Quiz on Composite Materials

What is a composite material?

• A material that is only found in nature

• A material made from a single constituent

• A material made from two or more distinct constituent materials

• A material that cannot be engineered

What is the role of the matrix phase in a composite?

• To make the composite more brittle

• To increase the weight of the composite

• To provide the desirable material properties

• To form a mechanical and chemical bond with the dispersed phase

Which of the following is a common type of fibre-reinforced polymer matrix composite?

• Steel

• Concrete

• Wood

• Carbon-fibre-reinforced polymers (CFRP)

What is a quasi-isotropic laminate?

• A laminate with only one layer

• A laminate with fibres all running in the same direction

• A laminate with no specific orientation

• A laminate with similar properties in all in-plane directions

What is the main advantage of using fibre-reinforced composites in aerospace?

• High cost

• Low corrosion resistance

• High weight

• High strength-to-weight and stiffness-to-weight ratios

What is a key drawback of fibre-reinforced composites?

• They are easy to weld

• They are difficult to design with due to anisotropic nature

• They are very ductile

• They have high thermal expansion

What is a characteristic of ceramic matrix composites?

• They are very ductile

• They have low melting points

• They are poor conductors of heat

• They are extremely resistant to temperature without being too brittle

What is the purpose of using a honeycomb structure in sandwich composites?

• To increase the weight

• To make the composite more brittle

• To decrease the bending stiffness

• To provide a lightweight core that increases bending stiffness

What is the main limitation of using ever-thinner fibres in composites?

• Cost constraints

• Manufacturing constraints

• Environmental constraints

• Design constraints

What is a unique feature of Onshape CAD platform?

• It is not cloud-based

• It does not support parametric modelling

• It requires a powerful machine to run

• It allows multiple people to work on the same files simultaneously