A MODIFIED DOUBLE CANTILEVER BEAM MODEL FOR DETERMINING K_(Ic)

A modified model of double cantilever beam in determining K_(IC) has been pro-posed. In our model the behaviour of the double cantilever beam specimen ischaracterized by a constant stress intensity factor on condition that cracks in thespecimen propagate under constant displacement conditions. Results obtained froma 4340 steel appear to be in reasonable agreement with the established data.