Study on Explosive Disconnection Effect of Titanium Alloy Plate

The simulation test of blade loss in an aero engine plays a crucial role in casing containment design. The main challenge lies in controlling the breaking of rotor blades when they reach their maximum allowable speed. To investigate the optimal separation structure for rotor blades with artificial separation, two types of TC4 titanium alloy plates with Ⅴ-shaped grooves, one with a single hole and another with double holes at the center, were designed using explosive separation method. The selected size for the TC4 titanium alloy plate was 100 mm×80 mm×23 mm. The AUTODYN numerical simulation software's Smoothed Particle Hydrodynamics(SPH) algorithm was employed to conduct simulation calculations. Experimental comparisons were made on the damage and additional kinetic energy caused by five different schemes involving these two structures. Results indicated that scheme Ⅱ and Ⅴ failed to break off successfully, while scheme Ⅲ resulted in significant damage to the template. On the other hand, schemes Ⅰ and Ⅳ demonstrated better ability to separate the template. Under identical charge conditions, it was observed that the displacement of double-hole structured plates after fracture was significantly greater than that of single-hole structured plates with Ⅴ-grooves on both sides. Further analysis revealed that the Ⅴ-shaped slotted structure could reduce plate damage, enhance explosive energy efficiency, and minimize additional kinetic energy exerted on the plate. Moreover, compared to double-hole structures, this slotted structure also reduced peak speed by 20% and escape speed by 40%.