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MATS1101 - Engineering Materials and Chemistry - T3 2025

MATS1101 - Engineering Materials and Chemistry - T3 2025

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A composite may be made using epoxy resin with glass fibres. The G_c (fracture toughness) of glass is around 8 J m^-2 and that of epoxy resin is around 500 J m^-2. Which of the following would you expect the composite's fracture toughness to be?

8Jm^-2, because the toughness is determined by the least tough constituent in the composite.

>500Jm^-2, because of the extra energy used in fibre debonding and pullout.

500Jm^-2, because the toughness is determined by the most tough constituent in the composite.

between 8 and 500Jm^-2, because the toughness is always intermediate between the toughness of fibres and the toughness of the matrix.

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A composite consisting of aligned glass fibres in a polyester matrix is loaded in a direction parallel to the reinforcing fibres. If there is 45 vol% fibres, modulus of the fibres is 69 GPa and modulus of polyester is 4.0 GPa, determine the fraction of the total composite load carried by the fibres.

A composite containing carbon fibres in epoxy resin is loaded in a direction perpendicular to the reinforcing fibres. If there is 45 vol% fibres, modulus of the carbon fibres is 380 GPa and modulus of epoxy is 3.0 GPa, determine the modulus of the composite. Use this equation to calculate the modulus of the composite:

6.9 GPa

7.0 GPa

4.3 GPa

5.4 GPa

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A composite containing carbon fibres in epoxy resin is loaded in a direction parallel to the reinforcing fibres. If there is 55 vol% fibres, modulus of the carbon fibres is 340 GPa and modulus of epoxy is 3.2 GPa, determine the modulus of the composite. Use this equation to calculate the modulus of the composite:

A composite containing carbon fibres in epoxy resin is loaded in a direction perpendicular to the reinforcing fibres. If there is 30 vol% fibres, modulus of the carbon fibres is 260 GPa and modulus of epoxy is 2.4 GPa, determine the modulus of the composite. Use this equation to calculate the modulus of the composite:

3.4 GPa

6.9 GPa

7.0 GPa

4.3 GPa

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A composite containing carbon fibres in epoxy resin is loaded in a direction parallel to the reinforcing fibres. If there is 40 vol% fibres, modulus of the carbon fibres is 280 GPa and modulus of epoxy is 2.6 GPa, determine the modulus of the composite. Use this equation to calculate the modulus of the composite:

181 GPa

80 GPa

114 GPa

188 GPa

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A student carrying out the aspirin synthesis as described in the lab manual started with 1.88 g of salicylic acid and reacted it with 2.5 mL of acetic anhydride (density = 1.082 g/mL) and 5 drops of 18 M sulfuric acid. What is their expected (theoretical) yield of aspirin?

A student carrying out the aspirin synthesis as described in the lab manual started with 1.89 g of salicylic acid and reacted it with 2.5 mL of acetic anhydride (density = 1.082 g/mL) and 5 drops of 18 M sulfuric acid. What is their expected (theoretical) yield of aspirin?

A student carrying out the aspirin synthesis as described in the lab manual started with 1.92 g of salicylic acid and reacted it with 2.5 mL of acetic anhydride (density = 1.082 g/mL) and 5 drops of 18 M sulfuric acid. What is their expected (theoretical) yield of aspirin?

What steps do you take in order to finish a vacuum filtration?

Turn off the vacuum tap, then lift the rubber square.

❌

Lift the rubber square then turn off the vacuum tap.

✅

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