Material 2022 Exam Prep 3

Timber as a natural material is

• Isotropic

• Anisotropic

• Metallic

• Covalent

What does Anisotropic mean?

• loading in certain directions will result in a bigger strain than loading in other directions

• loading in certain directions will result in less strain than loading in other directions

• loading in certain directions will result in equal strain as loading in other directions

• loading in certain directions will result in strain being applied in other directions

Processed timber tends to take the material and re-form it to give a significant improvement in its

• Workability

• Compressive strength

• Tensile strength

• Shear strength

What is not considered a defect of timber?

• Knots

• Heartwood

• Heart Shakes

• Sloping grain

• Sapwood

Natural timber is also susceptible to

• Biological Attacks

• Chemical Attacks

• Human Attacks

• Neither

Moisture and nutrients are held within what kind of timber?

• Dry Timer

• Wet Timber

• Natural Timber

• Engineered Timber

Solid timber sizes are limited by the size of ______ while in processed timber, larger sizes can be ________.

• Trunk/Produce

• The Tree/Purchase

• Limbs/milled

• Production/Trunk

Processed timber is usually drier, and often formed with adhesives that are poisonous, or significantly less attractive, to the biological organisms.

• True

• False

What is the reason behind the brittle behaviour of normal glass (stress concentration)

• The strength of the glass is widely affected by minute surface defects (cracks)

• Stress is then concentrated around the defects

• This increase the fracture rate widely and gives glass their brittle behaviour.

• All of the above

Toughened Glass: It is formed when glass is cooled very quickly which inside stay hot (in tension) and outside cooled quickly (compression).

• True

• False