Analysis of Mixed-Mode I/II/III Fracture Toughness Based on a Three-Point Bending Sandstone Specimen with an Inclined Crack

The crack-propagation form may appear as an arbitrary mixed-mode fracture in engineering structure due to irregular internal crack. It is of great significance research the materials with cracks. coupling effect multiple variables (crack height ratio, horizontal deflection angle and vertical angle) on parameters such stress intensity factors T-stress are key points this paper. A three-point bending specimen inclined crack was proposed used conduct research. were obtained by finite element analysis, computed results showed that pure mode I fractures (mode I/II, I/III I/II/III) can be realized changing angles toughness sandstone a series experiments. experimental analyzed generalized maximum tangential strain energy density factor criterion considering T-stress. non-singular term cannot ignored any research, better predict than other criteria.