Porous Barriers Efficiency Research under the Compact Elements High-Speed Loading (Part Two)

2020 ◽  
Vol 303 ◽  
pp. 1-7
Author(s):  
E.N. Kramshonkov ◽  
A.V. Krainov ◽  
Evgeny N. Pashkov
Keyword(s):  
Numerical Simulation ◽  
Impact Velocity ◽  
High Speed ◽  
Equal Mass ◽  
Tungsten Alloy ◽  
Shock Interaction ◽  
Initial Speed ◽  
Velocity Range ◽  
High Speed Impact ◽  
Porous Barriers

The paper discusses the results of the numerical simulation of high-speed impact effect of compact projectiles made of steel and tungsten alloy with steel obstacles of equal mass. The obstacles have different initial porosity of the material. Conducted the final evaluation of the penetration speed of the projectile depending on the porosity of the obstacle and the initial speed of the shock interaction. The initial impact velocity range from 1 to 16 [km/s]. The destruction, melting and evaporation of the interacting bodies are taken into account. The analysis of porosity influence evaluation of obstacles material revealed that the protective advantage of porous obstacles disclose at the higher impact velocities, greater than 1.5 [km/s] for steel strikers and 2 [km/s] for projectiles of tungsten alloy. The more impact velocity the more protective effect of porous obstacles.

Porous Barriers Efficiency Research under the Compact Elements High - Speed Loading

2018 ◽  
Vol 927 ◽  
pp. 48-54 ◽  
Author(s):  
E.N. Kramshonkov ◽  
A.V. Krainov ◽  
E.N. Pashkov
Keyword(s):  
Numerical Simulation ◽  
Impact Velocity ◽  
High Speed ◽  
Equal Mass ◽  
Tungsten Alloy ◽  
Shock Interaction ◽  
Initial Speed ◽  
Velocity Range ◽  
High Speed Impact ◽  
Porous Barriers

The paper discusses the results of the numerical simulation of high-speed impact effect of compact projectiles made of steel and tungsten alloy with steel obstacles of equal mass. The obstacles have different initial porosity of the material. Conducted the final evaluation of the penetration speed of the projectile depending on the porosity of the obstacle and the initial speed of the shock interaction. The initial impact velocity range from 1 to 16 [km/s]. The destruction, melting and evaporation of the interacting bodies are taken into account. The analysis of porosity influence evaluation of obstacles material revealed that the protective advantage of porous obstacles disclose at the higher impact velocities, greater than 1.5 [km/s] for steel strikers and 2 [km/s] for projectiles of tungsten alloy. The more impact velocity the more protective effect of porous obstacles.

scholarly journals Cratering for Impact of Hypervelocity Projectiles into Granite Targets within a Velocity Range of 1.91–3.99 km/s: Experiments and Analysis

2020 ◽  
Vol 10 (4) ◽  
pp. 1393
Author(s):  
Xiaofeng Wang ◽  
Jingbo Liu ◽  
Biao Wu ◽  
Defeng Kong ◽  
Jiarong Huang ◽  
...  
Keyword(s):  
Impact Velocity ◽  
Scaling Law ◽  
Density Ratio ◽  
Hypervelocity Impact ◽  
Experimental Results ◽  
Tungsten Alloy ◽  
Regression Equations ◽  
Velocity Range ◽  
Predicted Values ◽  
The Impact

To understand and analyze crater damage of rocks under hypervelocity impact, the hypervelocity impact cratering of 15 shots of hemispherical-nosed cylindrical projectiles into granite targets was studied within the impact velocity range of 1.91–3.99 km/s. The mass of each projectile was 40 g, and the length–diameter ratio was 2. Three types of metal material were adopted for the projectiles, including titanium alloy with a density of 4.44 g/cm3, steel alloy with a density of 7.81 g/cm3, and tungsten alloy with a density of 17.78 g/cm3. The projectile–target density ratio (ρp/ρt) ranged from 1.71 to 6.86. The depth–diameter ratios (H/D) of the craters yielded from the experiments were between 0.14 and 0.24. The effects of ρp/ρt and the impact velocity on the morphologies of the crater were evaluated. According to the experimental results, H/D of craters is negatively correlated with the impact velocity, whereas the correlation between H/D and ρp/ρt is weak positive. The crater parameters were expressed as power law relations of impact parameters by using scaling law analysis. The multiple regression analysis was utilized to obtain the coefficients and the exponents of the relation equations. The predicted values of the regression equations were close to the experimental results.

High-speed impact assessment for composite air inlet

2019 ◽  
Vol 11 (5) ◽  
pp. 723-736
Author(s):  
Radek Doubrava ◽  
Martin Oberthor ◽  
Petr Bělský ◽  
Jan Raška
Keyword(s):  
Numerical Simulation ◽  
Composite Structure ◽  
High Speed ◽  
Numerical Models ◽  
Impact Resistance ◽  
High Speed Camera ◽  
Content Type ◽  
High Speed Impact ◽  
Air Inlet ◽  
Final Design

Purpose The purpose of this paper is to describe the approach for the design of a jet engine composite air inlet for a new generation of jet trainer aircraft from the perspective of airworthiness requirements regarding high-speed impact resistance. Design/methodology/approach Validated numerical simulation was applied to flat test panels. The final design was optimised and verified by validated numerical simulation and verified by testing on a full-scale demonstrator. High-speed camera measurement and non-destructive testing (NDT) results were used for the verification of the numerical models. Findings The test results of flat test panels confirmed the high durability of the composite structure during inclined high-speed impact with a near-real jet inlet load boundary condition. Research limitations/implications Owing to the sensitivity of the composite material on technology production, the results are limited by the material used and the production technology. Practical implications The application of flat test panels for the verification and tuning of numerical models allows optimised final design of the air inlet and reduces the risk of structural non-compliance during verification tests. Originality/value Numerical models were verified for simulation of the real composite structure based on high-speed camera results and NDT inspection after impact. The proposed numerical model was simplified for application in a real complex design and reduced calculation time.

Dynamic response and numerical simulation of Al-Sc and Al-Ti alloys under high-speed impact

2015 ◽  
Vol 25 (2) ◽  
pp. 559-570
Author(s):  
Wei-gui ZHANG ◽  
Liang-ju HE ◽  
Pei-jie LI ◽  
Yi-cong YE ◽  
Xue FENG ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
High Speed ◽  
High Speed Impact ◽  
Ti Alloys

scholarly journals Исследование защитных свойств комбинированного металлокерамического материала при высокоскоростном ударе

2020 ◽  
Vol 90 (6) ◽  
pp. 965
Author(s):  
А.Н. Ищенко ◽  
С.А. Афанасьева ◽  
Н.Н. Белов ◽  
В.В. Буркин ◽  
В.М. Захаров ◽  
...  
Keyword(s):  
High Speed ◽  
High Strength ◽  
Penetration Resistance ◽  
Steel Plates ◽  
Experimental Facility ◽  
Velocity Range ◽  
High Speed Impact ◽  
Metal Ceramic ◽  
Force Impact ◽  
Experimental Researches

The analysis of ballistics resistance of a combined metal-ceramic material based on high-strength ceramics in conjunction with the intermetallic on high strength metallic substrate layer – (TiB2+NiTi)+Ti in comparison with the steel plates, the titanium alloy BT1-0 plates and the corundum ceramics plates under impact with the steel spherical striker in velocity range about 2500 m/s was carried out. An experimental researches of protective barriers under the high-speed impact were carried out on the high-speed ballistic experimental facility. A mathematical modeling for the porous elastoplastic medium with taking an account various mechanisms of materials disruptions which was modified for mediums with complicated composition was carried out. There is shown, under the considered impact velocity range at breaking through barriers, in spite of low superficial density, a material (TiB2+NiTi)+Ti shows more force impact on the striker and greater penetration resistance then the steel, the titanium and the ceramics.

Numerical simulation on high speed impact behavior of Al-W and Al-Ni mixture

2018 ◽  
Vol 32 (10) ◽  
pp. 4629-4636
Author(s):  
Kyungsun Chung ◽  
Hyoungjoon Kwon ◽  
Jung Su Park ◽  
Soonho Song
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Impact Behavior ◽  
High Speed Impact

scholarly journals Penetration and bouncing during impact in shallow cornstarch suspensions

2020 ◽  
Vol 22 (1) ◽  
Author(s):  
Ricardo Arturo Lopez-de-la-Cruz ◽  
Devaraj van der Meer ◽  
Adeline Pons
Keyword(s):  
Recent Work ◽  
Impact Velocity ◽  
Solid Fraction ◽  
High Speed ◽  
Deep Layer ◽  
High Speed Impact ◽  
The Impact

AbstractThe impact-activated solidification of cornstarch suspensions has proven to be a multi-faceted problem and a complete explanation of the different phenomena observed during this process remains elusive. In this work, we revisit this rich problem and focus on impact on shallow suspension baths where the solidification partly leads to bouncing of the impactor. We systematically vary the depth and solid fraction of the suspension, the mass of the impactor, and the impact velocity to determine which conditions lead to bouncing. For cases where bouncing occurs we observe distinctly different dynamics as compared to those cases without it. Our results allow us to connect the velocity oscillations and stop-go cycles that were observed during settling in a deep layer, with more recent work dealing with high-force and high-speed impact on a cornstarch suspension.

Sign in / Sign up

Export Citation Format

Share Document