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Strain-rate-dependent cohesive zone modelling of charge damage behavior when a projectile penetrates multilayered targets

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Abstract

The high impulsive overload when a projectile penetrates multilayered targets affects the performance of explosive charge, which is an important component of many weapons. A tensile stress wave is generated in the charge when the compressive stress wave is reflected from the free surface, which is the main reason of the damage occurrence. Here, the damage behavior of charge under the multiple high impulsive overloads is systematically studied by a strain-rate-dependent cohesive zone model. Therein, a critical δn (normal separation) is determined to describe the macrodamage evolution of charge by contrasting the predictions with the experimental results. Our numerical results show that the δn at the edge of charge is larger than that in the interior and that the angle between the macrodamage area and the transversal direction increases with the targets obliquity. It is found that the maximum δn and the macrodamage proportion during oblique penetration are larger than those during normal penetration. With the increase in the projectile velocity, the maximum δn and the total macrodamage proportion increase, and severe macrodamage area is closer to the tail. As the targets spacing expands, both the maximum δn and the total macrodamage proportion change non-monotonically, while the distance from the severe macrodamage area to the tail expands.

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Acknowledgements

The authors wish to thank two anonymous reviewers for their helpful comments. This work was supported by Opening and Collaboration Renovation Fund of Xi’an Modern Chemistry Research Institute (Grant no. SYJJ41). Zhu also acknowledges the National Natural Science Foundation of China (Grant no. 12072317).

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Authors and Affiliations

  1. School of Mechanical Engineering, Tianjin University, Tianjin, 300354, China

    C. Bi, X. Guo & A. H. Wang

  2. Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin, 300072, China

    X. Guo

  3. Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ, 08903, USA

    G. J. Weng

  4. Xi’an Modern Chemistry Research Institute, Xi’an, 710065, China

    K. P. Qu & F. Shen

  5. Department of Engineering Mechanics, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, 310027, Zhejiang, China

    L. L. Zhu

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Bi, C., Guo, X., Wang, A.H. et al. Strain-rate-dependent cohesive zone modelling of charge damage behavior when a projectile penetrates multilayered targets. Acta Mech 234, 2869–2887 (2023). https://doi.org/10.1007/s00707-023-03541-2

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