1. Checking the “Stress Corrosion”
of S.pressure materials/vessels
by “Acoustic Emission” test.
Kittipong 4/1 No.3
Thonn 4/2 No.8
Sajit 4/2 No.11

3. 1 2

4. Is It the stress wave?

5. Stress wave.
Type of stress waves.
1.) Instant wave
2.) continuous wave

6. Caused of Stress waves were made by
stress of S.pressure materials/vessels.

7. Stress corrosion in stainless steel.

8. The stress in stainless steel was generally made from
breaking passive film on the stainless steel skins.
Elasticity graph(over Hooke’s Law)

9. 1.Ferritic grade
2.Austenitic grade
3.Duplex grade
4.Martensitic grade
5.Precipitation-hardening grade

10. How do we get the data from the AE sensor?
(aesensors.co.uk)

11. Collecting signal data.

13. Find origin of stress corrosion wave
with double AE Sensor.
If variable d was the displacement from stress
corrosion wave origin to the right hand side.
The equation to calculate the situation was
“𝑑 =
𝐷−𝑣∆𝑡
2
”.
(this equation was made by linear motion.)

14. Reference
1.)substech.com
2.)met-engineering.blogspot.com
3.)aesensors.co.uk
4.)th.wikipedia.org/wiki/เหล็กกล้าไร้สนิม
5.) นายสินชัย บริบูรณ์สกุลสุข .การเฝ้ าสังเกตการณ์กัดกร่อนเชิงความเค้นของวัสดุ
ที่ใช้ทาภาชนะรับความดันโดยวิธีการปล่อยคลื่น อะคูสติก .
กรุงเทพ:จุฬาลงกรณ์มหาวิทยาลัย 2549.

15. Thanks for
your attention….