UNIT 3 L2: PERFORMANCE CHARACTERISTICS Flashcards
1
Q
What is the definition of performance characteristics?
A
Describes how a material behaves in different contexts and what it looks like.
2
Q
What do performance characteristics include?
A
- Grain pattern and direction
- Surface defects
- Warpage
- Shrinkage
- Splitting
- Joining
- Forming
- Machine quality
- Resistance to decay
- Moisture resistant
- Toxicity
- Steam bending
3
Q
How can the wood grain affect timbers?
A
Affect timbers machining and cost
4
Q
What are wood fibres made from?
A
Hollow straw-like cells which carry water and nutrients to and from the roots and leaves, making the wood strong along its length
5
Q
How do you identify the direction of the wood grain?
A
- Looking for the ray (small cells) rising to the surface of the wood or through touch, wood will always split in the direction of the rays
6
Q
what is an anisotropic material?
A
has properties that differ according to the direction of measurement.
7
Q
what timbers are not anisotropic?
A
Manufactured boards like MDF and Plywood
8
Q
what does hygroscopic?
A
means it behaves like a sponge - absorbs moisture and swells up in damp conditions. e.g. wood
9
Q
A
