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Measurement of fatigue crack growth in large compact tension specimens using an AC magnetic field method
Author(s) -
Austin J.
Publication year - 1999
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1999.00136.x
Subject(s) - paris' law , materials science , compact tension specimen , tension (geology) , crack closure , fracture mechanics , fracture (geology) , crack growth resistance curve , composite material , structural engineering , engineering , ultimate tensile strength
Fatigue crack growth rate data are required in order to carry out a numerical analysis of the fatigue performance of complex structural components. These data are obtained by measuring crack growth in standard fracture mechanics specimens. A new method for measuring fatigue crack growth in compact tension specimens has been developed. The technique is based on the measurement of the surface magnetic fields produced when passing a high‐frequency alternating current through the specimen. Fatigue crack growth data recorded using this method indicated an accuracy of ±0.02 mm when compared with optical measurements. The technique is suitable for computer‐controlled operation and could easily be applied to other standard specimen geometries.