Abstract
A three-dimensional multiparticle finite element method(3D MPFEM) model of laser shock compaction powder was established, and the forming process and densification mechanism of dynamic compaction were studied. The effects of the laser peak pressure(1–5 GPa) on the powder density was studied. The compaction density increased with the laser peak pressure and reached the highest at 5 GPa. A comparison of the different energies of the system revealed that the increase in powder temperature was mainly due to the plastic deformation. In the process of powder springback, large pressure can induce rebound, and the powder may produce an interparticle separation phenomenon due to the difference in particle velocities in different layers. Analysis of the densification process of the inner particles, revealed that the upper layer particles undergo first plastic deformation, and then the second plastic deformation occurs due to the inertia effect, which contributes to the improvement of the powder density. • 3D MPFEM was used to simulate the laser shock powder dynamic compaction process. • Adiabatic temperature rise effect is related to powder plastic deformation. • Laser shock powder has springback phenomenon and large strain rate.
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