Deformation and failure of thin spherical shells under dynamic impact loading: Experiment and analytical model

Li, Jianqiao; Ren, Huilan; Ning, Jianguo

doi:10.1016/j.tws.2020.107403

Cited by 6 publications

(10 citation statements)

References 45 publications

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“…The radius and length of all the projectiles were 6 mm and 45 mm, respectively. The projectiles applied in this study were similar to what were used in our previous investigation [16] for shallow spherical shells under impact loads. The MatchID system was used to perform the 3D-DIC measurements for the timehistories of the dynamic response of the impacted ellipsoidal shells and to reconstruct the displacement distribution during the evolution of the ellipsoidal shell deformation.…”

Section: Specimens and Experimental Methodsmentioning

confidence: 99%

“…In our previous study [16], a theoretical model was proposed for spherical shells. The deformation mode in the spherical shell was very simple.…”

Section: Theoretical Investigationmentioning

confidence: 99%

“…Based on the experimental measurements, the deformation characteristics were determined. This made it possible to describe the displacement distribution in a clear and easy way similar to what was applied to a spherical shell in our previous work [16]. According to the proposed displacement distribution, the strain and curvature distributions were obtained by the local curved coordinates provided by the theory of fields.…”

Section: Introductionmentioning

confidence: 96%

“…A displacement mode was proposed for the edge region with a large deformation concentration, and the influence of the constitutive model was also discussed. Li et al [16] improved the displacement mode by considering the radial displacement and analyzed the perforation response of the impacted shell. In addition, the influence of parameters in the theoretical model on the deformation and perforation response of the impacted shell was discussed.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Deformation and Perforation of Ellipsoidal Thin Shell Impacted by Flat-Nose Projectile

Liu

2022

Materials

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Experimental and theoretical studies were carried out on the dynamic deformation and penetration response characteristics of metal ellipsoidal thin curved shells under impact loads. The deformation characteristics of the impacted ellipsoid shell was investigated via the use of a light gas gun to carry out impact loading experiments at different speeds. Ten cases of experiments were conducted with the impact velocities distributed between 25.69 m/s and 118.97 m/s. Stereo digital image correlation (3D-DIC) technology was applied to capture the dynamic deformation and penetration process of the impacted shell. The recovered shells were measured, and the deformation characteristics were analyzed, along with the dynamic evolution, as observed through 3D-DIC analysis. Based on the experimental results, the displacement mode was summarized and the displacement distribution of the locally impacted ellipsoid shell was proposed. The governing equations were derived for the dynamic deformation and penetration of the impacted ellipsoid shell by means of the Lagrange equation. The proposed theoretical model was verified based on the experimental results. Finally, the influence of the curvature distribution on the impact resistance of ellipsoidal shells is discussed. The results indicated that the proposed theoretical model was effective in analyzing the large deformation and the penetration speed. Stretching the axial length of the ellipsoid shell in the impact direction improved its resistance to penetration. Stretching the axial length of the ellipsoid shell perpendicular to the impact direction improved its resistance to deformation, but reduced its resistance to penetration. Maintaining the triaxial ratio and appropriately reducing the size of the ellipsoidal shell improved its resistance to both deformation and penetration. The above research provides a reference for the analysis of the impact resistance of thin-walled curved shell structures in engineering.

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Section: Specimens and Experimental Methodsmentioning

confidence: 99%

“…In our previous study [16], a theoretical model was proposed for spherical shells. The deformation mode in the spherical shell was very simple.…”

Section: Theoretical Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Deformation and Perforation of Ellipsoidal Thin Shell Impacted by Flat-Nose Projectile

Liu

2022

Materials

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“…The mechanism can be studied, though for specific geometries, by finite element simulation of impulsive loads on structures. 5 Impact and penetration analysis are essential for many engineering applications such as crash testing of structures and materials, [6][7][8][9] surface investigation, installing deep sea anchors, foundations. 10 Many aspects of impact mechanics have been addressed in recent literature.…”

Section: Introductionmentioning

confidence: 99%

Effects of spinning on residual velocity of ogive-nosed projectile undergoing ordnance velocity impact

Pranay

Panigrahi

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present article, finite element analysis (FEA) based simulation on the study of the impact of projectiles having ogive nose shape has been made using ANSYS explicit dynamics. The effects of spinning on the residual velocity of ogive nosed projectile undergoing ordnance velocity impact have been presented. The variations of residual velocity due to different projectile materials and target plate thickness have been evaluated when the projectile is impacted by translational and spinning velocity. The target plates and ogive nosed projectile of a given material are discretized, and a rigorous error and convergence study has been made. Subsequently, the residual velocity of the considered model is evaluated by numerical techniques based on FEA. The results with the optimized meshed model are compared with the analytical results using the penetration theory and found that the results are well compared. Parametric study of the residual velocity has been made with varied ogive nosed materials and target plate thickness when the ogive nosed projectile undergoing ordnance velocity impact. Based on the numerical results, it has been found that the ogive nose projectile having tungsten alloy material is more effective undergoing ordnance velocity impact compared to steel 4340 material. For a given target plate thickness, spinning velocity, and impact velocity, the residual velocity is about 3 percent higher for the projectile made up of tungsten alloy compared to the steel 4340. The effects of the target plate thickness on the residual velocity of the ogive nose projectile do not seem to have much significant effects. It may be due to the simple reason that the ratio of the target plate thickness to projectile diameter is remaining within the intermediate range, i.e. within 1 and 10.

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Characteristics and variation laws of electromagnetic radiation generated during explosion

Cui,

Jiang,

Kong

2023

Propellants Explo Pyrotec

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The characteristics and laws of explosive electromagnetic radiation must be clarified to investigate its interference with electronic equipment. Currently, studies pertaining to explosive electromagnetic radiation are performed via small equivalent explosive explosion tests, and conclusions regarding the regularity of electromagnetic radiation from warhead explosions are not confirmed. This study analyzes the power laws of explosion electromagnetic radiation via numerical simulations, literature comparisons, experimental testing, and other methods. The results show that the duration of the explosion electromagnetic radiation is proportional to the 1/3 power of the equivalent. The delay time is between 44 and 53 μs and is inversely proportional to the detonation velocity. The peak time is positively correlated with the 1/2 power of the equivalent. The electric field intensity of an explosive explosion is directly proportional to the 1/3 power of the equivalent, whereas the electric field intensity of a warhead explosion is positively correlated but not linearly related with the equivalent power. The spectral distribution of the electromagnetic radiation caused by different types of explosives differ significantly. The electromagnetic radiation measurement results for explosive explosions can be predicted via numerical simulation. However, the simulation results do not match the measurement data of warhead explosions, thus highlighting the necessity of warhead explosion electromagnetic measurements.

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Deformation and failure of thin spherical shells under dynamic impact loading: Experiment and analytical model

Cited by 6 publications

References 45 publications

Dynamic Deformation and Perforation of Ellipsoidal Thin Shell Impacted by Flat-Nose Projectile

Dynamic Deformation and Perforation of Ellipsoidal Thin Shell Impacted by Flat-Nose Projectile

Effects of spinning on residual velocity of ogive-nosed projectile undergoing ordnance velocity impact

Characteristics and variation laws of electromagnetic radiation generated during explosion

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