Dynamic mixed mode crack propagation behavior of structural bonded joints

The stress field around the dynamically propagating interface crack tip und er a remote mixed mode loading condition has been studied with the aid of d ynamic photoelastic method. The variation of stress field around the dynami c interface crack tip is photographed by using the Cranz-Shardin type camer a having 10(6) fps rate. The dynamically propagating crack velocities and t he shapes of isochromatic fringe loops are characterized for varying mixed load conditions in double cantilever beam (DCB) specimens. The dynamic inte rface crack tip complex stress intensity factors, K-1 and K-2, determined b y a hybrid-experimental method are found to increase as the load mixture ra tio of y/x (vertical/horizontal) values. Furthermore, it is found that the dynamically propagating interface crack velocities are highly dependent upo n the varying mixed mode loading conditions and that the velocities are sig nificantly small compared to those under the mode I impact loading conditio ns obtained by Shukla (Singh & Shukla, 1996a, b) and Rosakis (Rosakis et al ., 1998) in the USA.