# A Numerical Study of Blast Resistance of Carbon Fiber Reinforced Aluminum Alloy Laminates
## 1 Introduction  
The fusion of metal alloy and fiber reinforced composite material overcomes the limitation of metal and composite material alone, and is widely used in aviation and national defense fields as a protective structure. FML (fiber metal laminate) structures combine the high specific strength of fiber and the impact resistance of metal, so that the composite structure has the advantages of low crack growth rate, high toughness, low density, etc., and its impact resistance has become a popular research topic [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20]. This paper focuses on the study of CARALL (carbon fiber reinforced aluminum alloy laminate). In practice, [PERSON] [21] used high-speed ballistic impact test to analyze the anti-penetration performance of CARALL with flat, pointed, and round head projectiles, and used the method of defining a user subroutine in ABAQUS finite element software to more accurately describe the three-dimensional progressive damage model of carbon fiber. The results show that CARALL has excellent elastic resistance, especially for flat-headed projectiles. [PERSON] et al. [22] investigated the low-velocity impact behavior of FMLs consisting of carbon fiber reinforced layers and aluminum sheets under multiple impacts with the same total energy. The results revealed that multiple impacts with lower energy division and smaller initial impact energy can cause minor damage in FMLs. [PERSON]. [PERSON] [23] conducted high-speed impact simulation analysis of three types of CARALL, and compared the impact resistance performance of these CARALL laminates under different impact factors. In this paper, the deformation and energy absorption of specimens and the matrix damage, fiber damage, and bond delamination of materials are also compared and analyzed. The study shows that, for the same thickness, the alternating stratification of the CARALL layer is more important in controlling the deformation and the impact ability of each layer's injury. [PERSON] et al. [24] analyzed CARALL and GLARE laminates with different fiber arrangements and metal layer arrangements using the drop hammer method, and found that the generation andexpansion of cracks are mainly affected by the fiber arrangement direction. [PERSON] et al. [25] proved through bending tests that FMLs can endure higher bending strength along the fiber direction compared to FMLs with cross-ply layups. The above studies indicate that the number of fiber and metal layers, the direction of the fiber arrangement, and the order of the fiber and metal arrangement in FMLs play a crucial role in the impact resistance of FMLs. However, all of the above studies are based on planar FMLs structures or the mechanical properties of FML structures under quasi-static conditions [13; 26]. In the research background of this paper, the protective structure is a curved structure. Due to the structural characteristics, there are many differences between the deformation failure modes of FMLs under quasi-static conditions for curved structures and planar structures. There are only a few studies of such structures in the existing literature. [PERSON] et al. [14] used a shock tube device to simulate the effect of explosion shock on fiber composite structures with different radii of curvature. The results show that the change in curvature will greatly affect the reflection and slip of the blast shock load on the panel, and the failure mode of fiber will also change. [PERSON] [15] simulated the response characteristics of CARALL under explosive load by establishing a double-layer CARALL curved composite plate and adopting CONWEP loading mode in ABAQUS. The results show that, with the decrease in the curvature radius, CARALL's absorption of explosion energy decreases, the fracture, delamination, and buckling fold of fiber decrease, and the sag deformation and displacement of the aluminum alloy part decrease. It is believed that the reduction in the curvature radius is beneficial to improving the explosive impact resistance of CARALL.