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Predicting the dynamic fracture of steel via a non-local strain-energy density failure criterion.
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2014-06-01
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Abstract:Predicting the onset of fracture in a material subjected to dynamic loading conditions has typically been heavily mesh-dependent, and often must be specifically calibrated for each geometric design. This can lead to costly models and even
costlier physical testing. In response to this, a failure criterion was created based on the strain energy density (SED) of the
material. Calculations to obtain the SED were developed to take advantage of a non-local length scale, wherein the sensitivity
to mesh density was partially reduced. This method was applied to a steel coupon subjected to dynamic uniaxial tension. A
one-time calibration was used to determine the material’s critical SED in the non-local length scale. This length scale was
dependent on the mesh density of the model and a prescribed magnifier, such that the failure criterion was a function of the
length scale. Steel coupons were modeled and tested dynamically. Thicknesses of those coupons were varied and stress
concentrations were included. Differing grades of steel were also employed. The non-local SED failure criterion provided
consistent and accurate predictions, regardless of the changes in dimensions of the coupons.
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