Premium
FATIGUE CRACK CLOSURE MEASUREMENTS ON 2024‐T3 SHEET SPECIMENS
Author(s) -
Yisheng W.,
Schijve J.
Publication year - 1995
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 - 10.1111/j.1460-2695.1995.tb00916.x
Subject(s) - closure (psychology) , materials science , crack closure , structural engineering , composite material , fracture mechanics , engineering , economics , market economy
A computer‐controlled procedure has been developed for automatic measurement of the crack opening stress S op during fatigue tests. A crack opening displacement gauge (COD meter) is used to obtain digital data on the load versus COD curves. Three methods for deriving S op from the data sets are compared (1) a slope method, (2) a tangent lines intersecting method, and (3) a tangent point method. The effect of the position of the COD meter with respect to the crack tip on S op is studied in tests of 2024‐T3 specimens. Results of crack growth and S op are presented for CA loading with an overload, and with an overload followed by an underload.