6 good ductility. Those properties can be obtained by combining a fibre-reinforced composite and a metal [2, 3]. 2. Literature review and problem statement It is very common that structures work under dynamic loads, and they are rare to be subjected to static loads. If there are defects such as cracks in a material of the structure loaded under dynamic loads, the cracks may propagate to its critical length, which endangers the safety of the structure. The crack propagation caused by the dynamic load may also occur on the composite materials such as FMLs [2]. The crack propagation taking place in the FMLs is associated with the delamination occurring over the crack region behind the crack tip [4, 5]. Although the crack propagation behaviours on FMLs have been well known, and it has been known that the crack propagation is similar to the monolithic metal [2-6]. On the FMLs, the crack propagation is obgserved on the metal laminate but over the wake of the crack, the fibre composite is still intact causing fibre bridging on the wake, thus, it reduces the effective stress advancing the 6