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Engineering Materials Technology, 2nd Edition
book

Engineering Materials Technology, 2nd Edition

by William Bolton
October 2013
Intermediate to advanced content levelIntermediate to advanced
468 pages
20h 15m
English
Newnes
Content preview from Engineering Materials Technology, 2nd Edition
Fatigue 145
be large enough to melt the plastic. To avoid this, fatigue tests are normally
carried out with lower-frequency alternating stresses than is usual with metals.
The results of such tests, however, are not entirely valid if the alternating
stresses experienced by the plastic component in service are higher than those
used for the test.
Cu
o
M
60
r
E
| 40
1
20
"a
I °
S 10
2
10
3
10
4
10
5
10
6
10
7
^ Number of cycles
Figure 7.14 S/N graph for unplasticized PVC, alternating stress being a square
waveform at frequency 0.5 Hz
Figure 7.14 shows an S/N graph for a plastic, unplasticized PVC. The
alternating stresses were applied with a squar
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Publisher Resources

ISBN: 9781483141077