RT Journal Article
T1 The influence of specimen thickness on the midplane plastic zone using synchrotron X-ray diffraction data
A1 Aguilera-García, José Antonio
A1 Moreno Cerezo, Pablo
A1 Sánchez-Cruces, Manuel Alejandro
A1 Moreno, B.
A1 Withers, P. J.
A1 Lopez-Crespo, Pablo
K1 Materiales - Fatiga
K1 Sincrotrones
K1 Rayos X - Difracción
AB Analysing and measuring the plastic zone surrounding a fatigue crack tip is essential for a comprehensive understanding of fatigue and fracture behaviour. In this work, the strain field near the crack tip was mapped for two samples having different thicknesses, namely 3.3 mm and 12 mm, using in-situ synchrotron diffraction during a fatigue test. Full diffraction pattern refinement enabled strain maps with a resolution of up to 80 µm. Assuming a two dimensional state of stress or strain, depending on the sample thickness and due to the limitations of the experiment, the von Mises equivalent stresses and strains in the region ahead and surrounding the crack tip were mapped at each stage. The equivalent strain energy density rule is used, taking into account cyclic material parameters, to understand the elasto-plastic fields around the crack-tip. The plastic zones were then characterised and compared to simple plane stress and strain analytical models of the plastic zones. The plastic zones closely align with the analytical models in size, though shape variations exist. The sample thickness was found to have a strong influence on the final shape and size of the PZ.
PB Elsevier
SN 0142-1123
YR 2025
FD 2025-03-23
LK https://hdl.handle.net/10630/38517
UL https://hdl.handle.net/10630/38517
LA eng
NO Aguilera, J. A., Cerezo, P. M., Cruces, A. S., Moreno, B., Withers, P. J., & Lopez-Crespo, P. (2025). The influence of specimen thickness on the midplane plastic zone using synchrotron X-ray diffraction data. International Journal of Fatigue, 197, 108954.
NO Funding for open access charge: Universidad de Málaga / CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 12 abr 2026