1 / 21

Laminates/Particulate Composite Materials

Laminates/Particulate Composite Materials. Laminate Composites. Materials combine to produce properties not present in any individual component What is a laminate composite? Layers of different materials are joined together.

jbridgers
Télécharger la présentation

Laminates/Particulate Composite Materials

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Laminates/Particulate Composite Materials

  2. Laminate Composites • Materials combine to produce properties not present in any individual component • What is a laminate composite? Layers of different materials are joined together

  3. Can you think of any materials that are used in your life that may be considered a laminate composite?

  4. Design of Laminate Composites • Designed to increase strength and decrease cost • Often have superior resistance to wear • Lightweight • Corrosion resistance

  5. Examples of Laminates • Formica • Layers of heavy kraft papers impregnated with resin overlaid by a plastic decorated sheet that is saturated with a plastic-saturated cellulose mat • Heat and pressure are used to bond the materials together

  6. Examples of Laminates • Capacitors: Capacitors consist of alternating layers of an insulator and a conductor • Example: Aluminum/Mica • The composite will have high conductivity parallel to the plates, but will be insulating in the perpendicular direction

  7. Kevlar • Developed by DuPont in 1960s Aramid synthetic fiber • •Polymer Fiber with very high tensile strength • •Often woven into composite materials • •Many applications – tires, body armor, sports

  8. Kevlar Composites • High tensile strength to weight ratio • On a weight basis, stronger than steel • Well-known component of body armor • Woven into a fabric that is layered for stren

  9. Formation of Laminar Composites • Techniques used to form these composite materials: • Roll bonding • Co-extrusion • Brazing

  10. Particulate composites • Particulate composites or particle reinforced composites • Particles suspended in matrix of another material • Materials can be metallic or non-metallic • Two main types: • Large-particle composites • Dispersion-strengthened composites

  11. Particle Composites: Concrete • Artificial stone-like material • •Made by mixing cement and various aggregates, such as sand, pebbles, gravel, shale, etc., with water • Matrix material: cement • Reinforcement: sand/gravel • Mixture is allowed to harden by hydration

  12. Particulate Composites: Concrete • Non-metallic material in a non-metallic matrix • Sand and gravel that is bonded in a matrix of cement and water • Chemically reacted and hardened to form concrete

  13. Concrete • Both Matrix and particles are considered ceramic materials • •Particles help reduce cost Cement is more expensive • Proportion of Particles-Matrix is important • Aggregate particles can comprise ~60% of material • Need enough matrix to coat particles, but not too much

  14. Dispersion-Strengthened Composites • Contains particles ~0.01-0.1 μm (10-100 nm) • Used to strengthen alloys – by interaction between two phases • Dispersed phase is often hard and inert materials – metallic or nonmetallic • Oxide materials

  15. Metallicparticles in Non-metallicmatrix composite materials • Metal flakes in a suspension is common. An example is aluminum paint is actually aluminum flakes suspended in paint. • Example: Cold Solder is a metal powder suspended in thermosetting resin

  16. Combinations • Laminated composites can have fiber-reinforced composite materials included in the layers: –Boat Hulls –Airplane wings and body sections –Tennis Racquets –Golf club shafts

  17. Definition of Homogenous Materials • Homogenous Material • material that cannot be mechanically divided into different materials • of uniform structure composition throughout • Heterogeneous Material • A material that is composed of elements that are different and can be separated

  18. Behavior of Composite Materials • Most many-made engineered materials are both Homogeneous and isotropic • Homogeneous – uniform structure and composition throughout the material • Isotropic – has material properties that are the same in all directions in the • Body the properties are independent of orientation of the material • Body with temperature-dependent isotropic materials properties are not homogeneous when subject to temperature gradient but are isotropic.

  19. What is an Anisotropic material? • Anisotropic Material • Properties of a material are directionally dependent • It can be defined as a difference, when measured along different axes, in a material's physical property (absorbance, refractive index, density, etc.) • Examples: wood – against the grain and with the grain there are different properties

  20. Supplementary information

  21. Resources and Websites • http://www.contourcomp.com/comp101.html Basic information about composites • http://www.science.org.au/nova/059/059key.htm Composites website

More Related