Abstract
In this paper, the digital photoelastic technique was employed to investigate the effect of different material combinations and different crack inclination angles on the stress-intensity factors (SIFs). To produce a true bimaterial plate,the two component materials were naturally adhered together by a special casting procedure. The experimental results show that dimensionless combined SIF increases with increasing G 1 /G 2 (or crack inclination angles) for different crack inclination angles (or G 1 /G 2 's).