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    Influence of the Geometry on Unstable Crack Extension and Determination of Dynamic Fracture Mechanics Parameters

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    The dynamic fracture toughness of the high-strength steel VCN-100 (UNI 38 NiCrMo4) is derived from tests on TPB 9 (three-point-bend) specimens. A wide range of crack velocities was obtained by changing the ER (energy ratio) of the specimen at crack instability; the crack velocity was evaluated from load versus time records during crack propagation. The results show a dependence of KID on crack velocity in good agreement with literature data.


    crack propagation, dynamic properties, fracture strength, fractures (materials), fast fracture, energy ratio (geometry), velocity, bending, high strength steels, fracture properties

    Author Information:

    Angelino, GC
    Head, Materials Engineering Section, Mechanics Division, Centro Informazioni Studi Esperienze, Segrate Milano,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27400S