path (un)predictability of two interacting cracks in polycarbonate sheets using digital image correlation - transparent polycarbonate sheet
Here, the crack expansion is tracked through digital image correlation analysis, in the test case of two cracks expanding in the opposite direction in the pc, which is a material with high scalability and large fracture process area (FPZ).
Depending on the initial distance between the two crack tips, one may observe different complex crack paths, especially the state in which the two cracks are mutually exclusive before being attracted.
Through the strain field analysis, we show how to understand this according to the principle of local symmetry: the direction of propagation is local shear-
Mode KII in the language of fracture mechanicsis zero.
Therefore, the interaction shown by the crack comes from symmetry, initial geometry and material properties that cause FPZ.
This complexity makes any long-term
Range prediction of paths (s)impossible.