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142 Chapter 4 Mechanical Testing: Tension Test and Other Basic Tests
12
80
Nylon 101
60
8
σ, Stress, MPa 40 σ, ksi
4
20 High-density polyethylene (HDPE)
Teflon (PTFE)
0
0 0.5 1.0 1.5 2.0 2.5
ε, Strain
Figure 4.16 Engineering stress–strain curves from tension tests on three polymers.
50
Pure copper
300 40
σ , Ult. Tensile Strength, MPa 200 Room temperature 30 σ , ksi u
200 C
o
20
o
400 C
600 C
o
100
u
800 C o 10
o
1000 C
0 0
10 -6 10 -4 10 -2 1 10 2 10 4
.
ε, Strain Rate, 1/s
Figure 4.17 Effect of strain rate on the ultimate tensile strength of copper for tests
at various temperatures. (Adapted from [Nadai 41]; used with permission of ASME.)
