Technical InformationFatigue Test
Fatigue characteristics under constant stress
Flexural Strength Test by Plane Bending
(1) Purpose
Determine the fatigue limit when subjected to repeated constant stress
(2) Test conditions
| Test item | Simple beam/free testing method |
|---|---|
| Testing method | As per JIS K7119 |
| Sample shape | JIS K7119 Type-I (4 mmt) |
| Frequency | 30 Hz (1,800 cpm) |
| Temperature | 23℃ |
| Number of repetitions | Up to 10^7 times |
| Test Machine | Repeated Vibration Fatigue Tester–Model B70 (Toyo Seiki Seisaku-sho, Ltd.) |
(3) Result
The S-N curve for the test is shown below.
If the repeated stress is less than or equal to 1/4 of the maximum flexural strength, the product should be able to withstand at least 10^6 cycles.
