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.

中文翻译：

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电磁轨道发射车G10绝缘子脱层失效分析

电磁（EM）轨道发射器G10绝缘子在发射过程中容易出现分层损坏，影响绝缘子的使用寿命。通过ABAQUS®商业有限元软件的二次开发，建立了考虑弹-身管耦合的电磁结构耦合发射动力学模型。仿真表明，弹丸的横向摆幅呈类正弦规律变化，上半波的时间对应于冲击力脉冲波形的脉冲宽度。接触冲击发生处的绝缘子内表面会产生应力集中，造成冲击损坏。绝缘子内表面中线在预紧力的作用下承受较大的压应变，在发射时钢轨时变载荷的影响下绝缘子被压缩而振荡。在反复发射的情况下，发射包反复冲击绝缘子，钢轨的交变载荷循环加载在绝缘子上，产生冲击损伤，会引起绝缘子的压缩疲劳和冲击损伤裂纹的扩展。它们是造成绝缘子分层失效的主要原因，并进行了实验分析。该研究为研究绝缘子分层失效机理提供了方法，为提高绝缘子寿命提供指导。