Abstract
Composed of metallic layers and composite plies, fiber metal laminates (FMLs) combine inherent advantages of metals and composites. The phenomenon of anomalous response behavior, in which the permanent deformation is in the opposite direction to the incoming pressure wave, has been discovered in dynamic responses of monolithic plate subjected to impulsive loading. In this study, dynamic responses of FML plates of various configurations are examined and compared against the responses of a monolithic plate using finite element analysis. It is found that under the load condition in which an anomalous dynamic behavior of an aluminum plate is observed, FMLs oscillate a few cycles before resting on permanent deformation, and the laminate thickness strongly affects the final deflection, which could be in the counter-intuitive direction or near the initial position of zero deflection depending on configuration and specification of FMLs. In addition, interaction of damage accumulation with deflection responses is investigated. The findings of this study can be useful for optimal design of FMLs intended for usage under extreme loadings.
Highlights
Composite materials are composed of two or more different substances, each with its own characteristics, combined to achieve superior properties than the constituent materials (Lapczyk and Hurtado, 2007; Guo et al, 2021)
Fiber-metal laminates (FMLs) are made of thin metal layers alternating with composite layers having a unidirectional, cross-ply, or fabric structure (Vasiliev and Morozov, 2018)
A primary goal of this study is to investigate the anomalous dynamic response that is highly sensitive to the applied loads, the load function is of critical importance
Summary
Composite materials are composed of two or more different substances, each with its own characteristics, combined to achieve superior properties than the constituent materials (Lapczyk and Hurtado, 2007; Guo et al, 2021). Active research on the dynamic behavior of composite materials includes rate dependence of mechanical properties (Wang et al, 2021), constitutive models (Zhan et al, 2021), damage evolution such as shear softening upon dynamic loading (Tang et al, 2017), and etc. Fiber-metal laminates (FMLs) are made of thin metal layers alternating with composite layers having a unidirectional, cross-ply, or fabric structure (Vasiliev and Morozov, 2018). FMLs combine advantages of fiber-reinforced composite materials and metals, possessing high specific strength, fatigue resistance, and excellent impact resistance (Andrew et al, 2019; Nicolinco et al, 2021). A particular important application of FMLs is using them in conditions that involving severe and extreme loads to absorb energies (Sasso et al, 2019; Jia et al, 2021). One category is the study of projectile impacts, including FMLs under low-speed and high-speed projectile impacts (Lee et al, 2018; Li et al, 2018; Sharma et al, 2021), multiple impacts with the same total energy (Yao et al, 2019), the influence of projectile deformability (Sangsefidi et al, 2021), and etc
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