In a multi-layered, pre-made fragment warhead, the interaction between the detonation waves from the explosive and the pre-made metal fragments results in the separation of the fragments from each other. This paper aims at understanding the mechanism behind the multi-layered fragment separation by studying the propagation of shock waves through the fragments and taking into account the finite strength of the fragments at such high strain rates. By analyzing the forces that act on the fragments, we can better understand the role of the different forces that act on the fragments. A numerical approach is used to simulate the multi-layered fragment separation using spherical fragments keeping the C/M ratio constant. A single column of fragments is modelled and simulated for 2, 3, 5 and 7 layers of fragments. © 2019 by International Ballistics Society All rights reserved.