Cu-Nb　nano-layered　material　was　produced　through　an　accumulative　roll　bonding　(ARB)　technique.　Using　this　technique,　two　different　rolling　schedules　were　employed　to　produce　a　normal　and　transverse　rolled　material.　This　resulted　in　specimens　with　differing　microstructures　within　the　135nm　thick　nano-layers　and　interface　structures　between　the　layers.　The　dynamic　response　of　these　bulk　Cu-Nb　nanocomposites　was　then　investigated　under　planar　shock　loading.　It　was　observed　in　dynamically　fractured　specimens　that　the　characteristics　of　ductile　failure　features　formed　on　the　fracture　surface　after　dynamic　loading　were　dependent　upon　the　processing　route　of　the　nanocomposite.　Specifically,　grain　shape　differences　due　to　dissimilar　rolling　passes　are　linked　with　differences　in　the　failure　response,　particularly　kinetics　of　fracture.　In　addition,　incipient　failure　immediately　below　the　primary　fracture　surface　was　also　observed.　Numerous　nanovoids　were　nucleated　and　aligned　linearly　in　the　middle　of　Cu　layers　within　the　shocked　Cu-Nb　nanocomposites.　These　observations　indicate　relative　stability　of　Cu-Nb　interfaces　produced　by　the　ARB　methods　utilized　in　this　study　under　dynamic　loading　conditions.　©　(2014)　Trans　Tech　Publications,　Switzerland.