Numerical Study on the Explosive Separation of Pyrotechnic Cutter

et al. 2023

J. Phys.: Conf. Ser.

Pyrotechnically actuated devices(PADs) rely on combustion of energetic materials to achieve various functions and are widely used in aerospace fields. In this paper, based on the basic principle of the PADs, a piston-type water inlet device is designed, which can make underwater weapon sink into the seabed to self-destruct when there is an abnormality, and prevent the weapon from accidentally acting or being captured. A segmented mathematical model was established to study the kinematic characteristics of the device, and the functional experimental was carried out. The results show that the water inlet device works reliably and can be applied to a variety of underwater weapons. The mathematical model can predict the performance parameters of the water inlet device during the movement process, providing support for the engineering application and optimal design of the device.

Section: Introductionmentioning

confidence: 99%

Design and mathematical modeling of a pyrotechnically actuated water inlet device

Shuai

et al. 2023

J. Phys.: Conf. Ser.

“…[6] used exible energy-gathering cutting cables to cut carbon ber composites, analyzed and discussed the phenomenon of composite delamination, and concluded that the strength and thickness of the plate have an impact on the delamination effect. Xiong et al [7] designed a three-dimensional (3D) nite element model of pyrotechnic cutters by using AUTODYN nite element simulation software and studied the in uence of explosion dynamic fracture process and blade acceleration distance on cutting effect. Yao [8] studied the working principle and separation characteristics of the explosive separation device through numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Explosive Separation Properties of Double-hole Charge Structure

Zhu

Chen

et al. 2022

Preprint

In order to explore the critical charge diameter for explosive separation of titanium alloy plates under the structure of double-hole charge. In this paper, based on the SPH algorithm in the AUTODYN software, a numerical model of the explosion separation of titanium alloy plates was established, and numerical simulations were carried out for different charge aperture models.According to the strength criterion and the simulation calculation results, the fracture judgment was carried out, and the fracture mechanism of the double opening separation was analyzed, and the law of the damage to the plate by the diameter of the charging hole was explored. According to the simulation results, the results show that the test results are highly consistent with the simulation results. When the double hole charge structure is used for explosive separation, the size of the charge aperture not only directly affects the effect of explosive separation, but also affects the flying off kinetic energy after plate fracture. Under the influence of various factors, the plate breaks from the hole wall from inside to outside, and finally breaks into a seam to complete the separation. With the increase of the charge hole diameter, the damage condition of the titanium alloy plate increases almost linearly, that is, the larger the charge hole diameter, the more serious the damage to the titanium alloy plate.

“…Hsiao [3] studied the characteristics of shaped charge jets using the finite element method. Xiong et al [4] designed a three-dimensional (3D) finite element model of pyrotechnic cutters by using AUTODYN finite element simulation software and studied the influence of explosion dynamic fracture process and blade acceleration distance on cutting effect. Takeuchi [5] simulates the separation and fracture process of the spacecraft according to the shock response.…”

Section: Introductionmentioning

confidence: 99%

Research on Explosive Separation of Carbon Fiber Composite Weave Plate

Zhao

et al. 2021

Shock and Vibration

By using the C-shaped metal lead shell and copper shell to wrap the detonating cord, the restraint of the explosion energy is improved, and the simple charge structure is used to achieve the purpose of effectively separating the carbon fiber composite woven plate in a limited and small space. The commercial software AUTODYN was used for numerical simulation, The monitoring points of stress, velocity, and specific internal energy were set up, combined with Tsai-Wu tensor strength criterion, the plate failure and the process of shell metal reflecting and absorbing energy when the plate was separated under the shell constraint were observed, respectively. Through further analysis of the experimental phenomena and calculated data, it is concluded that the main reason for the fracture failure of the plate is the opposing compression of the shock waves on both sides of the plate, and the layer cracks are caused by the tension of the stress wave in the later stage. The charge structure of the detonating cord wrapped by the metal shell can effectively use its inertia to restrain the explosion energy and improve the separation ability during the process of explosively separating the carbon fiber composite woven plate.