Open AccessCalibration of nasgro equation for mixed-mode loading using experimental and numerical data
Author(s) -
David Reinaldo Berrios-Barcena,
Rosendo Franco-Rodríguez,
Francisco Aurelio Rumiche-Zapata
Publication year - 2019
Publication title -
revista facultad de ingeniería universidad de antioquia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.16
H-Index - 12
eISSN - 2422-2844
pISSN - 0120-6230
DOI - 10.17533/udea.redin.20191258
Subject(s) - materials science , cantilever , calibration , structural engineering , stress (linguistics) , numerical analysis , stress intensity factor , mode (computer interface) , fracture mechanics , mechanics , composite material , mathematics , mathematical analysis , computer science , statistics , engineering , physics , linguistics , philosophy , operating system
A procedure to calibrate the NASGRO equation in a high yield-strength steel under mixed-mode loading (I + II) is presented. The calibration consists in obtaining the material parameters known as C, m, p and q. The procedure is based on experimental and numerical results. The experimental tests were used to characterize the material and obtain fatigue crack growth data. For the fatigue tests, tapered double cantilever beam (TDCB) specimens with different maximum load and load ratio values were used. Through the numerical analysis, the stress intensity factors, the crack growth direction and the crack path coordinates were calculated. The numerical analysis was performed using XFEM and the maximum energy release rate criterion. The calibrated model allows predicting the number of load cycles with an RMS value of less than 5%, compared with the experimental results.