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- W2988698568 abstract "Fracture toughness testing at small scales is widely adopted for materials of limited size. Recent experimental results demonstrate that the fracture toughness of single-crystal tungsten decreases by half as the specimen size drops equally from the order of several dozen micrometers to 1 $ensuremath{mu}mathrm{m}$. To explore this size-dependent fracture feature, we construct a fracture model by combining the Griffith strength theory and elastic-damage law. It is shown that as the specimen scales down to a critical size, the fracture behavior changes from the fracture toughness domination to the strength domination, leading to a seeming decrease of the fracture toughness. Reviewing mechanical fracture testing of different brittle materials at small scales, we found that their fracture is dominated by fracture strength instead of fracture toughness, which explains why the reported values of fracture toughness obtained from the microscale testing are significantly less than the corresponding ones measured at the macroscale. Our study has profound guiding significance for the characterization of the fracture toughness at small scales." @default.
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- W2988698568 date "2019-11-11" @default.
- W2988698568 modified "2023-10-16" @default.
- W2988698568 title "Failure of fracture toughness criterion at small scales" @default.
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- W2988698568 doi "https://doi.org/10.1103/physrevmaterials.3.113602" @default.
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