Abstract
The deformation and damage mechanism of shell structures under near‐field explosion loads has been of great significance in the theoretical study of impact dynamics and may serve as a dependable theoretic basis for the antiexplosion design of shell structures. In this paper, the plastic zone and crevasse size of clamped square plates under near‐field explosion loads were discussed based on the plastic hinge law and energy theory. The crevasse size of a plate moving at motion modes Ι and ΙΙ under medium load was obtained according to the ultimate plastic strain criterion. Furthermore, the plastic zone under a high load was determined in terms of the movement law of a plastic hinge line. When the applied load ended, the crevasse sizes of the plates at motion modes III and IV were deduced on the basis of the principle of energy conservation. Finally, numerical simulation was used to analyse the deformation and damage mechanism of the shell structures under near‐field explosion loads. The theory and method proposed in this paper are verified using ANSYS software and compared with the experimental results. This study verifies the validity of the proposed approach for analysis of the deformation and damage of a clamped square plate under near‐field explosion loads.
Highlights
Shell structures are widely used in naval vessels, aircraft, and tanks due to their special properties, such as simple construction, being light weight, and good bearing capacity [1,2,3,4]
Spranghers et al [12] proposed an inverse method that uses full-field optical measurements taken during the first milliseconds of a free air explosion to identify the plastic response of aluminum plates subjected to sudden blast loads, and the results verify that the proposed methods can be successfully used to analyse the plastic behaviour of metals subjected to blast waves
At first, the velocity field is in the form of a tetrahedral pyramid, the moving hinge line appears in the plate when the load suddenly disappears, and the hinge line moves to the centre of the plate; the top platform will gradually shrink until it vanishes
Summary
Shell structures are widely used in naval vessels, aircraft, and tanks due to their special properties, such as simple construction, being light weight, and good bearing capacity [1,2,3,4]. Houlston and Desrochers [11] calculated the dynamic plastic response of a clamped square plate subjected to blast loading by applying the ADINA procedure. Zheng et al [14] investigated the large deflection behaviour of clamped stiffened plates subjected to confined blast loads through experiments, theoretical analysis, and numerical simulations; it was proven that the proposed calculation model is of high precision and practicability by comparing the numerical results. Shock and Vibration principle to analyse and discuss the nonlinear dynamic response of a laminated composite plate subjected to blast load, and finite element results in the literature show good agreement with their approximate numerical analysis results. A theoretical analysis on the deformation and damage of clamped square plates under near-field explosion load is still limited and requires further study. E numerical simulation results are in good agreement with the theoretical analysis results, and the parameter correctness of various material models and state equations has been verified. ese studies have laid a foundation for the numerical simulation of explosion problems and provide theoretical guidance for practical applications
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