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Review COMPOSITE SANDWICH PANEL UNDER BUCKLING BEHAVIOUR

Review COMPOSITE SANDWICH PANEL UNDER BUCKLING BEHAVIOUR. Joko Sedyono Supervisor: Dr Homa Hadavinia. Department of Mechanical Engineering, Kingston University London, Roehampton Vale Friars Avenue London SW15 3DW. Content. Introduction Metal-Matrix Composites (MMC)

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Review COMPOSITE SANDWICH PANEL UNDER BUCKLING BEHAVIOUR

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  1. ReviewCOMPOSITE SANDWICH PANEL UNDER BUCKLING BEHAVIOUR Joko Sedyono Supervisor: Dr Homa Hadavinia Department of Mechanical Engineering, Kingston University London, Roehampton Vale Friars Avenue London SW15 3DW

  2. Content • Introduction • Metal-Matrix Composites (MMC) • Ceramic-Matrix Composites (CMC) • Polymer-Matrix Composites (PMC) • Buckling Under Monotonic Loading • Buckling Under Impact Loading • Method of Measurement of Out-of-Plane Deflection Point and Full Field • Post Buckling

  3. Introduction

  4. Composite Material Two inherently different materials that when combined together (macroscopic scale) produce a material with properties that exceed the constituent material (Shafer, 2010)

  5. Composites can be classified by their matrix material: -Metal matrix composites (MMC’s) -Ceramic matrix composites (CMC’s) -Polymer matrix composites (PMC’s) COMPOSITES

  6. MMC - Metal Matrix Composites -The matrix is relatively soft and flexible. -The reinforcement must have high strength and stiffness -Since the load must be transferred from the matrix to the reinforcement, the reinforcement-matrix bond must be strong. MMC use: -Two types of particulates ( dispersion strengthened alloys and regular particulate composites) -Or long fiber reinforcements Keulen, 2010

  7. CMC – Ceramic Matrix Composites -The matrix is relatively hard and brittle -The reinforcement must have high tensile strength to arrest crack growth -The reinforcement must be free to pull out as a crack extends, so the reinforcement-matrix bond must be relatively weak Polymer Matrix Composites -The matrix is relatively soft and flexible -The reinforcement must have high strength and stiffness -Since the load must be transferred from matrix to reinforcement, the reinforcement-matrix bond must be strong (Keulen, 2010)

  8. Polymer-Matrix Composites (PMC)

  9. Fibre

  10. Natural fibres

  11. Weight Considerations Aramid fibers are the lightest 1.3-1.4 g/cc Carbon 1.79 g/c Fiberglass is the heaviest 2.4 g/cc

  12. Strength Considerations Carbon is the strongest 600-800 ksi Fiberglass 400-600 ksi Aramids 400 ksi

  13. Impact Resistance Kevlar is the toughest Fiberglass Carbon

  14. Stiffness Considerations Carbon is the stiffest 30-40 msi Aramids 14 msi Fiberglass 10-13 msi

  15. Cost Considerations Fiberglass is cost effective $5.00-8.00/lb. Aramids $20.00/lb Carbon $30.00-$50.00/lb

  16. Fibre architecture

  17. Figure 30 Photos and Schematic Drawing of A Micro-Braided Yarn [8]

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