Topic 4.1 and 4.2

Which mechanical property is most relevant to pins such as the ones shown in the diagram below?

• Compressive strength

• Toughness

• Elasticity

• Density

Refer to the image of innovative footwear using smart material technology, where the sole of the shoe charges mobile devices when in use. Which smart material property releases an electrical discharge when deformed by the walking action of the user?

• Shape memory alloy

• Piezoelectricity

• Thermoelectricity

• Electro-rheostatic

Metal physical properties can be modified by:

• Alloying and Work hardening

• Work hardening and Tempering

• Alloying and Tempering

• Alloying, Work hardening, and Tempering

Refer to Figure 5, which shows an innovative footwear solution using smart material technology. The sole of the shoe charges mobile devices when in use. Which smart material property releases an electrical discharge when deformed by the walking action of the user?

• Shape memory alloy

• Piezoelectricity

• Thermoelectricity

• Electro-rheostatic

Why are some moulds for metals made out of super alloys?

• To decrease the cost of moulds

• To speed the cooling process

• To increase the metal flow inside the moulds

• To resist high temperatures

Describe fused deposition modelling (FDM).

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List two properties of smart materials that enable 4D printed structures to change shape.

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Describe the moulding process used to shape the fiberglass composite chair.

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Explain one reason why a physical scale model would be used in the development of the Roly Poly Chair.

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Explain the psychological function and the practical function of the Roly Poly chair.

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