Process zone and size effect in fracture testing of rock

Size effect, material ductility and shape of fracture process zone in quasi-brittle materials

“…(2), a linear relationship should be expected. From this plot, the K IC value corresponding to very large specimens (1/D equal to zero) is obtained [11,12]. The effect of specimen size and material ductility on the apparent fracture toughness is shown in Fig.…”

“…In a previous study, Fakhimi and Tarokh [12] proposed the following equation for the change of width (W) of the process zone with the specimen size:…”

Fracture process zone and tensile behavior of blended binders containing limestone powder

“…In this study, the FPZ is considered to have terminated, along the direction of crack propagation, when the local strains are less than 25% of the maximum strain at the tip of the notch. As in the case of FPZ width, the FPZ length also is a function of specimen size and geometry [13,[49][50][51]55]. Fig.…”

“…It has been shown that the width of the FPZ is a function of the specimen size and the ratio of notch depth-tospecimen depth [49][50][51] and thus the quantifications presented should be considered as applicable only to the specimen geometry used in this study. However, qualitatively, the results are consistent for these binder material formulations, independent of the geometry that is considered.…”

A New Criterion for Rupture Assessment of Rubber‐Like Materials under Mode‐I Crack Loading: The Effective Stretch Criterion

“…[29] For brittle materials, plasticity is limited or non-existent and damage can be observed in the form of microscopic cracks, crazing, and so on. This localized damage region, often called the damage or process zone, [30,31] no longer sustains any stresses and hence, fracture initiates from its boundary. [32] Similar to brittle materials like rocks and glasses, the existence of crack tip damage zone in rubber-like materials has also been reported.…”