Fatigue Crack Growth Rate of the Long Term Operated Puddle Iron from the Eiffel Bridge

Metals

PedroA. Montenegro¹  AbílioM. P. De Jesus¹  RuiA. B. Calcada¹  JoséA. F. O. Correia¹  Michał Smolnicki²  Monika Duda²  Grzegorz Lesiuk² 

[1] Faculty of Engineering (FEUP), University of Porto, PT-4200-464 Porto, Portugal;Faculty of Mechanical Engineering, Department of Mechanics, Materials Science and Engineering, Wroclaw University of Science and Technology, PL-50370 Wrocław, Poland;

关键词: puddle/wrought iron;    fatigue crack propagation;    mixed-mode loading;    old steel;    microstructure;   

DOI  :  10.3390/met9010053

来源: DOAJ

【 摘 要 】

The paper summarises an experimental study on the fatigue crack propagation and cracks paths in ancient steel—19th-century puddle iron from the Eiffel bridge. The tests were performed with the load R-ratio equal to 0.05 and 0.5. All tests were performed under different notch inclinations (mode I + II). The fatigue crack growth rate in the tested material is significantly higher than its “modern” equivalent—low carbon mild steel. The crack closure phenomenon occurs in specimens during the process of crack growth. Understanding this aspect is crucial for the examination of a stress R-ratio influence on kinetic fatigue fracture diagram (KFFD) description. Both the experimental and numerical approach, using the HP VEE environment, has been applied to the crack closure as well as the crack opening forces’ estimation. These analyses are based on the deformation of the hysteresis loop. The algorithm that was implemented in the numerical environment is promising when it comes to describing the kinetics of fatigue crack growth (taking into consideration the crack closure effect) in old metallic materials.

【 授权许可】

Unknown