Crack tip displacement fields measured by digital image correlation for evaluating variable mode-mixity during fatigue crack growth

The assessment of mixed-mode fatigue is an actual object of research. Various hypotheses have been published with the focus on calculating equivalent stress intensity factors and on predicting kink angles after a change of mode-mixity from one cycle to the next. Relatively few works are known for cases when the mode-mixity changes continuously during the fatigue cycles. Such investigations on determining equivalent stress intensity factors and...