Dissertation > Excellent graduate degree dissertation topics show

Tungsten fiber reinforced amorphous composite penetration behavior of bulk metal

Author: XiaLongXiang
Tutor: DuZhongHua
School: Nanjing University of Technology and Engineering
Course: Mechanical Design and Theory
Keywords: tungsten fiber/BMG composite penetration numerical simulation mechanical properties
CLC: TB331
Type: Master's thesis
Year: 2014
Downloads: 18
Quote: 0
Read: Download Dissertation

Abstract


The penetration behaviors of different structures with different aspect ratios80vol.%tungsten fiber/Zr38Ti17Cu10.5Co12Be22.5bulk metallic glass composite rods have been studied. The following conclusions are,In the penetration process of large aspect ratio tungsten fiber/Zr based bulk metallic glass composite rods, the Zr based BMG vaporized and tungsten fibers show bending fracture, distortion and sheer fracture. The tungsten fibers in the head of rods also appear to melt and splitting phenomenon and the head of rods shows shear deformation apparently. In the while, target occurs failure model with splitting and spalling under the action of amorphous alloys gas, which is similar to mechanism of detonation gas acts to rock phenomenon. In the same impact energy, penetration ability of composite material is superior to93W alloy.When in the test of small aspect ratio and aluminum jacketed tungsten fiber/Zr based BMG composite rods, the results can’t reflect the penetration behavior of composite material accurately. The specific reasons need for further research and analysis.The penetration test of45steel jacketed, no interval segmented and nylon interval segmented tungsten fiber/Zr based BMG composite rods show that the penetration depth remains relatively constant when the velocity exceeds a certain value. In the rising phase of penetration depth, the depth of nylon interval segmented rod maximum, following is no interval segmented rod, and the last is45steel jacketed rod in the same velocity. And the penetration ability of the three structural tungsten fiber/Zr based BMG composite rods is prior to of small aspect ratio93W alloy rods under the existing launch velocity (about1800m/s). In addition, multiple coronary cracks were found around the crater of the composite rods and93W alloy rods.On the basis of experiments, three dimensional numerical simulations on penetration process are carried out by using LS-DYNA. From numerical calculation we can obtain that appearance of crater is similar to the actual situation. In the while, the curves of penetration depth vs. velocity, which can be gotten by simulate calculation of multiple velocities, can reflect the change law of penetration depth in the test well.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  6. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  7. Effectiveness Evaluation on the Jointed Combat of the Multiple Missiles and Research on Combinatorial Optimization Algorithm,TJ760.1
  8. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  9. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  10. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  11. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  12. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  13. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  14. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  15. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  16. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  17. Mathematics Teaching Material for Primary School Mathematical Thinking in the Point of Penetration,G623.5
  18. Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
  19. Research on a Fire-fighting Shell for Towers,TU892
  20. Apical sealing ability of different obturation techniques and clinical efficacy,R781.05
  21. Coal and gas outburst Hou Wasi Dynamic Emission Law,TD713

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal composite materials
© 2012 www.DissertationTopic.Net  Mobile