Abstract
In this work, a new hybrid computational and experimental method is proposed which can be used to extract the dynamic fracture parameters in engineering materials at high loading rate. Torsional Hopkinson Bar is used to load an aluminum spiral notched specimen in mode I fracture configuration at different loading rate. A tubular specimen with spiral crack at 45° made of Aluminum 6061-T6, was used for the experiment. Using the experimental measured torque value as input computation analysis is performed to identify the dynamic initiation fracture toughness of the material. For the computational analysis, finite element is implemented in Abaqus. The result show that the dynamic stress intensity factor is loading rate sensitive, giving \( {K}_{Ic}^d\cong \left(1.2\mp 0.2\right){K}_{Ic}. \) The crack initiation time is also influenced by the rate of loading.
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