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SENSITIVITY ANALYSIS OF THE DOUBLE CLIP GAUGE METHOD
Author(s) -
Manzione P.,
Ipiñta J. E. Perez
Publication year - 1991
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.1460-2695.1991.tb00722.x
Subject(s) - sensitivity (control systems) , gauge (firearms) , crack tip opening displacement , position (finance) , rotation (mathematics) , structural engineering , fracture (geology) , fracture toughness , mechanics , materials science , geometry , mathematics , fracture mechanics , physics , engineering , crack closure , composite material , metallurgy , finance , electronic engineering , economics
During fracture toughness testing, the stable crack growth measurement is necessary for the construction of the R‐curves of J vs Δ a or CTOD vs Δ a . One possible measurement technique uses the Double Clip Gauge Method, which is based on the assumption that the specimen is deformed like two rigid arms that rotate around an apparent centre of rotation located in front of the crack tip. This apparent centre moves as the crack grows in a stable way, and its position can be estimated through the measurement of two crack opening displacements located at different heights. As a consequence the crack growth can be calculated. In this paper the behaviour of the equations that govern the Double Clip Gauge Method are described, and the zones of greatest sensitivity for the location of the clip gauges are determined. A sensitivity analysis of the most influential intervening variables is also made.