Pre-compression of bolton rail-launcher

Large electromagnetic force is put on rails of the Rail-Launcher, and the encapsulation of the launcher is always preloaded for caliber control and ablation avoidance. For one launch instrument, the caliber change under different pre-compression with bolt was calculated in 3-D coupling field, based on which some experiments were carried out. The result shows that the launch without ablation could be realized if the caliber change percentage is limited within 0.61%.