A Linear Shaped Cutting Device Failure Analysis Based On Finite Element

Since linear shaped cutting is a three-dimensional problem, and involved the explosive detonation, as well as the complex mechanical problems of materials under high temperature, high pressure and high strain, it is difficult to use traditional mechanical formula to describe this problems. Early studies of linear shaped is based on tests. With the development of computer technology and numerical analysis methods, numerical simulation has become an important method of research shaped charge.This papers is based on the linear shaped cutting products, which one side of the linear shaped charge can be detonated, but the other side can’t be detonated. The first, the cause of the product’s initiation failure is analyzed by using the numerical simulation, and found that a deflection angle of detonator has a great impact on detonation, and analysis the time that the two side LSC was detonated, and found the detonators energy distribution are not the same on the both sides, and when the deflection angle is greater than a certain angle, the side of LSC will not be detonated for lacking of energy, and the conclusion is verified by experiment.For the deflection angle is great than a certain angle, one side of LSC can’t be detonated, two improvements was made: First, the higher shock sensitivity explosive was used, which can reduce the required energy of detonation, can effectively solve the initiation failure of this product; Second, a higher shock wave impedance gasket was used, which can improve initiation energy, to some extent, can reduce the chance of detonation failure. And this improvements were verified feasible by experiments.A V-shaped charge was designed for the product, and its structure was optimized by using orthogonal optimization method, and designed appropriate tests to verify that its structures is reasonable. Compared with U-shaped charge, the jet of V-shaped charge is slender and with higher speed, and less charge weight at the same penetration depth, and smaller standoff, which can reduce the size of the produce.