An effective means for evaluating mixed-mode I/III stress intensity factors using single-edge notch beam specimen

The main objective of this study is to produce a set of practical equations, by which one could evaluate mixed-mode I/III stress intensity factors by conducting a simple mode I single-edge notch bend specimen test as per ASTM D5054. To establish the proposed equations, a comprehensive finite element analysis is conducted to map the stress intensity factors' distribution through the thickness of the specimen with the aim of establishing the most effective loading condition for evaluating the mode stress intensity factors. An experimental investigation is also conducted to obtain the ultimate fracture load and establish the fracture mechanism under the mixed-mode loading state. A set of correction factors is also proposed, which accounts for the influence of orientation of the initial crack and the applied load on the stress intensity factors.