Dissertation > Excellent graduate degree dissertation topics show

Study on Counter-gravity Infiltration Casting Fabrication and Properties of Al2O3k/Al Porous Composites and Sandwich Panel

Author: ZhangTaiKang
Tutor: ZhouXiangYang
School: Central South University
Course: Electrochemical Engineering
Keywords: counter-gravity infiltration casting porous Al matrix composites compressive properties energy absorption characteristic three-point bending properties
CLC: TG292
Type: Master's thesis
Year: 2011
Downloads: 46
Quote: 0
Read: Download Dissertation

Abstract


Owing to its structure and function properties, porous aluminum has a wide range of applications in automotive, construction and aerospace field. The Al2O3k/Al porous composites and its sandwich panel were prepared by the counter- gravity infiltration casting method, and deep and systemic research on the mechanical properties of compressive property Al2O3k/Al porous composites and sandwich panel were carried out. The following conclusions were obtained in this master’s thesis:(1) Al2O3k/Al porous composites were fabricated by the counter-gravity infiltration casting using 6063 alloy as matrix metal, alumina-hollow sphere as pore-forming particles. The results show that the infiltrating effect of Al2O3k/Al porous composites was improved by increasing the diameter of hollow-sphere, increasing the pre-heating temperature of hollow sphere and the temperature of the aluminum melt, raising filling pressure, prolonging holding time, selecting from top to bottom cooling method and adding active element Mg.(2) The quasi-static compressive properties of Al2O3k/Al porous composites were studied. The results are as follows:the quasi-static compressive stress-strain curves of Al2O3k/Al porous composites include three stages. The main failure characteristics are strain localization and the failure occurred layer by layer. The yield strengths of Al2O3k/Al porous composites increase with decreasing the diameter of Al2O3-hollow sphere and void content, but increasing void content is good for prolonging the collapse plateau region. Fitting coefficients K were calculated by strength fitting calculation in Ashby formula, and the results are K>0.75.(3) The energy-absorption characteristic of Al2O3k/Al porous composites was studied. The results are as follows:the energy absorption capacities of Al2O3k/Al porous composites mainly lie on the yield strength, the length of the collapse plateau region and the strain hard exponent. The energy absorption efficiencies are dependent on the ratio of upper yield strength to lower yield strength, the ratio of the yield strain to the densification strain, and the ratio of the elastic module to the strain hard exponent. The energy absorption capacities would increase with decreasing the diameter of Al2O3-hollow sphere and void content, increasing strain rate. The energy absorption efficiencies are independent of the diameter of Al2O3-hollow sphere, and it increase with increasing void content and decreasing strain rate.(4) The sandwich panels of Al2O3k/Al porous composites were prepared. The three-point bending P-δcurves of Al2O3k/Al porous composites sandwich panels have the features of typical sandwich panels. It is found that the sandwich panels of Al2O3k/Al porous composites have more excellent three-point bending properties. The main failure modes of Al2O3k/Al porous composites sandwich panels include the core-material shear crack and the panel bending, and there is no crack appearance in interface.

Related Dissertations

  1. Study on Frequent Freeze-thaw Cycle Response of Asphalt Mixture in Permafrost Areas,U414
  2. Experimental Study on Compressive Property of Grouted Concrete Non-Stardard Block Masonry,TU364
  3. Microstructure and Properties of BT20-xB-yY High Temperature Titan Ium Alloys,TG146.23
  4. Research on Mechanical Behavior of Zr-Based Bulk Amorphous Alloy,TG139.8
  5. Preparation of Aluminum Foam and Its Compressive Properties Research,TB383.4
  6. Structure and Properties of Braided Peripheral Nerve Regeneration Conduit,R318.0
  7. Testing Research on Mix Proportion and Mechanical Performance of Steel Fiber Reinforced Self-Compacting Concrete,TU528.572
  8. Experimental Research on the Fundamental Mechanical Behavior of Steel Fiber Reinforced Lightweight Aggregate Concrete,TU528.572
  9. Research on Process and Properties of Open Cell Aluminum Foams by the Space-holder Method,TF124
  10. The Glass-Forming Ability and Mechanical Behavior of Mg-Cu-Gd(-Al) Bulk Metallic Glass,TG139.8
  11. Experimental Research on Mechanical Properties and Fracture Properties of Steel Fiber Reinforced Recycled Concrete,TU528.572
  12. Experimental Research on Recycled Rubber Powder Modified High Strength Concrete,TU528.31
  13. Biaxial weft knitted fabric reinforced lining yarn mechanical properties of the composites,TB332
  14. Continuum Structural Topology Optimization Approach Based on Bone Remodeling Theory,TB114.1
  15. Design of Impact Test Table for Vehicle Parts and Analysis on the Test,U467.52
  16. Study on DC Casting of Aluminum Alloy under the Dual-frequency Electromagnetic Fields,TG292
  17. Studying on Dual-Ingot Low Frequency Electromagnetic Semi-Continuous Casting,TG292
  18. The Research of Fluidity and Hot Tearing for Cast NZ30K Mg Alloy,TG292
  19. Influence of Microstructure on Pull-Compression Fatigue Properties at Room Temperature of NZ30K Cast Magnesium Alloys,TG292
  20. Research on Surface Alloying of Lost Foam Casting Magnesium Alloy,TG292
  21. Study on Hdrogen Degassing Effect of Ultrasonic Vibration on Both Liquid Melt and Semi-solid Slurry of Al Alloy,TG292
  22. Magnesium alloy cylinder casting process and simulation analysis,TG292

CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Non-ferrous metal casting > Light metal casting
© 2012 www.DissertationTopic.Net  Mobile