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Influence of notch width and length on crack initiation in 3PB specimens
Seitl, Stanislav ; Klusák, Jan ; Keršner, Z.
The paper presents the influence of the various notch depths for the range of starting notch width on a crack initiation in three-point bending specimens. These specimens are the most frequently used for fracture laboratory testing, especially of quasi-brittle cement-based composites. It is shown that the values of fracture toughness obtained from the tests of specimens with larger widths with various length of the starting notch can be overestimated.

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