Three different solutions for orthotropic, beam-like fracture specimens were compared
in the current work. A beam theory-based approach was developed previously by the
author. Another solution based on refined plate theory was also considered. Finally
equations based on a numerical calibration technique were utilized as a third solution.
These solutions were extended for the case of composite double-cantilever beam, end-loaded
split and single-cantilever beam fracture specimens. For the double-cantilever beam
all the three solutions give reliable expressions. In contrast for the end-loaded
split and the single-cantilever beam coupons the three models give quite distinct
results, especially for the mode ratio of the single-cantilever beam specimen.