| Citation: |
ZHANG Zhengwei, LI Hui, LI Zelin, et al. Finite element modeling analysis and verification of fiber-reinforced origami sandwich plates with shear-hardening materials under high velocity impact[J]. Acta Materiae Compositae Sinica.
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This study aims to investigate the high velocity impact resistance characteristics of fiber-reinforced origami sandwich plates by adopting a combination of theory and experiment. First, based on the ABAQUS software and comprehensively considering the constitutive relationship and material characteristics of the plates and core layer as well as different failure criteria of various materials, a finite element model for high-speed impact of this new sandwich structure was created, and the solutions for key impact parameters such as structural impact area and residual velocity of the projectile were obtained. Further, by employing the data, such as the damage mode and damage area of such a structure, and the residual velocity and critical velocity of the projectile obtained from literature and experiments, the effectiveness of the developed finite element model and its prediction results were proved. It can be found that the composite plates of such a structure will happen to the problems with high velocity impact, including fiber tearing, fiber delamination, and matrix rupture. Also, the origami core layer will rupture and separate from the panel material. However, by comparing the residual velocity curves of the projectile at different initial velocities, it can be known that the embedded shear-hardening materials can well improve the impact resistance of the structure.
Origami sandwich structures are widely used due to their excellent mechanical performance. However, such structures are vulnerable impacted by foreign objects in practical engineering . Therefore, how to improve the impact resistance of origami sandwich structures has become one of the key problems that researchers urgently need to solve. Shear-hardening materials are a type of non-Newtonian fluid with reversible energy absorption and viscous energy dissipation capabilities. The impact resistance and energy absorption characteristics of the origami sandwich structures can be improved by embedding shear hardening materials, which enhances the protection of the structure. the protective capacity of the structure. In this paper, based on the ABAQUS software, modeling analysis and verification studies on the high-speed impact characteristics of fiber-reinforced origami sandwich plates with embedded shear-hardening materials (hereinafter referred to as FROSP-SHM) are carried out.
The finite element model of the FROSP-SHM under high speed impact is created by using ABAQUS software. The improved 3D Hashin failure criterion, the improved Christensen failure criterion and the BK mixed damage criterion are respectively applied to the middle layer, core layer and adhesive layer of the FROSP-SHM, which realizes the solution of the key impact parameters such as the structural impact damage area and the remaining velocity of the projectile. By comparing the critical velocity and the penetration failure diagram obtained from the literature data and the calculations of this model, the correctness of the finite element model is preliminarily verified. Finally, the preparation process of the FROSP-SHM specimens is proposed. Based on preparing three specimens, a high-speed impact experimental system of the FROSP-SHM specimens is established, and test studies are carried out at different high-speed impact velocities. By comparing the data such as the structural damage modes, damage areas, residual velocities of the projectile, and critical velocities obtained from the tests and calculations, the validity of the created finite element model and its prediction results are proved.
(1) The critical velocity of the FROSP-SHM structure calculated by the current model in this paper is 108.23 m/s. Compared with the critical velocity of 98.5 m/s obtained from the literature, the calculation error is 9.88%, which preliminarily verifies the validity of the current model.(2) Compared with the test results, the maximum errors of the current model in calculating the damaged area, the residual velocity of the projectile, and the impact critical velocity of the FROSP-SHM structure are 5.51%, 8.25%, and 3.18% respectively, and the impact damage modes calculated are also basically consistent with the test results, further proving the validity of the model and its prediction results.(3) Through the verified model, the influence of embedding shear-hardening materials on the residual velocity of the sandwich structure is analyzed and compared. It can be seen that the impact critical velocity can be increased by 11.8%,, which proves that embedding shear-hardening materials inside the core can indeed improve the ability of the FROSP-SHM structure to resist high-speed impact damage.(4) Under the high-speed impact of the projectile, the upper and lower composite face sheets of the studied structure can be observed fiber tearing, delamination, and matrix cracking. The origami sandwich can rupture and separate from the face sheets, and the area damaged by the impact is basically circular. In addition, the experimental results show that the self-healing adhesion performance of the shear-hardening materials can prevent the generation of composite fragments and make the structure have better containment ability.Conclusions: In this paper, a finite element model of the FROSP-SHM structure under high-speed impact is created. Through the results such as the structural damage modes, damage areas, residual velocities of the projectile, and critical velocities obtained from the literature and experiments, the validity of the developed model is proved.The proposed modeling and analysis methods can also predict the high-speed impact resistance of various types of sandwich structures such as lattice pyramid, honeycomb and foam embedded in shear hardening materials.
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