Improve Fatigue Life with Shot Peening: Compressive Stress Benefits

Click For Summary
SUMMARY

Shot peening significantly enhances fatigue life by inducing compressive surface stresses that counteract tensile stresses during cyclic loading. This process is crucial for materials with high elastic moduli, as they exhibit improved resistance to creep due to their atomic structure and grain size. The discussion emphasizes the relationship between material properties, such as grain size and elastic modulus, and their impact on fatigue and creep mechanisms. Understanding these concepts is essential for optimizing material performance in engineering applications.

PREREQUISITES
  • Shot peening techniques and their effects on material properties
  • Understanding of fatigue and stress states in materials
  • Knowledge of elastic modulus and its role in material stiffness
  • Familiarity with creep mechanisms, including Coble creep
NEXT STEPS
  • Research the principles of shot peening and its applications in engineering
  • Study the relationship between grain size and fatigue resistance in metals
  • Explore the atomic mechanisms of creep and the effects of high elastic moduli
  • Investigate advanced materials that exhibit enhanced fatigue life through surface treatments
USEFUL FOR

Materials engineers, mechanical engineers, and researchers focused on improving the durability and performance of structural components through surface treatment techniques.

zewei1988
Messages
21
Reaction score
0
How does shot peening help improve fatigue life, or rather, how does the compressive surface stress imposed help improve fatigue life?

How does materials having high elastic moduli and large grain size prevent creep?
 
Engineering news on Phys.org
We won't just give you the answers to homework-type questions at PF (that way nobody would learn anything), but if you give proposed answers and try to justify them, you'll likely get comments.
 
It's not a homework question, but I have no idea of how to prove it to you. It's something that was mentioned in my notes, and I tried checking Wikipedia and my recommended textbook, but I still do not understand those two points.
 
Let me try answering this way...

zewei1988 said:
How does shot peening help improve fatigue life, or rather, how does the compressive surface stress imposed help improve fatigue life?

What is fatigue, and what stress state does it involve?

zewei1988 said:
How does materials having high elastic moduli and large grain size prevent creep?

What is the atomic mechanism of creep? How might this mechanism be affected when the atoms are more strongly bound (which is how materials acquire high stiffness, or elastic modulus), or when there are fewer grain boundaries (look up Coble creep)?
 

Similar threads

Fatigue life hand calculations based on static FEA results
  • · Replies 4 ·
Replies
4
Views
2K
How to calculate fatigue life in the creep realm?
  • · Replies 8 ·
Replies
8
Views
4K
Fatigue of a Rotor: Predicting Life Expectancy with Variable Cyclic Stresses
  • · Replies 2 ·
Replies
2
Views
2K
Shear stress damage due to thermal gradient
  • · Replies 6 ·
Replies
6
Views
3K
What is the maximum mean stress in a bolted joint?
  • · Replies 12 ·
Replies
12
Views
14K
Wind-Induced Bending Stress on Chimney with Rectangular Cross-Section
  • · Replies 2 ·
Replies
2
Views
2K
I need help, please, designing a pool sensor for breaking . . .
  • · Replies 2 ·
Replies
2
Views
755
Misc. Bicycle Design (Individual Project)
  • · Replies 10 ·
Replies
10
Views
4K
How does a viscoelastic brake mechanism work for satellite deployment systems?
  • · Replies 9 ·
Replies
9
Views
3K
Internal stresses of an accelerating body
  • · Replies 11 ·
Replies
11
Views
3K