Topic 1&2

Topic 1&2

1. A structure is an object with a definite shape and serves a purpose

2. For it to perform it resists forces/stresses

3. The weight carried or supported by the structure is the load

   • Shell structures have two useful features: Completely empty, the space

4. Structures are clssified by those that share common features

5. Natural Structures: Not made by people

6. manufactured: things built by people

7. Mass structures: Pilling up or forming similar materials into a certain shape

8. Frame Structures: The body is a skeleton with strong materials supporting it

9. Shell structures: Objects that use thin, carefully shaped outer layer material to provide strength and ridigity

10. The function is the main purpose

11. aesthetics refers to such designs as " aesthetically" pleasing

    • Designers choose materials with characteristics that match the purpose of the structure
      • Composite Material: material made from more than one kind of material
        • reinforced concrete is made from combining concrete with steel rods
        • layering materials can often produce useful combinations of properties
          • Lamanations: Layers of different materials
            • Yarn is an example of woven material

12. Structures that are stronger are more exspensive because they use bigger and more materials

13. They need to balance disadvantages and advantages

    • Consider ; Cost, Apperance, Enviromental impact, Energy effiency
      • structures are often weakest when their are parts joined together
        • Mobile Joints are joints that allow movement
          • joints that secure parts together are called rigid joints

14. Joints fit into 5 categories: Fastners, interlocking shaes, adhesives, melted joints, ties

    • Fastners hold things together but can weaken material
      • interlocking shapes hold themselves together
        • Ties; string, rope
          • Adhesives; glue, solvent based: harden as dry out- thermosetting: harden when cooled

15. Melting: Welding and soldering. welding; melting 2 together- Soldering: sticking 2 together