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Contents
1.What is Metal Fatigue?
2.Does Metal Fatigue often happen?
3.What we learn from the big accidents in the past
4.Recent trend “Giga-cycle fatigue”
5.How is fatigue testing operated?
6.What is S-N curve?
7.How to utilize S-N curve?
8.What happens in the longer life regime?



papers
GIGA QUAD

6.What is S-N curve?

Talk about Dual Rotating Bending Fatigue Testing Machine -Contents-
  1.What is Metal Fatigue?
  2.Does Metal Fatigue often happen?
  3.What we learn from the big accidents in the past
  4.Recent trend “Giga-cycle fatigue”
  5.How is fatigue testing operated?
  6.What is S-N curve?
  7.How to utilize S-N curve?
  8.What happens in the longer life regime?
S of S-N curve stands for "Stress". That means repeatitive load.
N stands for "Number of cycles to failure".
S describes a vertical axis and N describes a cross axis. Those make a graph below.
Fatigue limit
The graph mentioned above is an example of S-N curve.
The lins is downward-sloping. We can see from this graph that the more the number of cycles becomes,
The smaller stress even causes fatigue fracture.
However, we can find one line that it won't fracture by getting a load on unlimitedly
as long as the load is one constant repeatitive stress.
It is called Fatigue Limit.

These are some new theories as follows these days and the research of them has been proceeded.
"Is the fatigue limit which appeared until 107 times real one? "
"Fatigue fracture might actually happen if the test is continued to Giga-cycle regime,that is , further than conventuional regime.
Several cases have been found to fracture.
Do you want to create a S-N curve for a given material?

Different from the common metal specimen testing machine, our GIGA QUAD® can do fatigue tests for 4 specimens simultaneously under various environmental conditions (such as Corrosion environment, High temperature environment, etc.) with high efficiency.

For details, you can see how our GIGA QUAD® operates here:
For GIGA QUAD® Research Papers: Here
Talk about Dual Rotating Bending Fatigue Testing Machine -Contents-
  1.What is Metal Fatigue?
  2.Does Metal Fatigue often happen?
  3.What we learn from the big accidents in the past
  4.Recent trend “Giga-cycle fatigue”
  5.How is fatigue testing operated?
  6.What is S-N curve?
  7.How to utilize S-N curve?
  8.What happens in the longer life regime?
GIGA  QUAD series Dual-spindle rotating bending fatigue  testing machine
>> Contents



YAMAMOTO METAL TECHNOS CO., LTD.
Rotating Bending Fatigue Testing Machine [Japan]

4-7, Setoguchi 2-chome, Hirano-ku, 547-0034 Osaka Japan
TEL: 81-6-6704-1800 E-mail: info@yama-kin.co.jp


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