Research on the dynamic yield strength and forming depth of microscale laser shock imprinting

Abstract Metallic microstructure processing methods has been a significance topic for their widely applications in optoelectronics, machinery and other field. Ultrahigh-strain-rate forming induced by laser shock imprinting (LSI) has the characteristics of high precision, small scale and diversified material. The paper studied the forming micro-process and forming depth by theory and experiments, so as to realize the controllable forming of metallic microstructure by LSI. In the paper, deformation dynamic micro-process was obtained by numerical simulation, and the forming depth was investigated through LSI theory and experiment. Besides, Different strain rates will cause the change of material dynamic yield strength ( σ y , d y n ). The relationship between σ y , d y n and original yield strength ( σ y ) was established by numerical simulation, which compare with experiment results. Therefore, metallic microstructure controllable forming could be achieved by LSI.