Application of dislocation-based constitutive model into research of dynamic mechanical behavior under shock loading

To understand the plastic deformation mechanism of an FCC metal (pure aluminum) under shock loading and describe its dynamic mechanical behavior accurately, a multiscale constitutive model based on the dislocation substructure is developed, which comprehensively considers the controlling mechanisms...

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Bibliographic Details
Published in:AIP advances 2022-12, Vol.12 (12), p.125305-125305-13
Main Authors: Cheng, Wenyu, Pan, Hao, Dong, Jiaqin, He, Anmin, Hu, Xiaomian
Format: Article
Language:English
Subjects:
Aluminum
Amplitudes
Constitutive models
Decay
Deformation mechanisms
Evolution
Experiments
FCC metals
Mathematical models
Mechanical properties
Perturbation
Plastic deformation
Plate impact tests
Shock fronts
Shock loading
Shock waves
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Summary:To understand the plastic deformation mechanism of an FCC metal (pure aluminum) under shock loading and describe its dynamic mechanical behavior accurately, a multiscale constitutive model based on the dislocation substructure is developed, which comprehensively considers the controlling mechanisms of dislocation motion and dislocation evolution. Then, the model is extended to the loading of strong shock waves by incorporating the homogeneous nucleated dislocation within the constitutive framework. The model parameters are successfully determined by the normal plate impact experiments with different thicknesses of specimens. Additionally, shock front perturbation decay experiments are performed using a line velocity interferometer system for any reflector, where the modulated surface of the specimen is subjected to a laser-driven loading. Then, the model is applied to reproduce the perturbation decay of shock fronts in experiments. During the post-process of simulated results, the method based on the pressure gradient is used to determine the amplitude and the location of distributed shock fronts. The extended model shows promise as an effective method to figure out the role of strength (shear response) on the evolution of perturbation amplitude.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0099123