Universidad de Málaga/CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026