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.

Design of Laterally Loaded Plating—Uniform Pressure Loads

1981 ◽  
Vol 25 (02) ◽  
pp. 77-89
Author(s):  
Owen F. Hughes
Keyword(s):  
High Speed ◽  
Lateral Pressure ◽  
Experimental Studies ◽  
Steel Plates ◽  
Subsequent Paper ◽  
Rigid Plastic ◽  
Welded Steel ◽  
High Speed Impact ◽  
Laterally Loaded ◽  
Good Agreement

An explicit formula is presented for the design of welded steel plates subjected to uniform lateral pressure, on the basis of a designer-specified level of acceptable permanent set, including that due to welding. The formula is derived from a combination of theoretical and experimental studies and shows good agreement with experimental results. For the convenience of designers the formula is also given in the form of design curves. The paper also delineates the areas of application of this and other formulas for laterally loaded plating. In brief, the paper shows that for static and quasistatic loads the formula derived herein is more accurate than formulas based on either the pseudo-elastic or the rigid-plastic approach. As the load becomes more dynamic the rigid-plastic approach becomes more appropriate, and for high-speed impact loads the rigid-plastic approach is best. For quasistatic loads, such as slamming, the formula presented herein is somewhat conservative while the rigid-plastic formulas are somewhat optimistic. A similar formula for concentrated loads (such as wheel loads) will be presented in a subsequent paper.

New Approaches for Improved Efficiency and Flexibility in Process Chains of Press Hardening

2015 ◽  
Author(s):  
Dirk Landgrebe ◽  
Julia Schönherr ◽  
Norbert Pierschel ◽  
Stefan Polster ◽  
Andre Mosel ◽  
...  
Keyword(s):  
High Speed ◽  
Technology Development ◽  
Lightweight Design ◽  
High Strength ◽  
Press Hardening ◽  
High Speed Impact ◽  
Contact Heating ◽  
Process Chains ◽  
Impact Cutting ◽  
Significant Research

In the last decade, press hardening has become a fully established technology in both science and industry for the production of ultra-high-strength structural components, especially in the automotive industry. Beside the improvement of car performance such as safety and lightweight design, the production process is also one focus of trends in technology development in the field of press hardening. This paper presents an overview about alternative approaches for optimized process chains of press hardening, also including pre- and post-processing in addition to the actual forming and quenching process. Investigations on direct contact heating technology show new prospects regarding fast and flexible austenitization of blanks at compact device dimensions. By applying high speed impact cutting (HSIC) for trimming of press hardened parts, an alternative technology is available to substitute the slow and energy-intensive laser trimming in today’s press hardening lines. Combined with stroke-to-stroke control based on measuring of process-relevant parameters, a readjustment of the production line is possible in order to produce each part with individual, optimal process parameters to realize zero defect production of property-graded press hardened components with constant high part quality. Significant research in the field of press hardening was carried out at Fraunhofer Institute for Machine Tools and Forming Technology IWU, in the hot forming model process chain which enables the running of experiments under conditions similar to industrial scales. All practical tests were prepared by design of experiments and assisted by thermo-mechanical FE simulations.

Evaluation of the Impact Formulae for Rigid Projectile Striking on Concrete Target

2011 ◽  
Vol 368-373 ◽  
pp. 894-900 ◽  
Author(s):  
Hao Wu ◽  
Qin Fang
Keyword(s):  
Penetration Depth ◽  
Empirical Formula ◽  
High Strength Concrete ◽  
High Speed ◽  
High Strength ◽  
Local Damage ◽  
High Speed Impact ◽  
Rigid Projectile ◽  
Semi Empirical ◽  
The Impact

Based on the large amounts of field impact tests with different projectile nosed shapes, the abilities of the existing classical empirical and semi-empirical impact formulae in predicting the local damage of normal and high strength concrete targets (NSCT & HSCT) under the strike of rigid projectile were evaluated. It finds that, firstly, for the penetration depth, the Forrestal and Chen & Li semi-empirical formulae, BRL and Whiffen empirical formulae are advised for the NSCT under the impact of ogive nosed projectile; and Chen & Li semi-empirical formula and ACE empirical formulae are advised for the NSCT under the impact of special nosed projectile; the dimensionless penetration depth of NSCT increases linearly with the non-dimensional impact factor. Secondly, for the penetration depth, Chen & Li semi-empirical formula is advised for the HSCT under the mid-to-high speed impact, and the existing formulae are not applicable while the speed of the projectile was relatively low. Thirdly, for the perforation mode of the target, the BRL and Chang empirical formulae are advised for the NSCT, and the Chen semi-empirical formula, ACE and BRL empirical formulae are advised for the HSCT.

Trimming of Flat and Tubular Components by High Speed Impact Cutting (HSIC)

2017 ◽  
Author(s):  
Dirk Landgrebe ◽  
Tom Barthel ◽  
Frank Schieck
Keyword(s):  
High Speed ◽  
Construction Materials ◽  
High Strength ◽  
Lightweight Construction ◽  
Cycle Times ◽  
Reinforced Plastics ◽  
High Speed Impact ◽  
Cutting Surface ◽  
Impact Cutting ◽  
High Flexibility

The trend for lightweight construction, especially in the automotive industry, leads to increased use of corresponding lightweight materials. In addition to novel construction materials such as fiber-reinforced plastics, established materials such as steel or aluminum are continuously being further developed, which is usually accompanied by a distinct increase in their strength. Beside material-related lightweight construction, new designs are applied such as the profile design. The disadvantage of this development is that established forming processes such as deep drawing, profile bending, hydroforming but also shearing of high-strength components increasingly reach their process limits. Particularly, in the case of trimming of high-strength components such as press-hardened components, it is hard to present conventional shearing processes in serial processes due to low tool life and deficient cutting surface quality. For this reason the laser cutting technology is often used. It is characterized by high flexibility and can largely meet the requirements regarding component quality. In contrast to shearing, however, it requires very long process cycle times due to its process rate, which makes it significantly less productive. High speed impact cutting offers an alternative. By exploiting high speed effects in the material, which leads to adiabatic heating of the shearing zone and a related significant reduction in strength, even ultra-high strength steel materials with tensile strengths of above 1500 MPa can be cut at high quality and with a short cycle time. In order to transfer this technology to serial applications and to develop process limits, extensive investigations were carried out using high-strength sheet metal materials and tube materials. The results are presented in this paper.

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.

Development and Investigation of a Two-Layer Metal—Ceramic Material for Protective Barriers in Conditions of High-Speed Impact

2018 ◽  
Vol 63 (7) ◽  
pp. 988-994 ◽  
Author(s):  
A. N. Ishchenko ◽  
A. N. Tabachenko ◽  
R. N. Akinshin ◽  
S. A. Afanas’eva ◽  
I. L. Borisenkov ◽  
...  
Keyword(s):  
Ceramic Material ◽  
High Speed ◽  
High Speed Impact ◽  
Metal Ceramic

HIGH STRAIN RATE STUDY OF CERAMICS USING HOPKINSON BAR SYSTEM

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1147-1152 ◽  
Author(s):  
M. N. BASSIM ◽  
A. G. ODESHI ◽  
M. BOLDUC
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Speed ◽  
High Strain ◽  
Shear Bands ◽  
High Strength ◽  
Hopkinson Bar ◽  
High Speed Impact ◽  
Rate Study ◽  
Strain Rate Behavior

There are at present several applications where high strength ceramics have replaced metals that are subjected to high speed impact from projectiles. This requires an evaluation of behavior of ceramics under impact at high strain rates. This current study provides information on high strain-rate behavior of alumina tested in shear using torsional Hopkinson bar. Dynamic stress-strain curves were generated to investigate deformation behavior prior to fracture while fractography of the broken specimens was carried out to establish the mode of failure. The results of this investigation are similar to what is obtainable in metallic materials in which mechanism of damage is controlled by strain localization and formation of adiabatic shear bands.

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 Experimental and Numerical Investigation on the Layering Configuration Effect to the Laminated Aluminium/Steel Panel Subjected to High Speed Impact Test

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 732 ◽  
Author(s):  
Najihah Rahman ◽  
Shahrum Abdullah ◽  
Mohamad Abdullah ◽  
Wan Zamri ◽  
Mohd Omar ◽  
...  
Keyword(s):  
Weight Reduction ◽  
High Speed ◽  
Impact Test ◽  
Permanent Deformation ◽  
High Strength ◽  
Computational Method ◽  
Vehicle Body ◽  
Ballistic Performance ◽  
Steel Panel ◽  
High Speed Impact

This paper presents the effect of laminated aluminium-steel panel with different configurations in a high-speed impact test. Layering aluminium plate with high strength steel has become an interest in reducing the overall density of armour vehicle body while improving the ballistic resistance. Different layering configurations differ in laminated panel performance. Two layering configurations of double-layered panel achieving 25% of existing panel weight reduction were tested using experiment and computational method to investigate their behaviours when impacted with 7.62-mm full metal jacket at velocity range of 800–850 m/s. The ballistic performance of each configuration plate in terms of ballistic limit velocity, penetration process and permanent deformation was quantified and considered. Laminated panel with aluminium as the front layer reduced the ballistic performance of existing panel to 50% and the other panel maintained its performance. Thus, the laminated panel with aluminium as the back layer can be used in designing a protective structure for armoured vehicle while maintaining the performance of the existing vehicle in achieving weight reduction.

Dynamic observation of high speed laser-arc combination welding of thick steel plates

1997 ◽  
Author(s):  
Nobuyuki Abe ◽  
Yasushi Kunugita ◽  
Masakazu Hayashi ◽  
Yoshiaki Tsuchitani
Keyword(s):  
High Speed ◽  
Steel Plates ◽  
Dynamic Observation ◽  
Thick Steel
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