To better dissipate impact energy with less solid fraction, shocked metallic foam responses have been studied with different spatial discretization methods at different scales. Molecular dynamics (MD) and the finite element method (FEM) are representative discrete particle and continuous methods, respectively. The Material Point Method (MPM) is a continuum-based particle method that is formulated based on the weak form of the governing equations in a way like the FEM. A challenging task is how to verify and validate multiscale shock responses because impact experiments are limited in spatial nanoscale while nanoscale experiments are limited in high loading rates. Based on the recent research results [Saffarini et al., 2023; Su and Chen, 2023], we are performing a comparative study of shocked metallic foam responses with both MD and MPM to understand the porous interfacial effect on failure evolution in shocked metallic foam assembly. Essential features of the responses at the same spatial scale as obtained with both discretization procedures will be presented in the conference for a representative composite system. It appears from the investigation that the MD and MPM solutions are consistent at the same scale. Thus, it might be feasible to compare the MD and MPM solutions for verification in multiscale simulation of shock responses while the verified MPM solutions could be validated against macroscale impact experiments. In addition, the porous interfacial effect might produce the failure evolution like the failure wave phenomenon as observed in shocked brittle solids [Kanel et al., 2005]. Future work will be performed to improve the proposed verification and validation procedure for better Pevaluating multiscale responses of shocked metacomposites via particle methods. REFERENCES Kanel, G.I., Razorenov, S.V., Savinykh, A.S., A. Rajendran, and Chen, Z., “A Study of the Failure Wave Phenomenon in Glasses Compressed at Different Levels,” Journal of Applied Physics, Vol. 98, pp. 113523-113530, 2005. Saffarini, M., Sewell, T., Su, Y., and Chen, Z., “Atomistic Study of the Impact Response of Bicontinuous Nanoporous Gold as a Protection Medium: Effect of Porous-Nonporous Interface on Failure Evolution,” Computational Materials Science, Vol. 228, No. 112363, 2023. Su, Y., and Chen, Z., “Study of the Shear-band Evolution across the Interface between Different Spatial Scales,” accepted for publication in Computational Particle Mechanics, 2023.