Time-dependent fracture of epoxy resin under mixed-mode I/III loading

Improvement of Mixed-Mode I/II Fracture Toughness Modeling Prediction Performance by Using a Multi-Fidelity Surrogate Model Based on Fracture Criteria

“…as Also of interest is the generalized maximum tangential stress criteria (GMTS) [ 11 , 12 ], which focuses on the tangential stresses at the crack tip, and the average strain energy density criteria (ASED) [ 13 , 14 ], which focuses on the strain energy density around the crack tip, and the generalized maximum energy released rate criteria (GMERR) [ 15 ], which concerns the strain energy release rate around the crack tip etc. The fracture criteria serves as an excellent indication of the fracture of the material, but sometimes the specific value of fracture toughness obtained from the fracture criteria is quite different from the actual fracture toughness, as seen in the previous work of Poapongsakorn et al [ 5 ], which describes the time-dependence of epoxy resin that was found in the elementary fracture toughness from criteria clearly different from the actual fracture toughness value.…”

“…For the majority of engineering parts, the load pattern or direction is more likely to occur in a mixed direction than in just one direction. According to the nature of the load direction on that part, it must be studied in a mixed-mode fracture toughness; either it is studied in mixed-mode I/II [ 2 , 3 ], mixed-mode I/III [ 4 , 5 ], or mixed-mode II/III [ 6 , 7 ], with mixed-mode I/II loading being popularly studied in various research. The fracture toughness values under mixed-mode loading can be calculated under several methods such as actual testing, numerical method, etc.…”