How does the hardness of ceramics, metals and polymers compare?

material science :need in 2 hours

  1. Draw a bubble chart in Metric units showing tensile strength on X-axis and hardness (HV) on Y-axis. How does the hardness of ceramics, metals and polymers compare? Do you see any correlation between tensile strength and hardness? If yes, describe it in words.



  1. Find materials where the following property requirements are met simultaneously:

(a) Minimum hardness of 300 HV

(b) Fracture toughness in excess of 100 MPa (m)0.5

(c) % Elongation no less than 20%

List density and cost of these materials in metric units.



3 Draw a bubble chart with density as X-axis and elastic limit as Y-axis in metric units. Using limit and intersect functions show the materials on the bubble chart that meet the following characteristics simultaneously:

(a) Production energy no higher that 25 MJ/kg

(b) CO2 production limited to 2 kg/kg

(c) Recyclable materials

Edit this bubble chart by changing the Y-axis to price. Which of the above materials is the cheapest? Which is the most expensive?




  1. A material is required for tire wheels. Documents what you would judge to be the design-limiting properties. Name three candidate materials and reasons.


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