1) Use the information presented in the figure below (Ashby’s plot), answer the
ID: 2086544 • Letter: 1
Question
1) Use the information presented in the figure below (Ashby’s plot), answer the following questions:
A. Choose three examples of materials that can be used for the structural components of a underwater vehicle that requires a minimum strength of 600Mpa.
B. Following question a., what if the cost of the material of your choice need to be as low as possible. Which of the three that you’ve just picked would you choose?
C. Now consider the same structural component will be used in a space vehicle instead, and that cost is no longer an issue. What material would you choose to make the component out of?
10,000 Ceramics Strength Density Si3N Ti alloys Steels Metals Composites Ni alloys Metals and polymers: yield strength, ?y Ceramics, glasses: modulus of rupture, MOR Elastomers: tensile tear strength Composites: tensile failure, Tungsten alloys Al alloys CFRP Mg alloys GFRP Polymers and elastomers Tungsten carbide PEEK PA PC Copper alloys 100 Natural Woods, II PMMA materials 2 PE Rigid polymer foams S, Zinc alloys Lead alloys. Foams Concrete Butyl rubber Silicone elastomers -- Guide lines for minimum mass design Cork 2/3 Flexible polymer foams p o MFA, 09 10 100 1000 10,000 Density p (kg/m3)Explanation / Answer
Materials that can be used for structural components of underwater vehicle are:
CFRP
Silicon nitride
Steel
(b) Among all three steel is the cheapest and has also good tensile strength. So steel will be more preferable as compared to other two materials.
(c) For spacecraft vehicle composite is the suitable material for making structural component. In design of spacecraft vehicle,high specific strength and stiffness are required parameters. Thus composites fall under the category of required parameters.
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