Literature regarding appearence of cracks. Thermal, pressure fatigue

In summary, the conversation was about requesting recommendations for literature on the relationship between the appearance of a crack in thin metal and pressure fatigue or thermal fatigue. The person also asked if there are any visual signs that could indicate the cause of the crack, and if other possible causes have been eliminated. The other person recommended checking out case histories in the book "Engineering Materials" for more information on fatigue.
  • #1
ladil
12
0
Hello!

I am wondering if anyone could recommend som literature for me to get my hands on.
If there is any literature regarding how the appereance of a crack in a piece of thin metal (~0,4mm - 1mm) could be related to pressure fatigue or thermal fatigue.
Does the crack due to thermal fatigue have a specific appereance and so on. I need get my hands on practical pictures and so on, not equations.
Are there any signs in the vicinity of the crack that is indicating that this could be due to pressure fatigue.

Any help is much appreciated.

Thanks

Daniel

Online
 
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  • #2
What makes you think the crack that has appeared is due to fatigue?

For a material to fatigue it has to be subject to a significant number of stress reversals.

Failure analysis is a specialist field in which it is vital to gather (and present if others are to help) all the information you can.

Have you eliminated other possible causes, particularly a ltent defect or residual stresses.

You will find lots of failure analysis case histories in Vol3 of

Engineering Materials by Ashby & Jones

You will also need Vol1 to cover fatigue formally.
 
Last edited:
  • #3
Thank you for your answer.

I know it is fatigue, possible a combination of thermal and pressure fatigue. I would like to know if you could study the crack visually and make some conclusions.
I know that you could see striations with a SEM and so on.

I will check those books.
Thanks
 

FAQ: Literature regarding appearence of cracks. Thermal, pressure fatigue

1. What is the cause of cracks in materials?

The appearance of cracks in materials is usually caused by a combination of factors, including thermal stress, pressure fatigue, and material defects. Thermal stress is caused by differences in temperature, which can lead to expansion and contraction of the material. Pressure fatigue is the result of repeated loading and unloading of the material, causing it to weaken over time. Material defects, such as impurities or voids, can also contribute to the formation of cracks.

2. How do cracks affect the lifespan of materials?

Cracks can significantly reduce the lifespan of materials, as they can weaken the structural integrity of the material. They can also act as stress concentrators, making the material more susceptible to failure. In extreme cases, cracks can lead to catastrophic failure of the material.

3. Can cracks be prevented?

While it is difficult to completely prevent the appearance of cracks in materials, there are measures that can be taken to minimize their occurrence. This includes using materials with higher strength and toughness, avoiding excess thermal stress and pressure fatigue, and conducting regular inspections and maintenance to identify and address any potential cracks.

4. How can cracks be detected and measured?

Cracks can be detected through various non-destructive testing methods, such as ultrasonic testing and X-ray imaging. These methods can also be used to measure the size and depth of cracks. Other techniques, such as visual inspection and dye penetrant testing, can also be used to identify cracks on the surface of a material.

5. What are the implications of cracks in industrial applications?

Cracks in industrial applications can have serious implications, as they can compromise the safety and reliability of structures and equipment. In industries such as aerospace and automotive, cracks can lead to costly repairs and downtime, as well as potential hazards for workers. It is crucial for industries to closely monitor for and address any cracks to ensure the integrity of their materials and products.

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