射孔枪毛刺和胀枪及其应力强度三维仿真

To obtain the dynamic stress distribution law of perforating gun,accurately analyze the bulging degree and the height of burr overpronation, taking the combination of 7"×12.65 mm TP140 casing and 5"×11.00 mm 32CrMo4 perforating gun as an example, a three-dimensional finite element model of the perforator-perforating gun-sleeve (including blind hole) was established by using LS-DYNA software. The ALE method which the grid was not fixed, not attached to the particles, and could have arbitary motion relative to coordinate system.With the operator separation algorithm, the detonation process, the solid-state flow conversion of the drug mask, the large deformation and fluid-solid coupling simulation of the high-speed jet penetration into the casing were realized. The results show that the perforating gun produces a 4.3 mm convex burr, the casing outer wall generates a 1.8 mm convex burr, and the cumulative burr height between the holsters is 5.2 mm. If the gap is close to or less than 5.2 mm, the accident occurs easily. The average diameter of perperforating gun is Φ18.7 mm, the average hole diameter of the casing is Φ7.7 mm, which shows that the process of blind hole drilling through the transmissive hole consumes a lot of energy, the design of blind hole wall thickness should be paid attention to. In the 125 mm wide band connected to the holes of the perforating gun, the minimum stress reaches 774 MPa, which exceeds the yield strength of the material, so under high detonation pressure, the outward bulge occurs, namely, the 'bulging gun' happens.