Answered: A student conducted an experiment to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

A student conducted an experiment to determine the behavior of poly (ethylene) and poly (tetrafluo-
roethylene) to stress. The tables below depict the results of his experiments.

Part 1.1
Plot the stress-strain curves for both types of material. Calculate their respective Young’s moduli (E). How
do they compare?

Part 1.2
From their respective plots, determine their approximate strain energy before plastic deformation begins.
How do they compare?

Part 1.3
What do these calculations of young’s modulus and strain energy tell us about the properties of both
materials? Compare the properties of both materials using these calculations.

Poly(ethylene)
Stress (MPa) Strain
20
50
100
250
400
550
800
950
1,100
1,150
1,170
1,185
0.022
0.056
0.111
0.278
0.444
0.611
0.941
1.167
1.667
2.111
2.412
2.712
Poly(tetrafluoroethylene)
Stress (MPa)
20
50
100
250
400
550
800
950
1,100
1,150
1,190
1,200
Strain
0.033
0.083
0.167
0.417
0.667
0.917
1.510
1.950
2.433
3.011
3.502
4.000

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