Modeling the Effects of Grain and Porosity Structure on Copper Spall Response

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Journal of Dynamic Behavior of Materials

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Ongoing efforts to characterize the incipient spallation of copper have increased the experimental fidelity at which the material’s microstructure is measured. Various imaging techniques have allowed for 3D characterization of the structure of inclusions, porosity, and crystallographic grains. This work employs a combined crystal mechanics and porosity model that, for the first time, addresses the influence of three different types of spatial distributions of second phase particles, relative to features in both experimentally-measured and synthetically-generated microstructures. With these features, the model can probe the sensitivity of copper spall response to both grain and porosity structures. The sensitivity of the model to various nucleation and porosity growth parameters is also shown. These sensitivity studies illustrate where increased experimental accuracy can most readily affect modeling results. Likewise, the model’s fidelity captures many of the key features measured experimentally and is a step toward a model capable of predicting and improving the spall resistance in many materials.


Journal of Dynamic Behavior of Materials, Vol. 4, No. 4 (December 2018): 464-480. DOI.

John A. Moore was affiliated with Lawrence Livermore National Laboratory at the time of publication.