Suppose that you are selecting a material to be used for construction scaffoldin
ID: 2073490 • Letter: S
Question
Suppose that you are selecting a material to be used for construction scaffolding (http://bfy.tw/G0SO). You simplify the structure as cantilever beams loaded in bending. Suppose that you want to select a material that is light and stiff (ie. maximize the index
[E^(1/2)]/
). Suggest two candidate materials, using your engineering judgement and the following Ashby chart. Show your all your work and clearly justify your selection.
Steels Nialloys two 3 Young's modulus Density SiC Ti alloys Technical 1000 ceramics -B4C Al alloys W alloys Composites CFRP Cu alloys 9 100 Bamboo --Mg alloys Metals WoodGFRP //grai PMMA Polyester Lead allo 10 Natural PA Zinc alloys oncret Longitudinal wave speed -- PEEK PET materials Nontechnical 7 Wood ceramiCS 10 m/s Rigid polymer foams PTFE - Polymers Foams Šilicone elastomers EVA 103m/s- Cork PolyurethaneGuide lines for minimum mass design soprene Neoprene' Flexible polymer foams -Butyl rubber Elastomers MFA, 09 10 100 1000 10,000 Density (kg/m2)Explanation / Answer
The two engineeering materials that i can suggest are:
1. Wrought Iron - which is having young's modulus of 190Gpa and density 7400 to 7800kg/m3
2. Steel - Which is having 190-240Gpa and density of 7850kg/m3
These materials are having the good properties and cannot bend moe and also having the ore index number.
The properties of steel are:
Strength.
Toughness.
Ductility.
Weldability.
Durability.
And the properties of wrought Iron:
soft
ductile
magnetic
high elasticity and tensile strength
It can be heated and reheated and worked into various shapes.
Hence these are the best selection for the materials to bee added in the beam.
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