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Numerical Simulation of Ultrasonic Surface Treatment
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A dynamic model of ultrasonic surface treatment was developed to describe how the microplastic strain accumulates as dislocations redistribute and new defects form during ultrasonic peening. The model links microscale dislocation behavior to the macroscopic residual stress and hardening introduced by the treatment, useful for optimizing surface strengthening processes.
A dynamic model for the behavior of uitrasonically treatment materials is suggested.The microplastic strain piling up is related to the redistribution of the available defects and emergence of new ones on the microscale level as well as to the evolution of the available substructures and formation of new ones on the mesoscale level.The behavior of mild steel specimens subjected to ultrasonic shock wave treatment and to machining where the ultrasonic vibrations are applied directly by concentrator or magnetostrictive converter has been evaluated.The rQults obtained are reported.
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Ultrasonic treatment was found to create a hardened surface layer about 100 µm thick in dislocation-free silicon single crystals, accompanied by point-defect pileups at the surface. The results suggest that ultrasound activates surface defects that block dislocation motion, offering a potential method for surface strengthening of silicon components.
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