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PC
First Edition: Sep. 2025 01-00917-EN
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Fatigue Test Results
Table 5 shows the fatigue test conditions. Six conditions were
set for the maximum loading stress in the fatigue tests: from 20
to 70 % of the ultimate tensile strength in the static test results.
Fig. 4 shows the relationship between the maximum loading
stress and the specimen temperature. This time, the test was
conducted with the frequency determined so that the surface
temperature was 30 °C or less. Although the surface
temperature of the specimen increased as the maximum
loading stress increased, it can be confirmed from Fig. 4 that the
tests were conducted at 30 °C or less. Fig. 5 shows the
relationship between the maximum loading stress and the
number of cycles to failure (S-N diagram). In this article, S-N
diagrams were obtained for two types of materials and it was
possible to evaluate their fatigue properties.
Conclusion
In these tests, rigid PVC and PC were subjected to fatigue tests
in accordance with JIS K 7118 using the dynamic fatigue testing
machine Servopulser EHF-L. The surface temperature of the
specimens was measured using a radiation thermometer.
As described above, this instrument configuration can be used
for fatigue characterization of plastic materials.
<References>
1) Takeshi Kunio: Materials System, 6 (1987), 7-19
Maximum Loading Stress: The percentages of static ultimate tensile
strength were as follows
PVC 20, 30, 40, 50, 60 %
PC 20, 30, 40, 50, 60, 70 %
Stress Ratio: 0.1
Maximum Cycles: 1.0 × 10
6
Cycles
Frequency: 5 Hz
Number of Specimens: n = 2
Test Temperature: 23 °C
Table 2 Fatigue Test Conditions
0
10
20
30
40
50
60
70
0 10 20 30
Stress [MPa]
Strain [%]
0
10
20
30
40
50
60
70
80
0 2 4 6 8
Stress [MPa]
Strain [%]
20
21
22
23
24
25
26
27
28
29
30
20 30 40 50
Surface Temperature of Specimen [°C]
Maximum Loading Stress [MPa]
20
22
24
26
28
30
10 20 30 40 50
Surface Temperature of Specimen [°C]
Maximum Loading Stress [MPa]
0
10
20
30
40
50
60
70
80
1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Maximum Loading Stress [MPa]
Number of Cycles to Failure
2 points
0
10
20
30
40
50
60
70
80
1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
Maximum Loading Stress [MPa]
Number of Cycles to Failure
(a)
(b)
(a)
(b)
Rigid PVC
PC
Fig. 3 Stress-Strain Curves (a) Rigid PVC, (b) PC
Rigid PVC
PC
Rigid PVC
Fig. 5 S-N Diagram (a) Rigid PVC, (b) PC
Fig. 4 Surface Temperature of Specimen-Maximum Load Stress Curves
(a) Rigid PVC, (b) PC
(a)
(b)
