Q12 (a) Differentiate between the “soft constraints" and “hard constraints". (b) You are required to analyse and select the suitable materials with a Young's modulus (E) less than 1 GPa and a performance index M = n²/E greater than M =1 x104 GPa'. Use and attach Figure Q12b with your answer.
Q12 (a) Differentiate between the “soft constraints" and “hard constraints". (b) You are required to analyse and select the suitable materials with a Young's modulus (E) less than 1 GPa and a performance index M = n²/E greater than M =1 x104 GPa'. Use and attach Figure Q12b with your answer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q12 (a)
Differentiate between the “soft constraints" and “hard constraints".
(b)
You are required to analyse and select the suitable materials with a Young's
modulus (E) less than 1 GPa and a performance index M = n²/Æ greater than M
=1 x104 GPa''. Use and attach Figure Q12b with your answer.
1000
4. Modulus-Strength
Metals and Polymers: Yield Strength
Ceramics and Glasses: Compressive
Strength Elastomers: Tear Strength
Composites: Tensile Strength
Clamin
Cermats
Engineering
Alloys
MFA 91
Bery
Cast o
Min. Energy
Storage per
Unit Volume
Yield before
100
C AloyA T Alys
Gasses Enginedting
Ceramics
Engineering
Composites
Cement A
Buckling
CFRP
Leminates
Conerete
GFRP
Lead
Ash
Oak
Pine
Porous
Ceramics
MEL
Eponies
PMMA
-ó.1
Be
Woods
Polyeste
Design
Guide
Lines
HOPE
Pine
to
Gran IE
Besa
Engiheering
Polymers
LDPE
Max Energy
Storage per
Unit Volume
Buckling
before Yield
0.1
Polymers
Eoams
Hard
Elasiomers
Stopie
0.01
0.1
1000
10,000
10
100
Strength a, (MPa)
Figure Q12b
Youngs Modulus, E (GPa)
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