Explosive loading and penetrating stability evaluation method based on equivalent model experiment
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A technology of equivalent model and model experiment, applied in the direction of measuring device, using mechanical device, using stable tension/pressure to test the strength of materials, etc., can solve the problem of high research cost, non-equivalent explosive charge and long cycle. And other issues
Inactive Publication Date: 2016-10-12
XIAN MODERN CHEM RES INST
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[0004] The deficiencies and defects of the prior art are: (1) the stress environment of the explosive charge in the laboratory model experiment is not equivalent to the stress environment of the explosive charge during the warhead penetration process; (2) the evaluation of the live ammunition shooting experiment Method research costs are high, the cycle is long, and dynamic response parameters are difficult to obtain
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Embodiment 1
[0064] In this embodiment, the warhead filled with high-energy explosives penetrates a 6-meter-thick reinforced concrete target at a speed of 900 m / s.
[0065] Step 1: Acquisition of dynamic mechanical properties and thermophysical properties of explosive charges
[0066] The explosive charge was tested at a strain rate of 3200s using a separate Hopkinson pressure bar -1 , 3700s -1 The dynamic mechanical performance parameters at 4300 and 4300, the stresses are 25.6MPa, 28MPa and 30MPa respectively, and the strains are 1.9%, 2.4% and 2.8%, respectively.
[0067] According to the method 405.1, method 408.2 and method 409.2 in GJB772A-97, the specific heat capacity, linear expansion coefficient and thermal conductivity of the explosive charge are respectively: 1.327J / g / ℃, 9.1(10 -5 K -1 ) and 1.21W / (m·K).
[0068] Step 2: Determine the maximum compressive load and friction load experienced by the explosive charge penetration process
[0069] Using the commercial software LS...
Embodiment 2
[0078] In this embodiment, a 500kg-class warhead loaded with high-energy explosive penetrates a 30mm thick steel target at a speed of 700m / s. The device and steps used for evaluating the penetration stability of the explosive charge are the same as in Embodiment 1.
[0079] Explosive charges at a strain rate of 3000s -1 、3500s -1 The dynamic mechanical performance parameters at 4100 and 4100, the stresses are 28.6MPa, 35MPa and 41MPa respectively, and the strains are 1.9%, 1.8% and 1.6%, respectively. The specific heat capacity, linear expansion coefficient and thermal conductivity of the explosive charge are: 1.245J / g / ℃, 8.2(10 -5 K -1 ) and 0.77W / (m·K).
[0080]The LS-DYNA calculation results show that the maximum compressive stress on the explosive charge is 800MPa, the stress rise time is about 40us, that is, the stress rate is 20MPa / us, and the maximum frictional power density is 3.2×10 7 w / m 2 .
[0081] In the equivalent strengthening model test, strengthening exp...
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Abstract
The invention discloses an explosive loading and penetrating stability evaluation method based on an equivalent model experiment. The method comprises the following steps that firstly, dynamic mechanical performance and thermophysical parameters of explosive loading are actually measured, and a largest compression load and a largest friction load which are borne in the penetrating process of explosive loading are determined by means of numerical simulation; secondly, a loading device equivalent to a corresponding stimulus type is designed, reaction conditions of loaded explosive under stimulus of different load intensities are observed through an intensifying experiment method, and the explosive loading and penetrating stability reliability is calculated according to an intensification coefficient; finally, the explosive loading and penetrating stability reliability calculated through the model experiment is compared with that of the engineering test requirement, and whether the explosive loading and penetrating stability reliability meets the engineering test requirement or not is judged. The method for evaluating the explosive loading and penetrating stability through the model experiment can reduce the experiment cost, shorten a research cycle and effectively support application and development of a penetrating warhead.
Description
technical field [0001] The invention belongs to the technical field of charge stability, and relates to a method for evaluating stability of explosive charge, in particular to a method for evaluating penetration stability of explosive charge based on an equivalent model experiment. Background technique [0002] In wars in recent years, penetrating warheads have become an important means of attacking deep underground targets or ships. In the process of penetrating the warhead to attack the target, the explosive charge needs to withstand a very complex and severe stress environment, which may lead to key problems such as damage to the explosive charge, damage to structural integrity, and even early explosion, thus affecting the use safety of the warhead sex and combat effectiveness. Therefore, it is necessary to carry out the stability evaluation of explosive charges under penetration conditions, so as to provide a basis for the selection of penetration explosive charges and ...
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