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An analytical model is proposed for describing the influence of mixed dislocation on the acoustic nonlinearity in the plastically deformed materials, which is derived based on the dislocation line energy and variable line tension. Based on the proposed model, the interaction of nonlinear plane longitudinal wave with the plastically deformed materials was simulated in this article. The simulation was validated by the experimental measurement for the satisfactory consistency. Both simulation and experimental results reveal monotonically increasing tendency of the normalized nonlinear parameter with the plastic strain, which is mainly attributed to the dislocation evolution according to microscopic study

Effect of Mixed Dislocations on Nonlinear Acoustic Responses in Plastic Deformation Materials