Unusual Crack Growth Behavior in Engineering Alloys
Author Information
Author(s): Kujawski Daniel, Vasudevan Asuri K.
Primary Institution: Western Michigan University
Hypothesis
What causes the unexpected behavior of long cracks in certain alloys at low stress intensity factor ranges?
Conclusion
Some engineering alloys exhibit unexpected acceleration in fatigue crack growth rates at low stress intensity factors, challenging traditional fracture mechanics assumptions.
Supporting Evidence
- Unusual fatigue crack growth behavior was first reported in the IMI 834 alloy.
- Some alloys do not show a consistent decrease in crack growth rate with decreasing stress intensity.
- The Marci effect indicates that long cracks can grow at low stress intensity factors, challenging traditional design assumptions.
Takeaway
Some materials can grow cracks faster than expected when they are under low stress, which can be dangerous for structures like bridges and airplanes.
Methodology
The study involved analyzing fatigue crack growth behavior in various alloys under controlled stress intensity conditions.
Limitations
The mechanisms behind the observed anomalies are not fully understood and may not be applicable to all materials.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website