Application of the size effect law to the determination of R-curves for transverse cracking in polymer matrix composite laminates using single edge notched bend specimens.

The R-curves for transverse cracking could be determined based on the size effect law using SENB specimens, where the R-curves determined by the size effect law were consistent with those determined by the compliance method. The crack growth resistance in the steady-state and the crack extension at the onset of the steady-state of carbon-fiber/epoxy laminates, T800S/2592, were determined to be 0.22 N/mm and 0.36 mm, respectively. The crack growth stability in SENB specimens depended not only on the load control method but also on the specimen geometry, whereas a unique R-curve could be obtained regardless of the crack growth stability. • The R-curve for transverse cracking in composite laminates was "experimentally" determined based on the size effect law. • The validity of the above method was not only theoretically predicted but also numerically and experimentally proven. • The R-curves obtained by the size effect law were demonstrated to be independent of the load control method. • The R-curves obtained by the size effect law were demonstrated to be compatible with those obtained by the compliance method. • A practical data reduction scheme was proposed to reduce the evaluation error in the size effect study. [ABSTRACT FROM AUTHOR]