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Determination of SIFs, crack‐tip coordinates and crack angle of anisotropic materials
Author(s) -
JU S.H.,
CHIU C.Y.,
JHAO B.J.
Publication year - 2010
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.1460-2695.2009.01414.x
Subject(s) - anisotropy , stress intensity factor , displacement (psychology) , crack tip opening displacement , displacement field , materials science , mode (computer interface) , mixed mode , finite element method , fracture (geology) , stress field , geometry , fracture mechanics , mechanics , structural engineering , mathematics , engineering , composite material , optics , physics , computer science , psychology , psychotherapist , operating system
This paper investigates the accuracy of a numerical method incorporating an image‐correlation experiment for finding the crack‐tip coordinates, the axes of the measurement and the mixed‐mode stress intensity factors (SIFs) of anisotropic materials. Finite element and experimental simulations in this paper indicate that the proposed linear search method incorporating Powell's method is considerably stable for finding the unknown crack‐tip coordinates and measurement axes, even though the initial input is far away from the actual data. Moreover, the displacement field very near the crack tip is not necessary. In the experimental validation, the maximum SIF error of the image‐correlation experiment is about 9%, which should be acceptable for the mixed‐mode fracture problems.