Calculation of armor-resistant metal multilayer armored structures using the finite element method
DOI:
https://doi.org/10.32347/2410-2547.2019.103.145-164Keywords:
model, armor-resistant, high-speed impactor, protective multilayered obstacles, solid-phase welding, deformationAbstract
At present, when the power of modern kinetic weapons is constantly increasing, traditional metallurgical and materials science approaches to the production of homogeneous rolled steel of armored steels are no longer able to provide high dynamic stability. Fulfillment of this requirement leads to a significant increase in the thickness of the armor and, accordingly, the mass of the armored structure as a whole. One of the ways to solve this problem is the use of multilayer metal composites. The combination of high hard (but brittle) and soft (but viscous) steel layers into composites provides composites with a combination of hardness and viscosity that cannot be achieved using traditional methods of manufacturing armored steels (an emergenton property).
In this paper, the process of interaction of high-speed impactor with protective multilayered armored obstacles, which was created by welding solid layer composites in a solid phase (without melting) by vacuum-deformation technique is considered.
The mechanism of the use of the finite element method for calculating the protective strength of the protective obstacles is investigated. Selected and substantiated source data for simulation modeling. For the modeling of physical phenomena that occur in the impactor and obstacle, such as strain and speed hardening, temperature weakening, destruction, etc. models of behavior of materials were used, which in the general case consist of three main elements: the state of equation, plasticity model and the damage model.
The results of calculating the armored-strength resistance of a two-layer armor plate of the following structure: the first layer (frontal) - instrumental carbon steel HRC >= 60 thickness 6 mm, second (back) - steel HRC=40 thickness 4 mm with the impact of impact high-impact impressive element. Influence of the features of the technology of compound of layers on the behavior of the center of mass velocity and the bottom of bullet velocity of and the distribution of the equivalent stress across the Mises is considered. Further researches are related to obtaining the dependence of armor-resistant multilayer armor plates on their overall thickness and structure (composition and ratio of layers), which will allow formulating recommendations for the choice of protective structures.
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