Numerical simulation of powder compaction for two multilevel ferrous parts, including powder characterisation and experimental validation by Tweed, J, Federzoni, L, Rau, W, Coube, O, Cocks, A, Skoglund, P, Haggblad, H, Oldenburg, M, Wiedemann, H, Gethin, D, Virta, J, Martikainen, H, Frachon, A, Doremus, P, Imbault, D, Grp, P