Dynamic Response of Interior Ballistic Process and Rail Stress in Electromagnetic Rail Launcher

Zhang, Yongsheng; Liu, Junyong; Tan, Shiming; Bai, Li; Jiang, Yuanzhi

doi:10.1109/tps.2018.2887006

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Other scholars believed that the barrel dynamics, including the structural natural oscillation [18] as well as the repeated extrusion, friction [19] and deformation [20] of the rail, led to the cracking and delamination of G10 insulator. In summary, the current research on delamination damage of the insulator mainly focussed on the description and analysis of experimental phenomena, and scholars were generally concerned about the interaction between armature and rail during launch [21][22][23][24]. There is a lack of research on the delamination failure mechanism of the insulator during dynamic launching process.…”

Section: Introductionmentioning

confidence: 99%

Delamination failure analysis of G10 insulator in electromagnetic rail launcher

Liu

Tan

et al. 2023

High Voltage

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The electromagnetic (EM) rail launcher G10 insulator is prone to delamination damage during launch, which affects the service life of the insulator. Through the secondary development of ABAQUS® commercial finite‐element software, an EM‐structure coupling launch dynamics model considering projectile‐barrel coupling is established. The simulation indicates that the transverse swing of the projectile changes in a sine‐like law, and the time of the upper half wave corresponds to the pulse width of the impact force pulse waveform. The stress concentration occurs on the inner surface of the insulator where the contact‐impact occurs, resulting in impact damage. The midline of the insulator inner surface bears a large compressive strain under the action of pre‐tightening force, and the insulator is compressed oscillatingly under the influence of the time‐varying load of the rail during launch. Under the condition of repeated launch, the launch package repeatedly impacts the insulator, and the alternating load of the rail is cyclically loaded on the insulator with impact damage, which will cause the compression fatigue of the insulator and the expansion of impact damage crack. They are the main reasons for the delamination failure of insulator, and the experimental analysis is carried out. This study provides a method to study the delamination failure mechanism of the insulator, and provides guidance for improving the life of the insulator.

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Section: Introductionmentioning

confidence: 99%

Delamination failure analysis of G10 insulator in electromagnetic rail launcher

Liu

Tan

et al. 2023

High Voltage

Self Cite

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“…Owing to good development prospects and technical advantages, it is an important research direction in the field of electromagnetic launch. An electromagnetic track launcher can increase the armature to a high speed within tens of milliseconds, which leads to a relatively complex experimental environment, and the research is relatively dependent on numerical simulation calculation [4][5][6][7]. Therefore, in order to achieve further popularization and application, how to improve the calculated accuracy of the simulation model and achieve full true simulation calculation is the key issue to be solved at present.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Verification of Electromagnetic-Thermal Coupling for Electromagnetic Track Launch Considering the Dynamic Conductivity

Yan,

Jiang,

Yang

et al. 2023

Applied Sciences

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In order to solve the problems of insufficient precision of the armature velocity and inductance gradient in the process of finite element calculation of the electromagnetic track launcher, an improved dynamic conductivity electromagnetic-thermal coupling model is proposed to make the calculated results closer to the actual working condition. Firstly, the finite element analysis for the electromagnetic-thermal field is carried out. Then, considering the influence of dynamic conductivity on the armature velocity and inductance gradient, an improved dynamic conductivity electromagnetic-thermal coupling model based on finite element analysis is established, whose parameters are identified by the proposed PSO-GA hybrid algorithm. Moreover, the predicted values of armature velocity and inductance gradient are also obtained. Finally, the experimental platform of the electromagnetic track launcher is built to verify the improved model. By comparing the predicted value of the improved model with the experimental test value, it is found that the improved model can further reduce the calculated error from 5.79% to 1.18%, which provides a certain theoretical basis for the full true simulation of the electromagnetic track launch.

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