Fatigue and determination of life in the metal support structure of pressure vessels?

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Kristaq Hazizi

Conducting an earthquake-induced fatigue study on the metal supports of pressure vessels is an important aspect of ensuring their structural stability. The following are some steps that can be taken to determine the fatigue life of the metal support structure:

Determine the loading conditions: The first step is to identify the loading conditions that the metal supports are subjected to during an earthquake. This includes the amplitude, frequency, and duration of the loading.

Determine the stress range: Using the loading conditions, the stress range can be calculated using analytical or numerical methods. The stress range is the difference between the maximum and minimum stresses in the metal support structure during the loading cycle.

Material properties: The fatigue life of the metal support structure depends on the material properties of the metal. This includes the yield strength, ultimate strength, and fatigue strength. It is important to obtain accurate material properties through testing or by using data from reliable sources.

Fatigue analysis: Using the stress range and material properties, a fatigue analysis can be performed to determine the number of loading cycles that the metal supports can sustain before failure. This can be done using empirical fatigue life prediction models, such as the S-N curve approach.

Validation and verification: It is important to validate and verify the results of the fatigue analysis through experimental testing or comparison with data from previous studies.

Maintenance and monitoring: Finally, it is important to establish a maintenance and monitoring program to ensure the long-term structural integrity of the metal support structure. This includes periodic inspections and repairs or replacement of damaged or worn components.

In summary, determining the fatigue life of metal support structures in pressure vessels requires a thorough understanding of the loading conditions, material properties, and analytical methods for fatigue analysis. By following these steps, it is possible to ensure the structural stability of pressure vessels under earthquake-induced loading.

Bart Kemper

Classic fatigue is below yield but above the endurance limit. What you are looking at is short-cycle fatigue or cycle failure -- stress near or above yield that would fail in the relatively few (less than 10,000) cycles. Add to this, you are also looking at the contribution of buckling. You need to be clear in your objectives and whether it's applicable to earthquake-resistant designs or not.